{ "instance": { "wrk-10q_20190630.htm": { "axisCustom": 0, "axisStandard": 30, "contextCount": 486, "dts": { "calculationLink": { "local": [ "wrk-20190630_cal.xml" ] }, "definitionLink": { "local": [ "wrk-20190630_def.xml" ], "remote": [ "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-eedm-def-2018-01-31.xml", "http://xbrl.fasb.org/srt/2018/elts/srt-eedm1-def-2018-01-31.xml" ] }, "inline": { "local": [ "wrk-10q_20190630.htm" ] }, "labelLink": { "local": [ "wrk-20190630_lab.xml" ], "remote": [ "https://xbrl.sec.gov/invest/2013/invest-doc-2013-01-31.xml", "https://xbrl.sec.gov/dei/2018/dei-doc-2018-01-31.xml", "http://xbrl.fasb.org/srt/2018/elts/srt-doc-2018-01-31.xml", "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-doc-2018-01-31.xml" ] }, "presentationLink": { "local": [ "wrk-20190630_pre.xml" ] }, "referenceLink": { "remote": [ "http://xbrl.fasb.org/srt/2018/elts/srt-ref-2018-01-31.xml", "https://xbrl.sec.gov/invest/2013/invest-ref-2013-01-31.xml", "https://xbrl.sec.gov/dei/2018/dei-ref-2018-01-31.xml", "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-ref-2018-01-31.xml" ] }, "schema": { "local": [ "wrk-20190630.xsd" ], "remote": [ "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd", "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd", "http://www.xbrl.org/2003/xl-2003-12-31.xsd", "http://www.xbrl.org/2003/xlink-2003-12-31.xsd", "http://www.xbrl.org/2005/xbrldt-2005.xsd", "https://xbrl.sec.gov/dei/2018/dei-2018-01-31.xsd", "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd", "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-roles-2018-01-31.xsd", "http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd", "http://www.xbrl.org/2006/ref-2006-02-27.xsd", "http://xbrl.fasb.org/srt/2018/elts/srt-types-2018-01-31.xsd", "http://xbrl.fasb.org/srt/2018/elts/srt-roles-2018-01-31.xsd", "http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-types-2018-01-31.xsd", "https://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd", "https://xbrl.sec.gov/exch/2018/exch-2018-01-31.xsd", "https://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd", "https://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd", "https://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd", "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd", "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-parts-codification-2018-01-31.xsd" ] } }, "elementCount": 668, "entityCount": 1, "hidden": { "http://fasb.org/us-gaap/2018-01-31": 15, "http://www.westrock.com/20190630": 1, "http://xbrl.sec.gov/dei/2018-01-31": 13, "total": 29 }, "keyCustom": 118, "keyStandard": 352, "memberCustom": 48, "memberStandard": 54, "nsprefix": "wrk", "nsuri": "http://www.westrock.com/20190630", "report": { "R1": { "firstAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "document", "isDefault": "true", "longName": "100000 - Document - Document and Entity Information", "role": "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation", "shortName": "Document and Entity Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R10": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100090 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical 1)", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical 1)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "lang": null, "name": "wrk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCashPaidNetofCashAcquired", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R11": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100100 - Disclosure - Basis of Presentation and Significant Accounting Policies", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPolicies", "shortName": "Basis of Presentation and Significant Accounting Policies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R12": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RevenueFromContractWithCustomerTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100110 - Disclosure - Revenue Recognition", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognition", "shortName": "Revenue Recognition", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:RevenueFromContractWithCustomerTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R13": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BusinessCombinationDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100120 - Disclosure - Acquisitions", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitions", "shortName": "Acquisitions", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BusinessCombinationDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R14": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100130 - Disclosure - Restructuring and Other Costs", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCosts", "shortName": "Restructuring and Other Costs", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R15": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100140 - Disclosure - Retirement Plans", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlans", "shortName": "Retirement Plans", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R16": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100150 - Disclosure - Income Taxes", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxes", "shortName": "Income Taxes", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:IncomeTaxDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R17": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SegmentReportingDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100160 - Disclosure - Segment Information", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformation", "shortName": "Segment Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SegmentReportingDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R18": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InventoryDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100170 - Disclosure - Inventories", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventories", "shortName": "Inventories", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:InventoryDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R19": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:AssetsHeldForSaleTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100180 - Disclosure - Assets Held For Sale", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSale", "shortName": "Assets Held For Sale", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:AssetsHeldForSaleTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R2": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100010 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF INCOME", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "INF", "lang": null, "name": "us-gaap:CommonStockDividendsPerShareCashPaid", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" } }, "R20": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100190 - Disclosure - Property, Plant and Equipment", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipment", "shortName": "Property, Plant and Equipment", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R21": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100200 - Disclosure - Fair Value", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValue", "shortName": "Fair Value", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R22": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DebtDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100210 - Disclosure - Debt", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebt", "shortName": "Debt", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DebtDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R23": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "srt:CondensedFinancialStatementsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100220 - Disclosure - Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantors", "shortName": "Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "srt:CondensedFinancialStatementsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R24": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100230 - Disclosure - Commitments and Contingencies", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingencies", "shortName": "Commitments and Contingencies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R25": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100240 - Disclosure - Equity and Other Comprehensive Income (Loss)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLoss", "shortName": "Equity and Other Comprehensive Income (Loss)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R26": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100250 - Disclosure - Earnings Per Share", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShare", "shortName": "Earnings Per Share", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R27": { "firstAnchor": { "ancestors": [ "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100260 - Disclosure - Basis of Presentation and Significant Accounting Policies (Policies)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesPolicies", "shortName": "Basis of Presentation and Significant Accounting Policies (Policies)", "subGroupType": "policies", "uniqueAnchor": { "ancestors": [ "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R28": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisaggregationOfRevenueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100270 - Disclosure - Revenue Recognition (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables", "shortName": "Revenue Recognition (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisaggregationOfRevenueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R29": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapBusinessAcquisitionAxis_wrkKapStoneAcquisitionMember_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100280 - Disclosure - Acquisitions (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables", "shortName": "Acquisitions (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapBusinessAcquisitionAxis_wrkKapStoneAcquisitionMember_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R3": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100020 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R30": { "firstAnchor": { "ancestors": [ "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100290 - Disclosure - Restructuring and Other Costs (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsTables", "shortName": "Restructuring and Other Costs (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R31": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100300 - Disclosure - Retirement Plans (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansTables", "shortName": "Retirement Plans (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R32": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SummaryOfIncomeTaxContingenciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100310 - Disclosure - Income Taxes (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesTables", "shortName": "Income Taxes (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SummaryOfIncomeTaxContingenciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R33": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100320 - Disclosure - Segment Information (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationTables", "shortName": "Segment Information (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R34": { "firstAnchor": { "ancestors": [ "us-gaap:InventoryDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100330 - Disclosure - Inventories (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesTables", "shortName": "Inventories (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:InventoryDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfInventoryCurrentTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R35": { "firstAnchor": { "ancestors": [ "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100340 - Disclosure - Property, Plant and Equipment (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentTables", "shortName": "Property, Plant and Equipment (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:PropertyPlantAndEquipmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R36": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueByBalanceSheetGroupingTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100350 - Disclosure - Fair Value (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueTables", "shortName": "Fair Value (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueByBalanceSheetGroupingTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R37": { "firstAnchor": { "ancestors": [ "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100360 - Disclosure - Debt (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtTables", "shortName": "Debt (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R38": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "srt:ScheduleOfCondensedIncomeStatementTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100370 - Disclosure - Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsTables", "shortName": "Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors (Tables)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "srt:ScheduleOfCondensedIncomeStatementTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R39": { "firstAnchor": { "ancestors": [ "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:AccumulatedOtherComprehensiveIncomeLossTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100380 - Disclosure - Equity and Other Comprehensive Income (Loss) (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossTables", "shortName": "Equity and Other Comprehensive Income (Loss) (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "wrk:AccumulatedOtherComprehensiveIncomeLossTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R4": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100030 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS", "shortName": "CONDENSED CONSOLIDATED BALANCE SHEETS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-6", "lang": null, "name": "us-gaap:PreferredStockValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R40": { "firstAnchor": { "ancestors": [ "p", "us-gaap:EarningsPerShareTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100390 - Disclosure - Earnings Per Share (Tables)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareTables", "shortName": "Earnings Per Share (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:EarningsPerShareTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R41": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100400 - Disclosure - Basis of Presentation and Significant Accounting Policies - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "shortName": "Basis of Presentation and Significant Accounting Policies - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "span", "p", "us-gaap:BasisOfAccountingPolicyPolicyTextBlock", "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_srtRestatementAxis_wrkDifferenceBetweenGuidanceInEffectBeforeAndAfterASU201707Member_us-gaapAdjustmentsForNewAccountingPronouncementsAxis_us-gaapAccountingStandardsUpdate201707Member_20180401_20180630", "decimals": "-5", "lang": null, "name": "us-gaap:NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R42": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100410 - Disclosure - Revenue Recognition - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "shortName": "Revenue Recognition - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": null, "lang": "en-US", "name": "us-gaap:RevenuePerformanceObligationSatisfiedAtPointInTimeTransferOfControl", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R43": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100420 - Disclosure - Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Statements of Income (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "shortName": "Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Statements of Income (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:RevenueFromContractWithCustomerTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapAdjustmentsForNewAccountingPronouncementsAxis_us-gaapAccountingStandardsUpdate201409Member_us-gaapInitialApplicationPeriodCumulativeEffectTransitionAxis_us-gaapCalculatedUnderRevenueGuidanceInEffectBeforeTopic606Member_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R44": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:InventoryNet", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100430 - Disclosure - Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Balance Sheet (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "shortName": "Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Balance Sheet (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:RevenueFromContractWithCustomerTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapAdjustmentsForNewAccountingPronouncementsAxis_us-gaapAccountingStandardsUpdate201409Member_us-gaapInitialApplicationPeriodCumulativeEffectTransitionAxis_us-gaapCalculatedUnderRevenueGuidanceInEffectBeforeTopic606Member_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:InventoryNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R45": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100440 - Disclosure - Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Statement of Cash Flows (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "shortName": "Revenue Recognition - Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Statement of Cash Flows (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapAdjustmentsForNewAccountingPronouncementsAxis_us-gaapAccountingStandardsUpdate201409Member_us-gaapInitialApplicationPeriodCumulativeEffectTransitionAxis_us-gaapCalculatedUnderRevenueGuidanceInEffectBeforeTopic606Member_20181001_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:IncreaseDecreaseInOtherOperatingAssets", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R46": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100450 - Disclosure - Revenue Recognition - Schedule of Disaggregate Revenue by Geographical Market and Product Type (Segment) (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "shortName": "Revenue Recognition - Schedule of Disaggregate Revenue by Geographical Market and Product Type (Segment) (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_srtStatementGeographicalAxis_srtNorthAmericaMember_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R47": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:ContractWithCustomerAssetNetCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100460 - Disclosure - Revenue Recognition - Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails", "shortName": "Revenue Recognition - Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:ContractWithCustomerAssetNetCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R48": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181102", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:CommonStockParOrStatedValuePerShare", "reportCount": 1, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100470 - Disclosure - Acquisitions - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "shortName": "Acquisitions - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181101_20181102", "decimals": "INF", "lang": null, "name": "wrk:SharesOfWRKCoRatioOfCommonStock", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R49": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:Goodwill", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100480 - Disclosure - Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed by Major of assets and Liabilities and Measurement Period Adjustments (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "shortName": "Acquisitions - Summary of Fair Values of Assets Acquired and Liabilities Assumed by Major of assets and Liabilities and Measurement Period Adjustments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapBusinessAcquisitionAxis_wrkKapStoneAcquisitionMember_20181102", "decimals": "-5", "lang": null, "name": "us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R5": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100040 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical", "shortName": "CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R50": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapBusinessAcquisitionAxis_wrkKapStoneAcquisitionMember_20181101_20181102", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:FinitelivedIntangibleAssetsAcquired1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100490 - Disclosure - Acquisitions - Summary of Weighted Average Life and Fair Value of Intangible Asset Recognized in KapStone Acquisition, Excluding Goodwill (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails", "shortName": "Acquisitions - Summary of Weighted Average Life and Fair Value of Intangible Asset Recognized in KapStone Acquisition, Excluding Goodwill (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapBusinessAcquisitionAxis_wrkKapStoneAcquisitionMember_20181101_20181102", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:FinitelivedIntangibleAssetsAcquired1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R51": { "firstAnchor": { "ancestors": [ "p", "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:RestructuringAndOtherCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100500 - Disclosure - Restructuring and Other Costs - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsAdditionalInformationDetails", "shortName": "Restructuring and Other Costs - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:RestructuringAndOtherCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R52": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "wrk:ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock", "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RestructuringAndRelatedCostIncurredCost", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100510 - Disclosure - Restructuring and Other Costs - Schedule of Restructuring and Other Costs (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringAndOtherCostsDetails", "shortName": "Restructuring and Other Costs - Schedule of Restructuring and Other Costs (Details)", "subGroupType": "details", "uniqueAnchor": null }, "R53": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "wrk:ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock", "wrk:RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RestructuringAndRelatedCostIncurredCost", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100520 - Disclosure - Restructuring and Other Costs - Schedule of Restructuring Charges Related to Active Restructuring Initiatives (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "shortName": "Restructuring and Other Costs - Schedule of Restructuring Charges Related to Active Restructuring Initiatives (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapRestructuringCostAndReserveAxis_wrkNetPropertyPlantAndEquipmentMember_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:RestructuringAndRelatedCostIncurredCost", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R54": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:BusinessCombinationAcquisitionRelatedCosts", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100530 - Disclosure - Restructuring and Other Costs - Schedule of Acquisition, Divestiture and Integration Costs (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "shortName": "Restructuring and Other Costs - Schedule of Acquisition, Divestiture and Integration Costs (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "wrk:ScheduleOfRestructuringCostsIncludedInOtherExpensesTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapStatementBusinessSegmentsAxis_us-gaapAllOtherSegmentsMember_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:BusinessCombinationAcquisitionRelatedCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R55": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "wrk:ScheduleOfRestructuringAndOtherCostsReserveByTypeOfCostTextBlockTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "wrk:RestructuringAndOtherCostsReserve", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100540 - Disclosure - Restructuring and Other Costs - Schedule of Changes in Restructuring Accrual Charges (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfChangesInRestructuringAccrualChargesDetails", "shortName": "Restructuring and Other Costs - Schedule of Changes in Restructuring Accrual Charges (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "wrk:ScheduleOfRestructuringAndOtherCostsReserveByTypeOfCostTextBlockTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "wrk:RestructuringAndOtherCostsReserve", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R56": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:AdditionalAccrualsAndAdjustmentsToAccruals", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100550 - Disclosure - Restructuring and Other Costs - Schedule of Reconciliation of Accruals and Charges (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails", "shortName": "Restructuring and Other Costs - Schedule of Reconciliation of Accruals and Charges (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:AdditionalAccrualsAndAdjustmentsToAccruals", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R57": { "firstAnchor": { "ancestors": [ "p", "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:MultiemployerPlansWithdrawalObligation", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100560 - Disclosure - Retirement Plans - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails", "shortName": "Retirement Plans - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "lang": null, "name": "us-gaap:MultiemployerPlansWithdrawalObligation", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R58": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:MultiEmployerPensionWithdrawal", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100570 - Disclosure - Retirement Plans - Summary of Components of Net Pension (Income) Cost and Summary of Components of Postretirement Benefit Cost (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails", "shortName": "Retirement Plans - Summary of Components of Net Pension (Income) Cost and Summary of Components of Postretirement Benefit Cost (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfNetBenefitCostsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapRetirementPlanTypeAxis_us-gaapPensionPlansDefinedBenefitMember_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:DefinedBenefitPlanServiceCost", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R59": { "firstAnchor": { "ancestors": [ "p", "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "3", "first": true, "lang": null, "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100590 - Disclosure - Income Taxes - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails", "shortName": "Income Taxes - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:IncomeTaxDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "3", "first": true, "lang": null, "name": "us-gaap:EffectiveIncomeTaxRateContinuingOperations", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R6": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapStatementEquityComponentsAxis_us-gaapCommonStockMember_20170930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:CommonStockSharesOutstanding", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF EQUITY", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF EQUITY", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapStatementEquityComponentsAxis_us-gaapCommonStockMember_20170930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:CommonStockSharesOutstanding", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R60": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:SummaryOfIncomeTaxContingenciesTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:UnrecognizedTaxBenefits", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100600 - Disclosure - Income Taxes - Summary of Changes in Reserve for Uncertain Tax Position (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails", "shortName": "Income Taxes - Summary of Changes in Reserve for Uncertain Tax Position (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:SummaryOfIncomeTaxContingenciesTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:UnrecognizedTaxBenefits", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R61": { "firstAnchor": { "ancestors": [ "p", "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:NumberOfReportableSegments", "reportCount": 1, "unique": true, "unitRef": "U_wrksegment", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100610 - Disclosure - Segment Information - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "shortName": "Segment Information - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:NumberOfReportableSegments", "reportCount": 1, "unique": true, "unitRef": "U_wrksegment", "xsiNil": "false" } }, "R62": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100620 - Disclosure - Segment Information - Certain Operating Data for Segments (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "shortName": "Segment Information - Certain Operating Data for Segments (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_srtConsolidationItemsAxis_us-gaapOperatingSegmentsMember_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R63": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfGoodwillTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:GoodwillGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100630 - Disclosure - Segment Information - Changes in Carrying Amount of Goodwill (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails", "shortName": "Segment Information - Changes in Carrying Amount of Goodwill (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfGoodwillTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:GoodwillGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R64": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfInventoryCurrentTableTextBlock", "us-gaap:InventoryDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:InventoryFinishedGoodsAndWorkInProcess", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100640 - Disclosure - Inventories - Schedule of Inventories (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails", "shortName": "Inventories - Schedule of Inventories (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfInventoryCurrentTableTextBlock", "us-gaap:InventoryDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:InventoryFinishedGoodsAndWorkInProcess", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R65": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100650 - Disclosure - Assets Held For Sale - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSaleAdditionalInformationDetails", "shortName": "Assets Held For Sale - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "wrk:AssetsHeldForSaleTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapIncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_wrkLandAndDevelopmentPortfolioAssetsMember_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R66": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:PropertyPlantAndEquipmentTextBlock", "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:PropertyPlantAndEquipmentGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100660 - Disclosure - Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails", "shortName": "Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:PropertyPlantAndEquipmentTextBlock", "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:PropertyPlantAndEquipmentGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R67": { "firstAnchor": { "ancestors": [ "p", "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190101_20190331", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:TangibleAssetImpairmentCharges", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100670 - Disclosure - Fair Value - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails", "shortName": "Fair Value - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180925", "decimals": "-5", "lang": null, "name": "wrk:MaximumEligibleReceivablesThatMayBeSold", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R68": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueByBalanceSheetGroupingTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20170930", "decimals": "-5", "first": true, "lang": null, "name": "wrk:ReceivableFromFinancialInstitutionCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100680 - Disclosure - Fair Value - Summary of Activity Under A/R Sales Agreement (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueSummaryOfActivityUnderARSalesAgreementDetails", "shortName": "Fair Value - Summary of Activity Under A/R Sales Agreement (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:FairValueByBalanceSheetGroupingTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20170930", "decimals": "-5", "first": true, "lang": null, "name": "wrk:ReceivableFromFinancialInstitutionCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R69": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:DebtLongtermAndShorttermCombinedAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100690 - Disclosure - Debt - Schedule of Carrying Value of Individual Components of Debt (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails", "shortName": "Debt - Schedule of Carrying Value of Individual Components of Debt (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:DebtLongtermAndShorttermCombinedAmount", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R7": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:CommonStockDividendsPerShareCashPaid", "reportCount": 1, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "link:footnote", "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapBusinessAcquisitionAxis_wrkKapStoneMember_20181001_20190630", "decimals": "-5", "lang": "en-US", "name": "us-gaap:BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R70": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-8", "first": true, "lang": null, "name": "us-gaap:DebtInstrumentFairValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100700 - Disclosure - Debt - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "shortName": "Debt - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-8", "lang": null, "name": "us-gaap:DebtInstrumentFairValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R71": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapDebtInstrumentAxis_wrkLongtermDebtExcludingCapitalLeaseObligationsMember_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100710 - Disclosure - Debt - Schedule of Aggregate Maturities of Debt (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "shortName": "Debt - Schedule of Aggregate Maturities of Debt (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapDebtInstrumentAxis_wrkLongtermDebtExcludingCapitalLeaseObligationsMember_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R72": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100720 - Disclosure - Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Statements of Income (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "shortName": "Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Statements of Income (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "srt:ScheduleOfCondensedIncomeStatementTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:PensionAndOtherPostretirementBenefitExpense", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R73": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100730 - Disclosure - Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Balance Sheets (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "shortName": "Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Balance Sheets (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "srt:ScheduleOfCondensedBalanceSheetTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_srtConsolidatedEntitiesAxis_srtParentCompanyMember_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:OtherAssetsCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R74": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:NetCashProvidedByUsedInOperatingActivities", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100740 - Disclosure - Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Statements of Cash Flows (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "shortName": "Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Condensed Consolidating Statements of Cash Flows (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "srt:ScheduleOfCondensedCashFlowStatementTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_srtConsolidatedEntitiesAxis_srtParentCompanyMember_20181001_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:NetCashProvidedByUsedInOperatingActivities", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R75": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_srtConsolidatedEntitiesAxis_srtParentCompanyMember_20181001_20190630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:IntercompanyReceivablesNoncashOperatingActivities", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100750 - Disclosure - Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Noncash Operating, Investing and Financing Activities (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails", "shortName": "Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors - Noncash Operating, Investing and Financing Activities (Details)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_srtConsolidatedEntitiesAxis_srtParentCompanyMember_20181001_20190630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:IntercompanyReceivablesNoncashOperatingActivities", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R76": { "firstAnchor": { "ancestors": [ "p", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AccrualForEnvironmentalLossContingencies", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100760 - Disclosure - Commitments and Contingencies - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails", "shortName": "Commitments and Contingencies - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AccrualForEnvironmentalLossContingencies", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R77": { "firstAnchor": { "ancestors": [ "p", "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20150701", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100770 - Disclosure - Equity and Other Comprehensive Income (Loss) - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "shortName": "Equity and Other Comprehensive Income (Loss) - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:StockholdersEquityNoteDisclosureTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20150701", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R78": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20180930", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100780 - Disclosure - Equity and Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails", "shortName": "Equity and Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20170930", "decimals": "-5", "lang": null, "name": "us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R79": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100790 - Disclosure - Equity and Other Comprehensive Income (Loss) - Summary of Reclassification out of Accumulated Other Comprehensive Loss (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails", "shortName": "Equity and Other Comprehensive Income (Loss) - Summary of Reclassification out of Accumulated Other Comprehensive Loss (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_us-gaapStatementEquityComponentsAxis_us-gaapParentMember_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R8": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100070 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20181001_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:DepreciationDepletionAndAmortization", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R80": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100800 - Disclosure - Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails", "shortName": "Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "us-gaap:EarningsPerShareTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20171001_20180630", "decimals": "-5", "lang": null, "name": "us-gaap:ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R81": { "firstAnchor": { "ancestors": [ "p", "us-gaap:EarningsPerShareTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100810 - Disclosure - Earnings Per Share - Additional Information (Details)", "role": "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareAdditionalInformationDetails", "shortName": "Earnings Per Share - Additional Information (Details)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:EarningsPerShareTextBlock", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R9": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20171001_20180630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:DeferredPurchasePriceOfTradeReceivablesSold", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100080 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)", "role": "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical", "shortName": "CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "wrk-10q_20190630.htm", "contextRef": "C_0001732845_20171001_20180630", "decimals": "-5", "first": true, "lang": null, "name": "wrk:DeferredPurchasePriceOfTradeReceivablesSold", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } } }, "segmentCount": 103, "tag": { "dei_AmendmentFlag": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "If the value is true, then the document is an amendment to previously-filed/accepted document.", "label": "Amendment Flag", "terseLabel": "Amendment Flag" } } }, "localname": "AmendmentFlag", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_CityAreaCode": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Area code of city", "label": "City Area Code", "terseLabel": "City Area Code" } } }, "localname": "CityAreaCode", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_CurrentFiscalYearEndDate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "End date of current fiscal year in the format --MM-DD.", "label": "Current Fiscal Year End Date", "terseLabel": "Current Fiscal Year End Date" } } }, "localname": "CurrentFiscalYearEndDate", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "gMonthDayItemType" }, "dei_DocumentFiscalPeriodFocus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY.", "label": "Document Fiscal Period Focus", "terseLabel": "Document Fiscal Period Focus" } } }, "localname": "DocumentFiscalPeriodFocus", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "fiscalPeriodItemType" }, "dei_DocumentFiscalYearFocus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.", "label": "Document Fiscal Year Focus", "terseLabel": "Document Fiscal Year Focus" } } }, "localname": "DocumentFiscalYearFocus", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "gYearItemType" }, "dei_DocumentPeriodEndDate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.", "label": "Document Period End Date", "terseLabel": "Document Period End Date" } } }, "localname": "DocumentPeriodEndDate", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "dateItemType" }, "dei_DocumentType": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.", "label": "Document Type", "terseLabel": "Document Type" } } }, "localname": "DocumentType", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "submissionTypeItemType" }, "dei_EntityAddressAddressLine1": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Address Line 1 such as Building Name, Street Name", "label": "Entity Address Address Line1", "terseLabel": "Entity Address, Address Line One" } } }, "localname": "EntityAddressAddressLine1", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressCityOrTown": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Name of the City or Town", "label": "Entity Address City Or Town", "terseLabel": "Entity Address, City or Town" } } }, "localname": "EntityAddressCityOrTown", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressPostalZipCode": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Code for the postal or zip code", "label": "Entity Address Postal Zip Code", "terseLabel": "Entity Address, Postal Zip Code" } } }, "localname": "EntityAddressPostalZipCode", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressStateOrProvince": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Name of the state or province.", "label": "Entity Address State Or Province", "terseLabel": "Entity Address, State or Province" } } }, "localname": "EntityAddressStateOrProvince", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityCentralIndexKey": { "auth_ref": [ "r405" ], "lang": { "en-US": { "role": { "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.", "label": "Entity Central Index Key", "terseLabel": "Entity Central Index Key" } } }, "localname": "EntityCentralIndexKey", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "centralIndexKeyItemType" }, "dei_EntityCommonStockSharesOutstanding": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.", "label": "Entity Common Stock Shares Outstanding", "terseLabel": "Entity Common Stock, Shares Outstanding" } } }, "localname": "EntityCommonStockSharesOutstanding", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "sharesItemType" }, "dei_EntityCurrentReportingStatus": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.", "label": "Entity Current Reporting Status", "terseLabel": "Entity Current Reporting Status" } } }, "localname": "EntityCurrentReportingStatus", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityEmergingGrowthCompany": { "auth_ref": [ "r405" ], "lang": { "en-US": { "role": { "documentation": "Indicate if registrant meets the emerging growth company criteria.", "label": "Entity Emerging Growth Company", "terseLabel": "Entity Emerging Growth Company" } } }, "localname": "EntityEmergingGrowthCompany", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityFileNumber": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.", "label": "Entity File Number", "terseLabel": "Entity File Number" } } }, "localname": "EntityFileNumber", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "fileNumberItemType" }, "dei_EntityFilerCategory": { "auth_ref": [ "r405" ], "lang": { "en-US": { "role": { "documentation": "Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, (4) Smaller Reporting Company (Non-accelerated), (5) Smaller Reporting Accelerated Filer or (6) Smaller Reporting Company and Large Accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.", "label": "Entity Filer Category", "terseLabel": "Entity Filer Category" } } }, "localname": "EntityFilerCategory", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "filerCategoryItemType" }, "dei_EntityRegistrantName": { "auth_ref": [ "r405" ], "lang": { "en-US": { "role": { "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.", "label": "Entity Registrant Name", "terseLabel": "Entity Registrant Name" } } }, "localname": "EntityRegistrantName", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityShellCompany": { "auth_ref": [ "r405" ], "lang": { "en-US": { "role": { "documentation": "Indicate if company meets the shell company criteria: a company with no or nominal operations, and with no or nominal assets or assets consisting solely of cash and cash equivalents.", "label": "Entity Shell Company", "terseLabel": "Entity Shell Company" } } }, "localname": "EntityShellCompany", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntitySmallBusiness": { "auth_ref": [ "r405" ], "lang": { "en-US": { "role": { "documentation": "Indicates that the company is a smaller reporting company with both a public float and revenues of less than $75 million.", "label": "Entity Small Business", "terseLabel": "Entity Small Business" } } }, "localname": "EntitySmallBusiness", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityTaxIdentificationNumber": { "auth_ref": [ "r405" ], "lang": { "en-US": { "role": { "documentation": "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.", "label": "Entity Tax Identification Number", "terseLabel": "Entity Tax Identification Number" } } }, "localname": "EntityTaxIdentificationNumber", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "nineDigitItemType" }, "dei_LocalPhoneNumber": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Local phone number for entity.", "label": "Local Phone Number", "terseLabel": "Local Phone Number" } } }, "localname": "LocalPhoneNumber", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_TradingSymbol": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Trading symbol of an instrument as listed on an exchange.", "label": "Trading Symbol", "terseLabel": "Trading Symbol" } } }, "localname": "TradingSymbol", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "invest_DerivativeNotionalAmount": { "auth_ref": [ "r406" ], "lang": { "en-US": { "role": { "documentation": "Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.", "label": "Derivative Notional Amount", "terseLabel": "Amount of foreign exchange contracts" } } }, "localname": "DerivativeNotionalAmount", "nsuri": "http://xbrl.sec.gov/invest/2013-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "srt_AsiaPacificMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Region of Asia Pacific.", "label": "Asia Pacific [Member]", "terseLabel": "Asia Pacific [Member]" } } }, "localname": "AsiaPacificMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails" ], "xbrltype": "domainItemType" }, "srt_CondensedBalanceSheetStatementTable": { "auth_ref": [ "r121", "r328", "r410" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations.", "label": "Condensed Balance Sheet Statement [Table]", "terseLabel": "Condensed Balance Sheet Statement [Table]" } } }, "localname": "CondensedBalanceSheetStatementTable", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedBalanceSheetStatementsCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Condensed Balance Sheet Statements Captions [Line Items]", "terseLabel": "Condensed Balance Sheet Statements Captions [Line Items]" } } }, "localname": "CondensedBalanceSheetStatementsCaptionsLineItems", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedCashFlowStatementTable": { "auth_ref": [ "r121", "r328", "r411" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about condensed cash flow statement, including, but not limited to, cash flow statements of consolidated entities and consolidation eliminations.", "label": "Condensed Cash Flow Statement [Table]", "terseLabel": "Condensed Cash Flow Statement [Table]" } } }, "localname": "CondensedCashFlowStatementTable", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedCashFlowStatementsCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Condensed Cash Flow Statements Captions [Line Items]", "terseLabel": "Condensed Cash Flow Statements Captions [Line Items]" } } }, "localname": "CondensedCashFlowStatementsCaptionsLineItems", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedFinancialStatementsTextBlock": { "auth_ref": [ "r121", "r411", "r412", "r415", "r416", "r417" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for condensed financial statements.", "label": "Condensed Financial Statements [Text Block]", "terseLabel": "Selected Condensed Consolidating Financial Statements of Parent, Issuer, Guarantors and Non-Guarantors" } } }, "localname": "CondensedFinancialStatementsTextBlock", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantors" ], "xbrltype": "textBlockItemType" }, "srt_CondensedIncomeStatementTable": { "auth_ref": [ "r121", "r328", "r411" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about condensed income statement including, but not limited to, income statements of consolidated entities and consolidation eliminations.", "label": "Condensed Income Statement [Table]", "terseLabel": "Condensed Income Statement [Table]" } } }, "localname": "CondensedIncomeStatementTable", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails" ], "xbrltype": "stringItemType" }, "srt_CondensedIncomeStatementsCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Condensed Income Statements Captions [Line Items]", "terseLabel": "Condensed Income Statements Captions [Line Items]" } } }, "localname": "CondensedIncomeStatementsCaptionsLineItems", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails" ], "xbrltype": "stringItemType" }, "srt_ConsolidatedEntitiesAxis": { "auth_ref": [ "r404", "r408" ], "lang": { "en-US": { "role": { "documentation": "Information by consolidated entity or group of entities.", "label": "Consolidated Entities [Axis]", "terseLabel": "Parent [Member]" } } }, "localname": "ConsolidatedEntitiesAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "stringItemType" }, "srt_ConsolidatedEntitiesDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Entity or group of entities consolidated into reporting entity.", "label": "Consolidated Entities [Domain]", "terseLabel": "Consolidated Entities" } } }, "localname": "ConsolidatedEntitiesDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "domainItemType" }, "srt_ConsolidationEliminationsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Eliminating entries used in consolidating a parent entity and its subsidiaries.", "label": "Consolidation Eliminations [Member]", "terseLabel": "Eliminations [Member]" } } }, "localname": "ConsolidationEliminationsMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "domainItemType" }, "srt_ConsolidationItemsAxis": { "auth_ref": [ "r150", "r157" ], "lang": { "en-US": { "role": { "documentation": "Information by components, eliminations, non-segment corporate-level activity and reconciling items used in consolidating a parent entity and its subsidiaries or its operating segments.", "label": "Consolidation Items [Axis]", "terseLabel": "Consolidation Items" } } }, "localname": "ConsolidationItemsAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "stringItemType" }, "srt_ConsolidationItemsDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Components, elimination, non-segment corporate-level activity and reconciling items used in consolidating a parent entity and its subsidiaries or its operating segments.", "label": "Consolidation Items [Domain]", "terseLabel": "Consolidation Items" } } }, "localname": "ConsolidationItemsDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "srt_EuropeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Continent of Europe.", "label": "Europe [Member]", "terseLabel": "Europe [Member]" } } }, "localname": "EuropeMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails" ], "xbrltype": "domainItemType" }, "srt_GuarantorSubsidiariesMember": { "auth_ref": [ "r223", "r413" ], "lang": { "en-US": { "role": { "documentation": "Entity owned or controlled by another entity which has guaranteed the issue of securities by another subsidiary of the parent or has guaranteed the issue of securities by the parent.", "label": "Guarantor Subsidiaries [Member]", "terseLabel": "Guarantor Subsidiaries [Member]" } } }, "localname": "GuarantorSubsidiariesMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "domainItemType" }, "srt_MajorCustomersAxis": { "auth_ref": [ "r161", "r250", "r254" ], "lang": { "en-US": { "role": { "documentation": "Information by name or description of a single external customer or a group of external customers.", "label": "Major Customers [Axis]", "terseLabel": "Customer" } } }, "localname": "MajorCustomersAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "stringItemType" }, "srt_MaximumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Upper limit of the provided range.", "label": "Maximum [Member]", "terseLabel": "Maximum [Member]" } } }, "localname": "MaximumMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_MinimumMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Lower limit of the provided range.", "label": "Minimum [Member]", "terseLabel": "Minimum [Member]" } } }, "localname": "MinimumMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_NameOfMajorCustomerDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Single external customer or group of external customers.", "label": "Name Of Major Customer [Domain]", "terseLabel": "Customer" } } }, "localname": "NameOfMajorCustomerDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "srt_NonGuarantorSubsidiariesMember": { "auth_ref": [ "r224", "r414" ], "lang": { "en-US": { "role": { "documentation": "Entity owned or controlled by another entity which has not guaranteed the issue of securities by another subsidiary of the parent or has not guaranteed the issue of securities by the parent.", "label": "Non Guarantor Subsidiaries [Member]", "terseLabel": "Non-Guarantor Subsidiaries [Member]" } } }, "localname": "NonGuarantorSubsidiariesMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "domainItemType" }, "srt_NorthAmericaMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Continent of North America.", "label": "North America [Member]", "terseLabel": "North America [Member]" } } }, "localname": "NorthAmericaMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails" ], "xbrltype": "domainItemType" }, "srt_ParentCompanyMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The registrant that controls, directly or indirectly, another entity (or entities). The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock. The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree.", "label": "Parent Company [Member]", "terseLabel": "Parent [Member]" } } }, "localname": "ParentCompanyMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "domainItemType" }, "srt_RangeAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by range, including, but not limited to, upper and lower bounds.", "label": "Range [Axis]", "terseLabel": "Range" } } }, "localname": "RangeAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "srt_RangeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Extent of variation, for example, but not limited to, upper and lower bounds.", "label": "Range [Member]", "terseLabel": "Range" } } }, "localname": "RangeMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_RestatementAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by revision of previously issued financial statements.", "label": "Restatement [Axis]", "terseLabel": "Restatement" } } }, "localname": "RestatementAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "srt_RestatementDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revision of previously issued financial statements.", "label": "Restatement [Domain]", "terseLabel": "Restatement" } } }, "localname": "RestatementDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "srt_ScheduleOfCondensedBalanceSheetTableTextBlock": { "auth_ref": [ "r418" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations.", "label": "Schedule Of Condensed Balance Sheet Table [Text Block]", "terseLabel": "Condensed Consolidating Balance Sheets" } } }, "localname": "ScheduleOfCondensedBalanceSheetTableTextBlock", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsTables" ], "xbrltype": "textBlockItemType" }, "srt_ScheduleOfCondensedCashFlowStatementTableTextBlock": { "auth_ref": [ "r418" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of condensed cash flow statement, including, but not limited to, cash flow statements of consolidated entities and consolidation eliminations.", "label": "Schedule Of Condensed Cash Flow Statement Table [Text Block]", "terseLabel": "Condensed Consolidating Statements of Cash Flows" } } }, "localname": "ScheduleOfCondensedCashFlowStatementTableTextBlock", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsTables" ], "xbrltype": "textBlockItemType" }, "srt_ScheduleOfCondensedIncomeStatementTableTextBlock": { "auth_ref": [ "r418" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of condensed income statement, including, but not limited to, income statements of consolidated entities and consolidation eliminations.", "label": "Schedule Of Condensed Income Statement Table [Text Block]", "terseLabel": "Condensed Consolidating Statements of Operations" } } }, "localname": "ScheduleOfCondensedIncomeStatementTableTextBlock", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsTables" ], "xbrltype": "textBlockItemType" }, "srt_SegmentGeographicalDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Geographical area.", "label": "Segment Geographical [Domain]", "terseLabel": "Geographical" } } }, "localname": "SegmentGeographicalDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails" ], "xbrltype": "domainItemType" }, "srt_SouthAmericaMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Continent of South America.", "label": "South America [Member]", "terseLabel": "South America [Member]" } } }, "localname": "SouthAmericaMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails" ], "xbrltype": "domainItemType" }, "srt_StatementGeographicalAxis": { "auth_ref": [ "r160", "r250", "r253", "r402", "r403", "r407", "r409" ], "lang": { "en-US": { "role": { "documentation": "Information by geographical components.", "label": "Statement Geographical [Axis]", "terseLabel": "Geographical" } } }, "localname": "StatementGeographicalAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails" ], "xbrltype": "stringItemType" }, "srt_SubsidiaryIssuerMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A company controlled, directly or indirectly, by its parent, which has issued securities and those securities are guaranteed by its parent and another subsidiary of the parent.", "label": "Subsidiary Issuer [Member]", "terseLabel": "Issuer [Member]" } } }, "localname": "SubsidiaryIssuerMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccountingPoliciesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Accounting Policies [Abstract]" } } }, "localname": "AccountingPoliciesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_AccountingStandardsUpdate201409Member": { "auth_ref": [ "r256" ], "lang": { "en-US": { "role": { "documentation": "Accounting Standards Update 2014-09 Revenue from Contracts with Customers (Topic 606).", "label": "Accounting Standards Update201409 [Member]", "terseLabel": "ASC 606 [Member]" } } }, "localname": "AccountingStandardsUpdate201409Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "domainItemType" }, "us-gaap_AccountingStandardsUpdate201707Member": { "auth_ref": [ "r290" ], "lang": { "en-US": { "role": { "documentation": "Accounting Standards Update 2017-07 Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.", "label": "Accounting Standards Update201707 [Member]", "terseLabel": "Accounting Standards Update 2017-07" } } }, "localname": "AccountingStandardsUpdate201707Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccountsPayableCurrent": { "auth_ref": [ "r45" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10190.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Accounts Payable Current", "terseLabel": "Accounts payable" } } }, "localname": "AccountsPayableCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccountsReceivableNetCurrent": { "auth_ref": [ "r32", "r251" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10330.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.", "label": "Accounts Receivable Net Current", "terseLabel": "Accounts receivable (net of allowances of $50.5 and $49.7)", "verboseLabel": "Accounts receivable" } } }, "localname": "AccountsReceivableNetCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccrualForEnvironmentalLossContingencies": { "auth_ref": [ "r203", "r215", "r216" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total costs accrued as of the balance sheet date for environmental loss contingencies.", "label": "Accrual For Environmental Loss Contingencies", "terseLabel": "Accrual for Environmental Loss Contingencies" } } }, "localname": "AccrualForEnvironmentalLossContingencies", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember": { "auth_ref": [ "r71", "r77", "r80", "r277", "r338" ], "lang": { "en-US": { "role": { "documentation": "Accumulated other comprehensive (income) loss related to defined benefit plans attributable to the parent.", "label": "Accumulated Defined Benefit Plans Adjustment [Member]", "terseLabel": "Accumulated Defined Benefit Plans Adjustment [Member]" } } }, "localname": "AccumulatedDefinedBenefitPlansAdjustmentMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment": { "auth_ref": [ "r43", "r194" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails": { "order": 10020.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.", "label": "Accumulated Depreciation Depletion And Amortization Property Plant And Equipment", "negatedLabel": "Less: accumulated depreciation, depletion and amortization" } } }, "localname": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember": { "auth_ref": [ "r67", "r77", "r80", "r337" ], "lang": { "en-US": { "role": { "documentation": "Accumulated other comprehensive income (loss) resulting from gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges, attributable to the parent.", "label": "Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]", "terseLabel": "Accumulated Net Gain (Loss) from Designated or Quality Cash Flow Hedges [Member]" } } }, "localname": "AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember": { "auth_ref": [ "r68", "r69", "r70", "r77", "r80" ], "lang": { "en-US": { "role": { "documentation": "Accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), attributable to parent.", "label": "Accumulated Net Unrealized Investment Gain Loss [Member]", "terseLabel": "Accumulated Net Investment Gain (Loss) [Member]" } } }, "localname": "AccumulatedNetUnrealizedInvestmentGainLossMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Accumulated Other Comprehensive Income Loss [Line Items]", "terseLabel": "Accumulated Other Comprehensive Income (Loss) [Line Items]" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r74", "r76", "r77" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10170.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.", "label": "Accumulated Other Comprehensive Income Loss Net Of Tax", "periodEndLabel": "Balance at end of period", "periodStartLabel": "Balance at beginning of period", "terseLabel": "Accumulated other comprehensive loss" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about components of accumulated other comprehensive income (loss).", "label": "Accumulated Other Comprehensive Income Loss [Table]", "terseLabel": "Accumulated Other Comprehensive Income Loss [Table]" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeMember": { "auth_ref": [ "r73", "r77", "r80", "r338" ], "lang": { "en-US": { "role": { "documentation": "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.", "label": "Accumulated Other Comprehensive Income [Member]", "terseLabel": "AOCI Attributable to Parent" } } }, "localname": "AccumulatedOtherComprehensiveIncomeMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedTranslationAdjustmentMember": { "auth_ref": [ "r65", "r77", "r80", "r338" ], "lang": { "en-US": { "role": { "documentation": "Accumulated other comprehensive income (loss) resulting from foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to the parent.", "label": "Accumulated Translation Adjustment [Member]", "terseLabel": "Accumulated Translation Adjustment [Member]" } } }, "localname": "AccumulatedTranslationAdjustmentMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Acquired Finite Lived Intangible Assets [Line Items]", "terseLabel": "Acquired Finite Lived Intangible Assets [Line Items]" } } }, "localname": "AcquiredFiniteLivedIntangibleAssetsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables" ], "xbrltype": "stringItemType" }, "us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife": { "auth_ref": [ "r184" ], "lang": { "en-US": { "role": { "documentation": "Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Acquired Finite Lived Intangible Assets Weighted Average Useful Life", "terseLabel": "Finite-Lived Intangible Assets, Useful Life" } } }, "localname": "AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails" ], "xbrltype": "durationItemType" }, "us-gaap_AdditionalPaidInCapitalCommonStock": { "auth_ref": [ "r33" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10150.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.", "label": "Additional Paid In Capital Common Stock", "terseLabel": "Capital in excess of par value" } } }, "localname": "AdditionalPaidInCapitalCommonStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdditionalPaidInCapitalMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.", "label": "Additional Paid In Capital [Member]", "terseLabel": "Capital in Excess of Par Value [Member]" } } }, "localname": "AdditionalPaidInCapitalMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "domainItemType" }, "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis": { "auth_ref": [ "r124" ], "lang": { "en-US": { "role": { "documentation": "Information by new accounting pronouncement.", "label": "Adjustments For New Accounting Pronouncements [Axis]", "terseLabel": "Adjustments for New Accounting Pronouncements" } } }, "localname": "AdjustmentsForNewAccountingPronouncementsAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "stringItemType" }, "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": { "auth_ref": [ "r293", "r294", "r295", "r296" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.", "label": "Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value", "terseLabel": "Compensation expense under share-based plans" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract]", "terseLabel": "Adjustments to reconcile consolidated net income to net cash provided by operating activities:" } } }, "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_AllOtherSegmentsMember": { "auth_ref": [ "r143", "r144", "r145", "r146", "r147", "r148" ], "lang": { "en-US": { "role": { "documentation": "Operating segments classified as other. Excludes intersegment elimination and reconciling items.", "label": "All Other Segments [Member]", "terseLabel": "Other Segments [Member]" } } }, "localname": "AllOtherSegmentsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent": { "auth_ref": [ "r58", "r163" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.", "label": "Allowance For Doubtful Accounts Receivable Current", "terseLabel": "Allowance for Doubtful Accounts Receivable, Current" } } }, "localname": "AllowanceForDoubtfulAccountsReceivableCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": { "auth_ref": [ "r136" ], "lang": { "en-US": { "role": { "documentation": "Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.", "label": "Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount", "terseLabel": "Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_Assets": { "auth_ref": [ "r154", "r376", "r389" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.", "label": "Assets", "terseLabel": "Identifiable assets", "totalLabel": "Total Assets" } } }, "localname": "Assets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets [Abstract]", "terseLabel": "ASSETS" } } }, "localname": "AssetsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsCurrent": { "auth_ref": [ "r18", "r19", "r64" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10230.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.", "label": "Assets Current", "totalLabel": "Total current assets" } } }, "localname": "AssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsCurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets Current [Abstract]", "terseLabel": "Current assets:", "verboseLabel": "Current Assets:" } } }, "localname": "AssetsCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent": { "auth_ref": [ "r0", "r1", "r10", "r12", "r192", "r198" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10360.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.", "label": "Assets Of Disposal Group Including Discontinued Operation Current", "terseLabel": "Assets held for sale", "verboseLabel": "Assets held for sale" } } }, "localname": "AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSaleAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_BalanceSheetLocationAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by location on balance sheet (statement of financial position).", "label": "Balance Sheet Location [Axis]", "terseLabel": "Balance Sheet Location" } } }, "localname": "BalanceSheetLocationAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_BalanceSheetLocationDomain": { "auth_ref": [ "r344", "r347" ], "lang": { "en-US": { "role": { "documentation": "Location in the balance sheet (statement of financial position).", "label": "Balance Sheet Location [Domain]", "terseLabel": "Balance Sheet Location" } } }, "localname": "BalanceSheetLocationDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_BaseRateMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Minimum rate investor will accept.", "label": "Base Rate [Member]", "terseLabel": "Base Rate [Member]" } } }, "localname": "BaseRateMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_BasisOfAccountingPolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).", "label": "Basis Of Accounting Policy Policy [Text Block]", "terseLabel": "Basis of Presentation" } } }, "localname": "BasisOfAccountingPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock": { "auth_ref": [ "r123" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for the basis of presentation and significant accounting policies concepts. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). Accounting policies describe all significant accounting policies of the reporting entity.", "label": "Basis Of Presentation And Significant Accounting Policies [Text Block]", "terseLabel": "Basis of Presentation and Significant Accounting Policies" } } }, "localname": "BasisOfPresentationAndSignificantAccountingPoliciesTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_BusinessAcquisitionAcquireeDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Identification of the acquiree in a material business combination (or series of individually immaterial business combinations), which may include the name or other type of identification of the acquiree.", "label": "Business Acquisition Acquiree [Domain]", "terseLabel": "Business Acquisition, Acquiree" } } }, "localname": "BusinessAcquisitionAcquireeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" ], "xbrltype": "domainItemType" }, "us-gaap_BusinessAcquisitionAxis": { "auth_ref": [ "r317", "r318" ], "lang": { "en-US": { "role": { "documentation": "Information by business combination or series of individually immaterial business combinations.", "label": "Business Acquisition [Axis]", "terseLabel": "Business Acquisition" } } }, "localname": "BusinessAcquisitionAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" ], "xbrltype": "stringItemType" }, "us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned": { "auth_ref": [ "r326" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1": { "order": 10030.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.", "label": "Business Acquisition Equity Interest Issued Or Issuable Value Assigned", "negatedLabel": "Stock issued for the purchase of a business" } } }, "localname": "BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued": { "auth_ref": [ "r326" ], "lang": { "en-US": { "role": { "documentation": "Number of shares of equity interests issued or issuable to acquire entity.", "label": "Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued", "terseLabel": "Business Acquisition, Equity Interest Issued or Issuable, Number of Shares", "verboseLabel": "Business acquisition, number of shares issued" } } }, "localname": "BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_BusinessAcquisitionLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Business Acquisition [Line Items]", "terseLabel": "Business Acquisition [Line Items]", "verboseLabel": "Revenue Recognition [Line Items]" } } }, "localname": "BusinessAcquisitionLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_BusinessAcquisitionSharePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.", "label": "Business Acquisition Share Price", "terseLabel": "Business Acquisition, Share Price" } } }, "localname": "BusinessAcquisitionSharePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "perShareItemType" }, "us-gaap_BusinessCombinationAcquisitionRelatedCosts": { "auth_ref": [ "r316" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails": { "order": 10010.0, "parentTag": "wrk_RestructuringAndOtherCostsOther", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10020.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.", "label": "Business Combination Acquisition Related Costs", "terseLabel": "Acquisition costs" } } }, "localname": "BusinessCombinationAcquisitionRelatedCosts", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable": { "auth_ref": [ "r323", "r324" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.", "label": "Business Combination Consideration Transferred Equity Interests Issued And Issuable", "terseLabel": "Business Combination, Consideration Transferred, Equity Interests Issued and Issuable" } } }, "localname": "BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationDisclosureTextBlock": { "auth_ref": [ "r327" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).", "label": "Business Combination Disclosure [Text Block]", "terseLabel": "Acquisitions" } } }, "localname": "BusinessCombinationDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitions" ], "xbrltype": "textBlockItemType" }, "us-gaap_BusinessCombinationIntegrationRelatedCosts": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails": { "order": 10030.0, "parentTag": "wrk_RestructuringAndOtherCostsOther", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10030.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.", "label": "Business Combination Integration Related Costs", "terseLabel": "Integration costs" } } }, "localname": "BusinessCombinationIntegrationRelatedCosts", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10010.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1": { "order": 10010.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of assets acquired at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets", "terseLabel": "Fair value of assets acquired, including goodwill", "totalLabel": "Total assets acquired" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets [Abstract]" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10090.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash And Equivalents", "terseLabel": "Cash and cash equivalents" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10030.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Long Term Debt", "terseLabel": "Current portion of debt" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10040.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Liabilities Other", "terseLabel": "Current liabilities" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10070.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Liabilities Noncurrent", "terseLabel": "Deferred income taxes" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10130.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of intangible assets, excluding goodwill, acquired at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Assets Other Than Goodwill", "terseLabel": "Intangible assets" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10020.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet", "weight": -1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liabilities assumed at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities", "totalLabel": "Liabilities assumed" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet": { "auth_ref": [ "r319", "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net", "totalLabel": "Net assets acquired" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10050.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Long Term Debt", "terseLabel": "Long-term debt due after one year" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10080.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Noncurrent Liabilities Other", "terseLabel": "Other long-term liabilities" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets": { "auth_ref": [ "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10140.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Other Noncurrent Assets", "terseLabel": "Other long-term assets" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment": { "auth_ref": [ "r319", "r320" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10110.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of property, plant, and equipment recognized as of the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Property Plant And Equipment", "terseLabel": "Property, plant and equipment, net" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Business Combinations [Abstract]" } } }, "localname": "BusinessCombinationsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_CalculatedUnderRevenueGuidanceInEffectBeforeTopic606Member": { "auth_ref": [ "r255" ], "lang": { "en-US": { "role": { "documentation": "Calculated under guidance for revenue recognition in effect prior to change to new guidance for revenue from contract with customer when using transition method for cumulative effect in period including initial date of application.", "label": "Calculated Under Revenue Guidance In Effect Before Topic606 [Member]", "terseLabel": "Balances Without Adoption of ASC 606 [Member]" } } }, "localname": "CalculatedUnderRevenueGuidanceInEffectBeforeTopic606Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CapitalLeaseObligationsMember": { "auth_ref": [ "r368" ], "lang": { "en-US": { "role": { "documentation": "A borrowing recorded for a lease meeting the criteria for capitalization. A lease is defined as an agreement conveying the right to use property, plant, or equipment (land or depreciable assets) usually for a stated period of time.", "label": "Capital Lease Obligations [Member]", "terseLabel": "Capital Lease Obligations [Member]" } } }, "localname": "CapitalLeaseObligationsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CapitalizedContractCostAmortizationPeriod": { "auth_ref": [ "r170" ], "lang": { "en-US": { "role": { "documentation": "Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.", "label": "Capitalized Contract Cost Amortization Period", "terseLabel": "Capitalized contract cost, amortization period" } } }, "localname": "CapitalizedContractCostAmortizationPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_CashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r16", "r41", "r114" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10320.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.", "label": "Cash And Cash Equivalents At Carrying Value", "terseLabel": "Cash and cash equivalents" } } }, "localname": "CashAndCashEquivalentsAtCarryingValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": { "auth_ref": [ "r108", "r114", "r117" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations", "periodEndLabel": "Cash, cash equivalents and restricted cash at end of period", "periodStartLabel": "Cash, cash equivalents and restricted cash at beginning of period" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": { "auth_ref": [ "r108", "r359" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect", "totalLabel": "(Decrease) increase in cash, cash equivalents and restricted cash" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromCollectionsReinvestedInRevolvingPeriodTransfers": { "auth_ref": [ "r370" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Cash Flows between a transferor and a transferee attributable to collections reinvested in revolving period transfers related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets).", "label": "Cash Flows Between Transferee And Transferor Proceeds From Collections Reinvested In Revolving Period Transfers", "negatedLabel": "Receivables collected by financial institution" } } }, "localname": "CashFlowsBetweenTransfereeAndTransferorProceedsFromCollectionsReinvestedInRevolvingPeriodTransfers", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueSummaryOfActivityUnderARSalesAgreementDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CatastrophicEventDomain": { "auth_ref": [ "r216", "r217" ], "lang": { "en-US": { "role": { "documentation": "Catastrophic event, for example, but not limited to, earthquake, windstorm, fire or explosion.", "label": "Catastrophic Event [Domain]", "terseLabel": "Catastrophic Event" } } }, "localname": "CatastrophicEventDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CollateralAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by category of collateral or no collateral.", "label": "Collateral [Axis]", "terseLabel": "Collateral" } } }, "localname": "CollateralAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CollateralDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Pledge or no pledge of specific property to serve as protection against default.", "label": "Collateral [Domain]", "terseLabel": "Collateral" } } }, "localname": "CollateralDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CommercialPaperMember": { "auth_ref": [ "r220" ], "lang": { "en-US": { "role": { "documentation": "Unsecured promissory note (generally negotiable) that provides institutions with short-term funds.", "label": "Commercial Paper [Member]", "terseLabel": "Commercial Paper [Member]" } } }, "localname": "CommercialPaperMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CommitmentsAndContingencies": { "auth_ref": [ "r55", "r216", "r381", "r395" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10080.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.", "label": "Commitments And Contingencies", "terseLabel": "Commitments and contingencies (Note 14)" } } }, "localname": "CommitmentsAndContingencies", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": { "auth_ref": [ "r214", "r218" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for commitments and contingencies.", "label": "Commitments And Contingencies Disclosure [Text Block]", "terseLabel": "Commitments and Contingencies" } } }, "localname": "CommitmentsAndContingenciesDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingencies" ], "xbrltype": "textBlockItemType" }, "us-gaap_CommonStockDividendsPerShareCashPaid": { "auth_ref": [ "r239" ], "lang": { "en-US": { "role": { "documentation": "Aggregate dividends paid during the period for each share of common stock outstanding.", "label": "Common Stock Dividends Per Share Cash Paid", "terseLabel": "Cash dividends paid per common share", "verboseLabel": "Cash dividends paid per share" } } }, "localname": "CommonStockDividendsPerShareCashPaid", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Stock that is subordinate to all other stock of the issuer.", "label": "Common Stock [Member]", "terseLabel": "Common Stock [Member]" } } }, "localname": "CommonStockMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "domainItemType" }, "us-gaap_CommonStockParOrStatedValuePerShare": { "auth_ref": [ "r31" ], "lang": { "en-US": { "role": { "documentation": "Face amount or stated value per share of common stock.", "label": "Common Stock Par Or Stated Value Per Share", "terseLabel": "Common Stock, Par or Stated Value Per Share" } } }, "localname": "CommonStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockSharesAuthorized": { "auth_ref": [ "r31" ], "lang": { "en-US": { "role": { "documentation": "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.", "label": "Common Stock Shares Authorized", "terseLabel": "Common Stock, Shares Authorized" } } }, "localname": "CommonStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesOutstanding": { "auth_ref": [ "r31", "r234" ], "lang": { "en-US": { "role": { "documentation": "Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.", "label": "Common Stock Shares Outstanding", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance", "terseLabel": "Common Stock, Shares, Outstanding" } } }, "localname": "CommonStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockValue": { "auth_ref": [ "r31" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10140.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.", "label": "Common Stock Value", "terseLabel": "Common Stock, $0.01 par value; 600.0 million shares authorized; 257.3 million and 253.5 million shares outstanding at June 30, 2019 and September 30, 2018, respectively" } } }, "localname": "CommonStockValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomeNetOfTax": { "auth_ref": [ "r83", "r85", "r86" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.", "label": "Comprehensive Income Net Of Tax", "terseLabel": "Comprehensive (loss) income attributable to common stockholders", "totalLabel": "Comprehensive income attributable to common stockholders" } } }, "localname": "ComprehensiveIncomeNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest": { "auth_ref": [ "r83", "r85", "r332", "r333", "r342" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10020.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.", "label": "Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest", "negatedLabel": "Less: Comprehensive income attributable to noncontrolling interests" } } }, "localname": "ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest": { "auth_ref": [ "r83", "r85", "r331", "r342" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10010.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.", "label": "Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest", "totalLabel": "Comprehensive income" } } }, "localname": "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractWithCustomerAssetAndLiabilityTableTextBlock": { "auth_ref": [ "r246" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of contract balances and changes in contract balances.", "label": "Contract With Customer Asset And Liability Table [Text Block]", "terseLabel": "Summary of Opening and Closing Balances of Contract Assets and Contract Liabilities" } } }, "localname": "ContractWithCustomerAssetAndLiabilityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ContractWithCustomerAssetNetCurrent": { "auth_ref": [ "r242", "r244" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.", "label": "Contract With Customer Asset Net Current", "periodEndLabel": "Short-Term Contract Assets, Ending balance", "periodStartLabel": "Short-Term Contract Assets, Beginning balance" } } }, "localname": "ContractWithCustomerAssetNetCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ContractWithCustomerLiabilityCurrent": { "auth_ref": [ "r242", "r243", "r251" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.", "label": "Contract With Customer Liability Current", "periodEndLabel": "Short-Term Contract Liabilities, Ending balance", "periodStartLabel": "Short-Term Contract Liabilities, Beginning balance" } } }, "localname": "ContractWithCustomerLiabilityCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_CorporateMember": { "auth_ref": [ "r145" ], "lang": { "en-US": { "role": { "documentation": "Component of an entity that usually provides financial, operational and administrative support and is considered an operating segment. Excludes intersegment elimination and reconciling items.", "label": "Corporate [Member]", "terseLabel": "Corporate Segment [Member]" } } }, "localname": "CorporateMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CorporateNonSegmentMember": { "auth_ref": [ "r159" ], "lang": { "en-US": { "role": { "documentation": "Corporate headquarters or functional department that may not earn revenues or may earn revenues that are only incidental to the activities of the entity and is not considered an operating segment.", "label": "Corporate Non Segment [Member]", "terseLabel": "Corporate, Non-Segment [Member]" } } }, "localname": "CorporateNonSegmentMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CostOfGoodsAndServicesSold": { "auth_ref": [ "r92" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10120.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.", "label": "Cost Of Goods And Services Sold", "terseLabel": "Cost of goods sold", "verboseLabel": "Cost of goods sold" } } }, "localname": "CostOfGoodsAndServicesSold", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_CostOfSalesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Primary financial statement caption encompassing cost of sales.", "label": "Cost Of Sales [Member]", "terseLabel": "Cost of Goods Sold [Member]" } } }, "localname": "CostOfSalesMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CreditFacilityAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.", "label": "Credit Facility [Axis]", "terseLabel": "Credit Facility" } } }, "localname": "CreditFacilityAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_CreditFacilityDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Type of credit facility. Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.", "label": "Credit Facility [Domain]", "terseLabel": "Credit Facility" } } }, "localname": "CreditFacilityDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_CustomerRelationshipsMember": { "auth_ref": [ "r322" ], "lang": { "en-US": { "role": { "documentation": "Customer relationship that exists between an entity and its customer, for example, but not limited to, tenant relationships.", "label": "Customer Relationships [Member]", "terseLabel": "Customer Relationships [Member]" } } }, "localname": "CustomerRelationshipsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DebtCurrent": { "auth_ref": [ "r48" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails": { "order": 10010.0, "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10180.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.", "label": "Debt Current", "terseLabel": "Current portion of debt", "verboseLabel": "Less: current portion of debt" } } }, "localname": "DebtCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Debt Disclosure [Abstract]" } } }, "localname": "DebtDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_DebtDisclosureTextBlock": { "auth_ref": [ "r229" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.", "label": "Debt Disclosure [Text Block]", "terseLabel": "Debt" } } }, "localname": "DebtDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebt" ], "xbrltype": "textBlockItemType" }, "us-gaap_DebtInstrumentAxis": { "auth_ref": [ "r26", "r27", "r28", "r377", "r378", "r387" ], "lang": { "en-US": { "role": { "documentation": "Information by type of debt instrument, including, but not limited to, draws against credit facilities.", "label": "Debt Instrument [Axis]", "terseLabel": "Debt Instrument" } } }, "localname": "DebtInstrumentAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Percentage points added to the reference rate to compute the variable rate on the debt instrument.", "label": "Debt Instrument Basis Spread On Variable Rate1", "terseLabel": "Applicable margin" } } }, "localname": "DebtInstrumentBasisSpreadOnVariableRate1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentFaceAmount": { "auth_ref": [ "r365", "r367" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Face (par) amount of debt instrument at time of issuance.", "label": "Debt Instrument Face Amount", "terseLabel": "Debt instrument, aggregate principal amount" } } }, "localname": "DebtInstrumentFaceAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentFairValue": { "auth_ref": [ "r356" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.", "label": "Debt Instrument Fair Value", "terseLabel": "Fair value of debt" } } }, "localname": "DebtInstrumentFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentInterestRateEffectivePercentage": { "auth_ref": [ "r51", "r226", "r365" ], "lang": { "en-US": { "role": { "documentation": "Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.", "label": "Debt Instrument Interest Rate Effective Percentage", "terseLabel": "Debt instrument, effective interest rate" } } }, "localname": "DebtInstrumentInterestRateEffectivePercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentInterestRateStatedPercentage": { "auth_ref": [ "r51" ], "lang": { "en-US": { "role": { "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.", "label": "Debt Instrument Interest Rate Stated Percentage", "terseLabel": "Debt instrument, interest rate" } } }, "localname": "DebtInstrumentInterestRateStatedPercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentInterestRateTerms": { "auth_ref": [ "r51" ], "lang": { "en-US": { "role": { "documentation": "Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.", "label": "Debt Instrument Interest Rate Terms", "terseLabel": "Debt instrument, interest rate description" } } }, "localname": "DebtInstrumentInterestRateTerms", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Debt Instrument [Line Items]", "terseLabel": "Debt Instrument [Line Items]" } } }, "localname": "DebtInstrumentLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentMaturityDate": { "auth_ref": [ "r52", "r354" ], "lang": { "en-US": { "role": { "documentation": "Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.", "label": "Debt Instrument Maturity Date", "terseLabel": "Debt instrument, maturity date" } } }, "localname": "DebtInstrumentMaturityDate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "us-gaap_DebtInstrumentNameDomain": { "auth_ref": [ "r53" ], "lang": { "en-US": { "role": { "documentation": "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.", "label": "Debt Instrument Name [Domain]", "terseLabel": "Debt Instrument, Name" } } }, "localname": "DebtInstrumentNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DebtInstrumentTable": { "auth_ref": [ "r53", "r119", "r235", "r236", "r237", "r238", "r364", "r365", "r367", "r386" ], "lang": { "en-US": { "role": { "documentation": "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.", "label": "Debt Instrument [Table]", "terseLabel": "Debt Instrument [Table]" } } }, "localname": "DebtInstrumentTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentTerm": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Debt Instrument Term", "terseLabel": "Debt instrument, maturity period" } } }, "localname": "DebtInstrumentTerm", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_DebtInstrumentUnamortizedDiscount": { "auth_ref": [ "r364", "r367" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after accumulated amortization, of debt discount.", "label": "Debt Instrument Unamortized Discount", "terseLabel": "Debt instrument, discount" } } }, "localname": "DebtInstrumentUnamortizedDiscount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtLongtermAndShorttermCombinedAmount": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the aggregate of total long-term debt, including current maturities and short-term debt.", "label": "Debt Longterm And Shortterm Combined Amount", "totalLabel": "Total debt" } } }, "localname": "DebtLongtermAndShorttermCombinedAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtWeightedAverageInterestRate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average interest rate of debt outstanding.", "label": "Debt Weighted Average Interest Rate", "terseLabel": "Average borrowing rate" } } }, "localname": "DebtWeightedAverageInterestRate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_DeferredFinanceCostsGross": { "auth_ref": [ "r366" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.", "label": "Deferred Finance Costs Gross", "terseLabel": "Debt instrument, issuance costs" } } }, "localname": "DeferredFinanceCostsGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredFinanceCostsNet": { "auth_ref": [ "r44", "r366" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.", "label": "Deferred Finance Costs Net", "terseLabel": "Debt issuance costs" } } }, "localname": "DeferredFinanceCostsNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredIncomeTaxExpenseBenefit": { "auth_ref": [ "r112", "r118", "r310", "r312" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10350.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.", "label": "Deferred Income Tax Expense Benefit", "terseLabel": "Deferred income tax expense (benefit)" } } }, "localname": "DeferredIncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxLiabilitiesNoncurrent": { "auth_ref": [ "r298", "r299", "r300" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10070.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10060.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.", "label": "Deferred Tax Liabilities Noncurrent", "terseLabel": "Deferred income taxes" } } }, "localname": "DeferredTaxLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent": { "auth_ref": [ "r29", "r260", "r261", "r267" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10040.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10030.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.", "label": "Defined Benefit Pension Plan Liabilities Noncurrent", "terseLabel": "Pension liabilities, net of current portion" } } }, "localname": "DefinedBenefitPensionPlanLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]" } } }, "localname": "DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses": { "auth_ref": [ "r274", "r286", "r289" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10070.0, "parentTag": "wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany", "weight": -1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails2": { "order": 10030.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.", "label": "Defined Benefit Plan Amortization Of Gains Losses", "negatedLabel": "Amortization of net actuarial loss (gain)" } } }, "localname": "DefinedBenefitPlanAmortizationOfGainsLosses", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit": { "auth_ref": [ "r275", "r287", "r289" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10080.0, "parentTag": "wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails2": { "order": 10040.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.", "label": "Defined Benefit Plan Amortization Of Prior Service Cost Credit", "terseLabel": "Amortization of prior service cost (credit)" } } }, "localname": "DefinedBenefitPlanAmortizationOfPriorServiceCostCredit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent": { "auth_ref": [ "r25", "r260", "r261", "r267", "r375", "r388" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10280.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.", "label": "Defined Benefit Plan Assets For Plan Benefits Noncurrent", "terseLabel": "Prepaid pension asset" } } }, "localname": "DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanContributionsByEmployer": { "auth_ref": [ "r266", "r268", "r269", "r288", "r289" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of contribution received by defined benefit plan from employer which increases plan assets.", "label": "Defined Benefit Plan Contributions By Employer", "terseLabel": "Contributions by employer to pension and supplemental retirement plans" } } }, "localname": "DefinedBenefitPlanContributionsByEmployer", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanCurtailments": { "auth_ref": [ "r264" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10090.0, "parentTag": "wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees.", "label": "Defined Benefit Plan Curtailments", "terseLabel": "Curtailment loss" } } }, "localname": "DefinedBenefitPlanCurtailments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanDisclosureLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Defined Benefit Plan Disclosure [Line Items]", "terseLabel": "Defined Benefit Plan Disclosure [Line Items]" } } }, "localname": "DefinedBenefitPlanDisclosureLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets": { "auth_ref": [ "r273", "r285", "r289" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10060.0, "parentTag": "wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.", "label": "Defined Benefit Plan Expected Return On Plan Assets", "negatedLabel": "Expected return on plan assets" } } }, "localname": "DefinedBenefitPlanExpectedReturnOnPlanAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanInterestCost": { "auth_ref": [ "r265", "r272", "r284", "r289" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10050.0, "parentTag": "wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails2": { "order": 10020.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost recognized for passage of time related to defined benefit plan.", "label": "Defined Benefit Plan Interest Cost", "terseLabel": "Interest cost" } } }, "localname": "DefinedBenefitPlanInterestCost", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost": { "auth_ref": [ "r270", "r282", "r289" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails2": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of net periodic benefit cost (credit) for defined benefit plan.", "label": "Defined Benefit Plan Net Periodic Benefit Cost", "totalLabel": "Net pension (income) cost" } } }, "localname": "DefinedBenefitPlanNetPeriodicBenefitCost", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlanServiceCost": { "auth_ref": [ "r263", "r271", "r283", "r289" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10040.0, "parentTag": "wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails2": { "order": 10010.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.", "label": "Defined Benefit Plan Service Cost", "terseLabel": "Service cost" } } }, "localname": "DefinedBenefitPlanServiceCost", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable": { "auth_ref": [ "r278", "r279", "r280", "r281", "r289" ], "lang": { "en-US": { "role": { "documentation": "Disclosures and provisions pertaining to defined benefit pension plans or other postretirement defined benefit plans. The arrangements are generally based on terms and conditions stipulated by the entity, and which contain a promise by the employer to pay certain amounts or awards at designated future dates, including a period after retirement, upon compliance with stipulated requirements. Excludes disclosures pertaining to defined contribution plans.", "label": "Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table]", "terseLabel": "Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Table]" } } }, "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]", "terseLabel": "Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]" } } }, "localname": "DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DepreciationDepletionAndAmortization": { "auth_ref": [ "r112", "r151" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10330.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.", "label": "Depreciation Depletion And Amortization", "terseLabel": "Depreciation, depletion and amortization" } } }, "localname": "DepreciationDepletionAndAmortization", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_DerivativeContractTypeDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Financial instrument or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.", "label": "Derivative Contract Type [Domain]", "terseLabel": "Derivative Contract" } } }, "localname": "DerivativeContractTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DerivativeInstrumentRiskAxis": { "auth_ref": [ "r345", "r346", "r349", "r351" ], "lang": { "en-US": { "role": { "documentation": "Information by type of derivative contract.", "label": "Derivative Instrument Risk [Axis]", "terseLabel": "Derivative Instrument" } } }, "localname": "DerivativeInstrumentRiskAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member": { "auth_ref": [ "r255" ], "lang": { "en-US": { "role": { "documentation": "Effect in current period from application of guidance for revenue from contract with customer compared with guidance for revenue recognition applicable prior to change when using transition method for cumulative effect in period including initial date of application.", "label": "Difference Between Revenue Guidance In Effect Before And After Topic606 [Member]", "terseLabel": "Impact of Adoption Increase/(Decrease) [Member]" } } }, "localname": "DifferenceBetweenRevenueGuidanceInEffectBeforeAndAfterTopic606Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DisaggregationOfRevenueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Disaggregation Of Revenue [Abstract]" } } }, "localname": "DisaggregationOfRevenueAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Disaggregation Of Revenue [Line Items]", "terseLabel": "Disaggregation Of Revenue [Line Items]" } } }, "localname": "DisaggregationOfRevenueLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.", "label": "Disaggregation Of Revenue [Table]", "terseLabel": "Disaggregation Of Revenue [Table]" } } }, "localname": "DisaggregationOfRevenueTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueTableTextBlock": { "auth_ref": [ "r250" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.", "label": "Disaggregation Of Revenue Table [Text Block]", "terseLabel": "Schedule of Disaggregate Revenue by Geographical Market and Product Type (Segment)" } } }, "localname": "DisaggregationOfRevenueTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember": { "auth_ref": [ "r12", "r191", "r200" ], "lang": { "en-US": { "role": { "documentation": "Disposal group that is classified as held-for-sale. Excludes disposals classified as discontinued operations.", "label": "Disposal Group Heldforsale Not Discontinued Operations [Member]", "terseLabel": "Disposal Group, Held-for-sale, Not Discontinued Operations [Member]" } } }, "localname": "DisposalGroupHeldforsaleNotDiscontinuedOperationsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Name of disposal group.", "label": "Disposal Groups Including Discontinued Operations Name [Domain]", "terseLabel": "Disposal Group Name" } } }, "localname": "DisposalGroupsIncludingDiscontinuedOperationsNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSaleAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_DividendsCommonStockCash": { "auth_ref": [ "r239" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.", "label": "Dividends Common Stock Cash", "negatedLabel": "Dividends declared (per share - $0.455, $0.43, $1.365 and $1.29)" } } }, "localname": "DividendsCommonStockCash", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "us-gaap_EarningsPerShareAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Earnings Per Share [Abstract]" } } }, "localname": "EarningsPerShareAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareBasic": { "auth_ref": [ "r91", "r125", "r131", "r133", "r134", "r135", "r138", "r385", "r398" ], "lang": { "en-US": { "role": { "documentation": "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.", "label": "Earnings Per Share Basic", "terseLabel": "Basic earnings per share attributable to common stockholders" } } }, "localname": "EarningsPerShareBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareDiluted": { "auth_ref": [ "r91", "r125", "r131", "r133", "r134", "r135", "r138", "r385", "r398" ], "lang": { "en-US": { "role": { "documentation": "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.", "label": "Earnings Per Share Diluted", "terseLabel": "Diluted earnings per share attributable to common stockholders" } } }, "localname": "EarningsPerShareDiluted", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareTextBlock": { "auth_ref": [ "r139" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for earnings per share.", "label": "Earnings Per Share [Text Block]", "terseLabel": "Earnings Per Share" } } }, "localname": "EarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShare" ], "xbrltype": "textBlockItemType" }, "us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": { "auth_ref": [ "r359" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10040.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.", "label": "Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations", "terseLabel": "Effect of exchange rate changes on cash, cash equivalents and restricted cash" } } }, "localname": "EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_EffectiveIncomeTaxRateContinuingOperations": { "auth_ref": [ "r120", "r301", "r302" ], "lang": { "en-US": { "role": { "documentation": "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Effective Income Tax Rate Continuing Operations", "terseLabel": "Effective tax rates" } } }, "localname": "EffectiveIncomeTaxRateContinuingOperations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate": { "auth_ref": [ "r301", "r302", "r311" ], "lang": { "en-US": { "role": { "documentation": "Percentage of domestic federal statutory tax rate applicable to pretax income (loss).", "label": "Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate", "terseLabel": "Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent" } } }, "localname": "EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_EmployeeRelatedLiabilitiesCurrent": { "auth_ref": [ "r49" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10200.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Employee Related Liabilities Current", "terseLabel": "Accrued compensation and benefits" } } }, "localname": "EmployeeRelatedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeSeveranceMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Termination of an employee associated with exit from or disposal of business activities or restructurings pursuant to a plan.", "label": "Employee Severance [Member]", "terseLabel": "Severance and Other Employee Costs [Member]" } } }, "localname": "EmployeeSeveranceMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_EquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Equity [Abstract]", "terseLabel": "Equity:" } } }, "localname": "EquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_EquityComponentDomain": { "auth_ref": [ "r234" ], "lang": { "en-US": { "role": { "documentation": "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.", "label": "Equity Component [Domain]", "terseLabel": "Equity Component" } } }, "localname": "EquityComponentDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "domainItemType" }, "us-gaap_FIFOInventoryAmount": { "auth_ref": [ "r22" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails": { "order": 10010.0, "parentTag": "us-gaap_InventoryNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.", "label": "F I F O Inventory Amount", "totalLabel": "Inventories at FIFO cost" } } }, "localname": "FIFOInventoryAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]", "terseLabel": "Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]" } } }, "localname": "FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByBalanceSheetGroupingTable": { "auth_ref": [ "r352", "r357", "r358" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.", "label": "Fair Value By Balance Sheet Grouping [Table]", "terseLabel": "Fair Value By Balance Sheet Grouping [Table]" } } }, "localname": "FairValueByBalanceSheetGroupingTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByBalanceSheetGroupingTextBlock": { "auth_ref": [ "r352", "r357" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.", "label": "Fair Value By Balance Sheet Grouping [Text Block]", "terseLabel": "Summary of Activity Under A/R Sales Agreement" } } }, "localname": "FairValueByBalanceSheetGroupingTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueDisclosuresAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Fair Value Disclosures [Abstract]" } } }, "localname": "FairValueDisclosuresAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosuresTextBlock": { "auth_ref": [ "r355" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.", "label": "Fair Value Disclosures [Text Block]", "terseLabel": "Fair Value" } } }, "localname": "FairValueDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValue" ], "xbrltype": "textBlockItemType" }, "us-gaap_FiniteLivedIntangibleAssetUsefulLife": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Finite Lived Intangible Asset Useful Life", "terseLabel": "Finite-Lived Intangible Assets, Useful Life" } } }, "localname": "FiniteLivedIntangibleAssetUsefulLife", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis": { "auth_ref": [ "r182", "r185", "r188", "r189", "r372" ], "lang": { "en-US": { "role": { "documentation": "Information by major type or class of finite-lived intangible assets.", "label": "Finite Lived Intangible Assets By Major Class [Axis]", "terseLabel": "Finite-Lived Intangible Assets by Major Class" } } }, "localname": "FiniteLivedIntangibleAssetsByMajorClassAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain": { "auth_ref": [ "r182", "r187" ], "lang": { "en-US": { "role": { "documentation": "The major class of finite-lived intangible asset (for example, patents, trademarks, copyrights, etc.) A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.", "label": "Finite Lived Intangible Assets Major Class Name [Domain]", "terseLabel": "Finite-Lived Intangible Assets, Major Class Name" } } }, "localname": "FiniteLivedIntangibleAssetsMajorClassNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails" ], "xbrltype": "domainItemType" }, "us-gaap_FinitelivedIntangibleAssetsAcquired1": { "auth_ref": [ "r183" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.", "label": "Finitelived Intangible Assets Acquired1", "terseLabel": "Gross Carrying Amount" } } }, "localname": "FinitelivedIntangibleAssetsAcquired1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ForeignExchangeContractMember": { "auth_ref": [ "r268", "r350" ], "lang": { "en-US": { "role": { "documentation": "Derivative instrument whose primary underlying risk is tied to foreign exchange rates.", "label": "Foreign Exchange Contract [Member]", "terseLabel": "Foreign Exchange Contract [Member]", "verboseLabel": "Foreign Exchange Contracts [Member]" } } }, "localname": "ForeignExchangeContractMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_GainLossOnDispositionOfAssets1": { "auth_ref": [ "r112" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10150.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.", "label": "Gain Loss On Disposition Of Assets1", "negatedLabel": "Loss (gain) on disposal of assets" } } }, "localname": "GainLossOnDispositionOfAssets1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_GainLossOnSaleOfBusiness": { "auth_ref": [ "r112", "r339" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10020.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.", "label": "Gain Loss On Sale Of Business", "terseLabel": "(Loss) gain on sale of certain closed facilities" } } }, "localname": "GainLossOnSaleOfBusiness", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": { "auth_ref": [ "r112" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10410.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.", "label": "Gain Loss On Sale Of Property Plant Equipment", "negatedLabel": "(Gain) loss on disposal of plant and equipment and other, net" } } }, "localname": "GainLossOnSaleOfPropertyPlantEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_GainsLossesOnExtinguishmentOfDebt": { "auth_ref": [ "r112", "r227", "r228" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10080.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10040.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10070.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.", "label": "Gains Losses On Extinguishment Of Debt", "terseLabel": "(Loss) gain on extinguishment of debt", "verboseLabel": "Gain (loss) on extinguishment of debt" } } }, "localname": "GainsLossesOnExtinguishmentOfDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_Goodwill": { "auth_ref": [ "r171", "r172" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10120.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10250.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.", "label": "Goodwill", "periodEndLabel": "Goodwill, end of period", "periodStartLabel": "Goodwill, beginning of period", "terseLabel": "Goodwill" } } }, "localname": "Goodwill", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillAcquiredDuringPeriod": { "auth_ref": [ "r174" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.", "label": "Goodwill Acquired During Period", "terseLabel": "Goodwill acquired" } } }, "localname": "GoodwillAcquiredDuringPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillGross": { "auth_ref": [ "r173", "r176" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.", "label": "Goodwill Gross", "periodEndLabel": "Goodwill, Gross end of period", "periodStartLabel": "Goodwill, Gross beginning of period" } } }, "localname": "GoodwillGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillImpairedAccumulatedImpairmentLoss": { "auth_ref": [ "r173", "r176" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.", "label": "Goodwill Impaired Accumulated Impairment Loss", "negatedPeriodEndLabel": "Accumulated impairment losses, end of period", "negatedPeriodStartLabel": "Accumulated impairment losses, beginning of period" } } }, "localname": "GoodwillImpairedAccumulatedImpairmentLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillPurchaseAccountingAdjustments": { "auth_ref": [ "r175", "r315" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.", "label": "Goodwill Purchase Accounting Adjustments", "terseLabel": "Purchase price allocation adjustments" } } }, "localname": "GoodwillPurchaseAccountingAdjustments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Goodwill Roll Forward", "terseLabel": "Goodwill [Roll Forward]" } } }, "localname": "GoodwillRollForward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "stringItemType" }, "us-gaap_GuaranteeObligationsCurrentCarryingValue": { "auth_ref": [ "r219" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.", "label": "Guarantee Obligations Current Carrying Value", "terseLabel": "Guarantor Obligations, Current Carrying Value" } } }, "localname": "GuaranteeObligationsCurrentCarryingValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_HurricaneMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tropical windstorm with sustained winds of 74 miles per hour (119 kilometers per hour).", "label": "Hurricane [Member]", "terseLabel": "Hurricane Michael [Member]" } } }, "localname": "HurricaneMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ImpairmentOfIntangibleAssetsFinitelived": { "auth_ref": [ "r112", "r190" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.", "label": "Impairment Of Intangible Assets Finitelived", "terseLabel": "Impairment of intangible assets, finite-lived" } } }, "localname": "ImpairmentOfIntangibleAssetsFinitelived", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest": { "auth_ref": [ "r88", "r125", "r374", "r383", "r399" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10030.0, "parentTag": "us-gaap_ProfitLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.", "label": "Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest", "totalLabel": "Income before income taxes" } } }, "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromEquityMethodInvestments": { "auth_ref": [ "r89", "r112", "r152", "r167", "r382", "r396" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10070.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10100.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.", "label": "Income Loss From Equity Method Investments", "terseLabel": "Equity in income of unconsolidated entities", "verboseLabel": "Equity in income of unconsolidated entities" } } }, "localname": "IncomeLossFromEquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeStatementAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Income Statement [Abstract]" } } }, "localname": "IncomeStatementAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by name of disposal group.", "label": "Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Axis]", "terseLabel": "Disposal Group Name" } } }, "localname": "IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSaleAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]", "terseLabel": "Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]" } } }, "localname": "IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSaleAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable": { "auth_ref": [ "r1", "r4", "r5", "r6", "r7", "r8", "r9", "r11", "r13", "r14", "r15", "r200", "r201" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.", "label": "Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table]", "terseLabel": "Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table]" } } }, "localname": "IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSaleAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementLocationAxis": { "auth_ref": [ "r197" ], "lang": { "en-US": { "role": { "documentation": "Information by location in the income statement.", "label": "Income Statement Location [Axis]", "terseLabel": "Income Statement Location" } } }, "localname": "IncomeStatementLocationAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_IncomeStatementLocationDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Location in the income statement.", "label": "Income Statement Location [Domain]", "terseLabel": "Income Statement Location" } } }, "localname": "IncomeStatementLocationDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IncomeTaxDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Income Tax Disclosure [Abstract]" } } }, "localname": "IncomeTaxDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_IncomeTaxDisclosureTextBlock": { "auth_ref": [ "r314" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.", "label": "Income Tax Disclosure [Text Block]", "terseLabel": "Income Taxes" } } }, "localname": "IncomeTaxDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxes" ], "xbrltype": "textBlockItemType" }, "us-gaap_IncomeTaxExpenseBenefit": { "auth_ref": [ "r118", "r153", "r313" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10040.0, "parentTag": "us-gaap_ProfitLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.", "label": "Income Tax Expense Benefit", "negatedLabel": "Income tax (expense) benefit", "negatedTerseLabel": "Income tax benefit (expense)" } } }, "localname": "IncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeTaxesPaidNet": { "auth_ref": [ "r116" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.", "label": "Income Taxes Paid Net", "terseLabel": "Income taxes, net of refunds" } } }, "localname": "IncomeTaxesPaidNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccountsPayable": { "auth_ref": [ "r111" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10460.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.", "label": "Increase Decrease In Accounts Payable", "terseLabel": "Accounts payable" } } }, "localname": "IncreaseDecreaseInAccountsPayable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccountsReceivable": { "auth_ref": [ "r111" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10430.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.", "label": "Increase Decrease In Accounts Receivable", "negatedLabel": "Accounts receivable" } } }, "localname": "IncreaseDecreaseInAccountsReceivable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccruedLiabilities": { "auth_ref": [ "r111" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10480.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.", "label": "Increase Decrease In Accrued Liabilities", "terseLabel": "Accrued liabilities and other" } } }, "localname": "IncreaseDecreaseInAccruedLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInContractWithCustomerAsset": { "auth_ref": [ "r111" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.", "label": "Increase Decrease In Contract With Customer Asset", "terseLabel": "(Decrease) / Increase in Short-Term Contract Assets" } } }, "localname": "IncreaseDecreaseInContractWithCustomerAsset", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInContractWithCustomerLiability": { "auth_ref": [ "r111" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.", "label": "Increase Decrease In Contract With Customer Liability", "terseLabel": "(Decrease) / increase in Short-Term Contract Liabilities" } } }, "localname": "IncreaseDecreaseInContractWithCustomerLiability", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable": { "auth_ref": [ "r111" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10470.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes.", "label": "Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable", "terseLabel": "Income taxes" } } }, "localname": "IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInInventories": { "auth_ref": [ "r111" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10440.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.", "label": "Increase Decrease In Inventories", "negatedLabel": "Inventories" } } }, "localname": "IncreaseDecreaseInInventories", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Increase Decrease In Operating Capital [Abstract]", "terseLabel": "Change in operating assets and liabilities, net of acquisitions and divestitures:" } } }, "localname": "IncreaseDecreaseInOperatingCapitalAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_IncreaseDecreaseInOtherOperatingAssets": { "auth_ref": [ "r111" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10450.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in operating assets classified as other.", "label": "Increase Decrease In Other Operating Assets", "negatedLabel": "Other assets" } } }, "localname": "IncreaseDecreaseInOtherOperatingAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_InitialApplicationPeriodCumulativeEffectTransitionAxis": { "auth_ref": [ "r255" ], "lang": { "en-US": { "role": { "documentation": "Information about effect of transition method for cumulative effect in initial period of application.", "label": "Initial Application Period Cumulative Effect Transition [Axis]", "terseLabel": "Initial Application Period Cumulative Effect Transition" } } }, "localname": "InitialApplicationPeriodCumulativeEffectTransitionAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails" ], "xbrltype": "stringItemType" }, "us-gaap_InitialApplicationPeriodCumulativeEffectTransitionDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Effect of transition method for cumulative effect in initial period of application.", "label": "Initial Application Period Cumulative Effect Transition [Domain]", "terseLabel": "Initial Application Period Cumulative Effect Transition" } } }, "localname": "InitialApplicationPeriodCumulativeEffectTransitionDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails" ], "xbrltype": "domainItemType" }, "us-gaap_IntangibleAssetsNetExcludingGoodwill": { "auth_ref": [ "r181", "r186" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10260.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.", "label": "Intangible Assets Net Excluding Goodwill", "terseLabel": "Intangibles, net" } } }, "localname": "IntangibleAssetsNetExcludingGoodwill", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestIncomeExpenseNonoperatingNet": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10070.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10020.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10060.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The net amount of nonoperating interest income (expense).", "label": "Interest Income Expense Nonoperating Net", "terseLabel": "Interest expense, net", "verboseLabel": "Interest expense, net" } } }, "localname": "InterestIncomeExpenseNonoperatingNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestPaidNet": { "auth_ref": [ "r105", "r109", "r116" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.", "label": "Interest Paid Net", "terseLabel": "Interest, net of amounts capitalized" } } }, "localname": "InterestPaidNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_IntersegmentEliminationMember": { "auth_ref": [ "r156" ], "lang": { "en-US": { "role": { "documentation": "Eliminating entries used in operating segment consolidation.", "label": "Intersegment Elimination [Member]", "terseLabel": "Intersegment Sales [Member]", "verboseLabel": "Intersegment Eliminations [Member]" } } }, "localname": "IntersegmentEliminationMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_InventoryDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Inventory Disclosure [Abstract]" } } }, "localname": "InventoryDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_InventoryDisclosureTextBlock": { "auth_ref": [ "r169" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.", "label": "Inventory Disclosure [Text Block]", "terseLabel": "Inventories" } } }, "localname": "InventoryDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventories" ], "xbrltype": "textBlockItemType" }, "us-gaap_InventoryFinishedGoodsAndWorkInProcess": { "auth_ref": [ "r59" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails": { "order": 10030.0, "parentTag": "us-gaap_FIFOInventoryAmount", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before valuation reserves of merchandise or goods held by the entity that are readily available for sale and items held by the entity which are partially complete or in the process of being readied for sale.", "label": "Inventory Finished Goods And Work In Process", "terseLabel": "Finished goods and work in process" } } }, "localname": "InventoryFinishedGoodsAndWorkInProcess", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InventoryLIFOReserve": { "auth_ref": [ "r62" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails": { "order": 10020.0, "parentTag": "us-gaap_InventoryNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.", "label": "Inventory L I F O Reserve", "negatedLabel": "LIFO reserve" } } }, "localname": "InventoryLIFOReserve", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_InventoryNet": { "auth_ref": [ "r17", "r61", "r168" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10340.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.", "label": "Inventory Net", "terseLabel": "Inventories", "totalLabel": "Net inventories" } } }, "localname": "InventoryNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_InventoryRawMaterials": { "auth_ref": [ "r60" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails": { "order": 10040.0, "parentTag": "us-gaap_FIFOInventoryAmount", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.", "label": "Inventory Raw Materials", "terseLabel": "Raw materials" } } }, "localname": "InventoryRawMaterials", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LandAndBuildingMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Real estate held for productive use and structures used in the conduct of business, including but not limited to, office, production, storage and distribution facilities.", "label": "Land And Building [Member]", "terseLabel": "Land and Buildings [Member]" } } }, "localname": "LandAndBuildingMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LeaseholdImprovementsMember": { "auth_ref": [ "r193" ], "lang": { "en-US": { "role": { "documentation": "Additions or improvements to assets held under a lease arrangement.", "label": "Leasehold Improvements [Member]", "terseLabel": "Leasehold Improvements [Member]" } } }, "localname": "LeaseholdImprovementsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LiabilitiesAndStockholdersEquity": { "auth_ref": [ "r37", "r380", "r393" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.", "label": "Liabilities And Stockholders Equity", "totalLabel": "Total Liabilities and Equity" } } }, "localname": "LiabilitiesAndStockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Liabilities And Stockholders Equity [Abstract]", "terseLabel": "LIABILITIES AND EQUITY" } } }, "localname": "LiabilitiesAndStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilitiesCurrent": { "auth_ref": [ "r50" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10010.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10010.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.", "label": "Liabilities Current", "totalLabel": "Total current liabilities" } } }, "localname": "LiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesCurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Liabilities Current [Abstract]", "terseLabel": "Current liabilities:" } } }, "localname": "LiabilitiesCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis": { "auth_ref": [ "r400" ], "lang": { "en-US": { "role": { "documentation": "Information by type of catastrophic event, for example, but not limited to, earthquake, windstorm, fire or explosion.", "label": "Liability For Catastrophe Claims By Catastrophic Event [Axis]", "terseLabel": "Catastrophic Event" } } }, "localname": "LiabilityForCatastropheClaimsByCatastrophicEventAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LineOfCreditFacilityAxis": { "auth_ref": [ "r46", "r119" ], "lang": { "en-US": { "role": { "documentation": "Information by name of lender, which may be a single entity (for example, but not limited to, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit.", "label": "Line Of Credit Facility [Axis]", "terseLabel": "Lender Name" } } }, "localname": "LineOfCreditFacilityAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity": { "auth_ref": [ "r46" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.", "label": "Line Of Credit Facility Current Borrowing Capacity", "terseLabel": "Minimum amount drawdown under credit facility" } } }, "localname": "LineOfCreditFacilityCurrentBorrowingCapacity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LineOfCreditFacilityDateOfFirstRequiredPayment1": { "auth_ref": [ "r46" ], "lang": { "en-US": { "role": { "documentation": "Date the first payment under the line of credit must be paid, in CCYY-MM-DD format.", "label": "Line Of Credit Facility Date Of First Required Payment1", "terseLabel": "Credit facility semiannual installments repayment beginning date" } } }, "localname": "LineOfCreditFacilityDateOfFirstRequiredPayment1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "us-gaap_LineOfCreditFacilityExpirationDate1": { "auth_ref": [ "r46" ], "lang": { "en-US": { "role": { "documentation": "Date the credit facility terminates, in CCYY-MM-DD format.", "label": "Line Of Credit Facility Expiration Date1", "terseLabel": "Credit facility, maturity date" } } }, "localname": "LineOfCreditFacilityExpirationDate1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "us-gaap_LineOfCreditFacilityLenderDomain": { "auth_ref": [ "r46" ], "lang": { "en-US": { "role": { "documentation": "Identification of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility.", "label": "Line Of Credit Facility Lender [Domain]", "terseLabel": "Line of Credit Facility, Lender" } } }, "localname": "LineOfCreditFacilityLenderDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity": { "auth_ref": [ "r46" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.", "label": "Line Of Credit Facility Maximum Borrowing Capacity", "terseLabel": "Credit Facility, maximum borrowing capacity" } } }, "localname": "LineOfCreditFacilityMaximumBorrowingCapacity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.", "label": "Line Of Credit Facility Unused Capacity Commitment Fee Percentage", "terseLabel": "Percentage of fee paid on unused credit facility" } } }, "localname": "LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_LoansAndLeasesReceivableCollateralForSecuredBorrowings": { "auth_ref": [ "r164", "r371" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing.", "label": "Loans And Leases Receivable Collateral For Secured Borrowings", "terseLabel": "Loans and Leases Receivable, Collateral for Secured Borrowings" } } }, "localname": "LoansAndLeasesReceivableCollateralForSecuredBorrowings", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LoansReceivableBasisSpreadOnVariableRate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.", "label": "Loans Receivable Basis Spread On Variable Rate", "terseLabel": "Credit facility basis spread on floating rate" } } }, "localname": "LoansReceivableBasisSpreadOnVariableRate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "us-gaap_LondonInterbankOfferedRateLIBORMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Interest rate at which a bank borrows funds from other banks in the London interbank market.", "label": "London Interbank Offered Rate L I B O R [Member]", "terseLabel": "LIBOR [Member]" } } }, "localname": "LondonInterbankOfferedRateLIBORMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_LongTermDebt": { "auth_ref": [ "r28", "r225", "r378", "r390" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.", "label": "Long Term Debt", "terseLabel": "Long-term debt", "totalLabel": "Total" } } }, "localname": "LongTermDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtAndCapitalLeaseObligations": { "auth_ref": [ "r28" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10020.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10020.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.", "label": "Long Term Debt And Capital Lease Obligations", "terseLabel": "Long-term debt due after one year" } } }, "localname": "LongTermDebtAndCapitalLeaseObligations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtByMaturityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Long Term Debt By Maturity [Abstract]" } } }, "localname": "LongTermDebtByMaturityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive": { "auth_ref": [ "r122", "r221" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10060.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long Term Debt Maturities Repayments Of Principal After Year Five", "terseLabel": "Thereafter" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive": { "auth_ref": [ "r122", "r221" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10050.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long Term Debt Maturities Repayments Of Principal In Year Five", "terseLabel": "Fiscal 2023" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour": { "auth_ref": [ "r122", "r221" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10040.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long Term Debt Maturities Repayments Of Principal In Year Four", "terseLabel": "Fiscal 2022" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree": { "auth_ref": [ "r122", "r221" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10030.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long Term Debt Maturities Repayments Of Principal In Year Three", "terseLabel": "Fiscal 2021" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo": { "auth_ref": [ "r122", "r221" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10020.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long Term Debt Maturities Repayments Of Principal In Year Two", "terseLabel": "Fiscal 2020" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear": { "auth_ref": [ "r122" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10010.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.", "label": "Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year", "terseLabel": "Remaining fiscal 2019" } } }, "localname": "LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermDebtNoncurrent": { "auth_ref": [ "r53" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails": { "order": 10020.0, "parentTag": "us-gaap_DebtLongtermAndShorttermCombinedAmount", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.", "label": "Long Term Debt Noncurrent", "terseLabel": "Long-term debt due after one year" } } }, "localname": "LongTermDebtNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongtermDebtTypeAxis": { "auth_ref": [ "r53" ], "lang": { "en-US": { "role": { "documentation": "Information by type of long-term debt.", "label": "Longterm Debt Type [Axis]", "terseLabel": "Long-term Debt, Type" } } }, "localname": "LongtermDebtTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "stringItemType" }, "us-gaap_LongtermDebtTypeDomain": { "auth_ref": [ "r53", "r222" ], "lang": { "en-US": { "role": { "documentation": "Type of long-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.", "label": "Longterm Debt Type [Domain]", "terseLabel": "Long-term Debt, Type" } } }, "localname": "LongtermDebtTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MachineryAndEquipmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.", "label": "Machinery And Equipment [Member]", "terseLabel": "Machinery and Equipment [Member]" } } }, "localname": "MachineryAndEquipmentMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MeasurementInputTypeAxis": { "auth_ref": [ "r353" ], "lang": { "en-US": { "role": { "documentation": "Information by type of measurement input used to determine value of asset and liability.", "label": "Measurement Input Type [Axis]", "terseLabel": "Measurement Input Type" } } }, "localname": "MeasurementInputTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "stringItemType" }, "us-gaap_MeasurementInputTypeDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement input used to determine value of asset and liability.", "label": "Measurement Input Type [Domain]", "terseLabel": "Measurement Input Type" } } }, "localname": "MeasurementInputTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MiningPropertiesAndMineralRightsMember": { "auth_ref": [ "r373" ], "lang": { "en-US": { "role": { "documentation": "Legal right to explore, extract, and retain some or all portions of the benefits from mining or mineral deposits and properties used for mining.", "label": "Mining Properties And Mineral Rights [Member]", "terseLabel": "Mineral Rights [Member]" } } }, "localname": "MiningPropertiesAndMineralRightsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_MinorityInterest": { "auth_ref": [ "r57", "r379", "r392" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10120.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).", "label": "Minority Interest", "terseLabel": "Noncontrolling interests" } } }, "localname": "MinorityInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_MultiemployerPlansWithdrawalObligation": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.", "label": "Multiemployer Plans Withdrawal Obligation", "terseLabel": "Multiemployer Plans, Withdrawal Obligation" } } }, "localname": "MultiemployerPlansWithdrawalObligation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivities": { "auth_ref": [ "r108" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10030.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.", "label": "Net Cash Provided By Used In Financing Activities", "totalLabel": "Net cash provided by (used for) financing activities" } } }, "localname": "NetCashProvidedByUsedInFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided By Used In Financing Activities [Abstract]", "terseLabel": "Financing activities:" } } }, "localname": "NetCashProvidedByUsedInFinancingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivities": { "auth_ref": [ "r108" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10020.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.", "label": "Net Cash Provided By Used In Investing Activities", "totalLabel": "Net cash used for investing activities" } } }, "localname": "NetCashProvidedByUsedInInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided By Used In Investing Activities [Abstract]", "terseLabel": "Investing activities:" } } }, "localname": "NetCashProvidedByUsedInInvestingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r108", "r110", "r113" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10010.0, "parentTag": "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.", "label": "Net Cash Provided By Used In Operating Activities", "totalLabel": "Net cash provided by operating activities", "verboseLabel": "Net cash provided by (used for) operating activities" } } }, "localname": "NetCashProvidedByUsedInOperatingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Net Cash Provided By Used In Operating Activities [Abstract]", "terseLabel": "Operating activities:" } } }, "localname": "NetCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_NetIncomeLoss": { "auth_ref": [ "r81", "r84", "r90", "r113", "r137", "r384", "r397" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": 10050.0, "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.", "label": "Net Income Loss", "terseLabel": "Net income attributable to common stockholders", "totalLabel": "Net income (loss) attributable to common stockholders" } } }, "localname": "NetIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetIncomeLossAttributableToNoncontrollingInterest": { "auth_ref": [ "r81", "r84", "r335", "r341" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10020.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of Net Income (Loss) attributable to noncontrolling interest.", "label": "Net Income Loss Attributable To Noncontrolling Interest", "negatedLabel": "Less: Net income attributable to noncontrolling interests", "negatedTerseLabel": "Net income" } } }, "localname": "NetIncomeLossAttributableToNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic": { "auth_ref": [ "r125", "r129" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.", "label": "Net Income Loss Available To Common Stockholders Basic", "totalLabel": "Net income attributable to common stockholders, basic" } } }, "localname": "NetIncomeLossAvailableToCommonStockholdersBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted": { "auth_ref": [ "r129", "r130" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.", "label": "Net Income Loss Available To Common Stockholders Diluted", "totalLabel": "Net income attributable to common stockholders, diluted" } } }, "localname": "NetIncomeLossAvailableToCommonStockholdersDiluted", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent": { "auth_ref": [ "r262" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10080.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.", "label": "Net Periodic Defined Benefits Expense Reversal Of Expense Excluding Service Cost Component", "negatedLabel": "Pension and other postretirement non-service income" } } }, "localname": "NetPeriodicDefinedBenefitsExpenseReversalOfExpenseExcludingServiceCostComponent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.", "label": "New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification", "terseLabel": "Adoption of revenue from contracts with customers standard" } } }, "localname": "NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "New Accounting Pronouncements Or Change In Accounting Principle [Line Items]", "terseLabel": "New Accounting Pronouncements Or Change In Accounting Principle [Line Items]" } } }, "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable": { "auth_ref": [ "r124", "r126", "r127" ], "lang": { "en-US": { "role": { "documentation": "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.", "label": "New Accounting Pronouncements Or Change In Accounting Principle [Table]", "terseLabel": "New Accounting Pronouncements Or Change In Accounting Principle [Table]" } } }, "localname": "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.", "label": "New Accounting Pronouncements Policy Policy [Text Block]", "terseLabel": "New Accounting Standards - Recently Adopted" } } }, "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_NoncashInvestingAndFinancingItemsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Noncash Investing And Financing Items [Abstract]", "terseLabel": "Non-cash investing activities:" } } }, "localname": "NoncashInvestingAndFinancingItemsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" ], "xbrltype": "stringItemType" }, "us-gaap_NoncontrollingInterestMember": { "auth_ref": [ "r329" ], "lang": { "en-US": { "role": { "documentation": "This element represents that portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent. A noncontrolling interest is sometimes called a minority interest.", "label": "Noncontrolling Interest [Member]", "terseLabel": "Noncontrolling Interests [Member]" } } }, "localname": "NoncontrollingInterestMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "domainItemType" }, "us-gaap_NumberOfReportableSegments": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.", "label": "Number Of Reportable Segments", "terseLabel": "Number of reportable segments" } } }, "localname": "NumberOfReportableSegments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "us-gaap_OperatingIncomeLoss": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10010.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10050.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The net result for the period of deducting operating expenses from operating revenues.", "label": "Operating Income Loss", "totalLabel": "Operating profit (loss)" } } }, "localname": "OperatingIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingSegmentsMember": { "auth_ref": [ "r150", "r157" ], "lang": { "en-US": { "role": { "documentation": "Identifies components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.", "label": "Operating Segments [Member]", "terseLabel": "Operating Segments [Member]" } } }, "localname": "OperatingSegmentsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Organization Consolidation And Presentation Of Financial Statements [Abstract]" } } }, "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_OtherAssetImpairmentCharges": { "auth_ref": [ "r112", "r196" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10400.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.", "label": "Other Asset Impairment Charges", "terseLabel": "Other impairment adjustments" } } }, "localname": "OtherAssetImpairmentCharges", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherAssetsCurrent": { "auth_ref": [ "r63" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10350.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of current assets classified as other.", "label": "Other Assets Current", "terseLabel": "Other current assets" } } }, "localname": "OtherAssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherAssetsNoncurrent": { "auth_ref": [ "r44" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10290.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of noncurrent assets classified as other.", "label": "Other Assets Noncurrent", "terseLabel": "Other assets" } } }, "localname": "OtherAssetsNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax": { "auth_ref": [ "r72", "r74", "r276" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10100.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).", "label": "Other Comprehensive Income Defined Benefit Plan Net Prior Service Costs Credit Arising During Period Net Of Tax", "negatedLabel": "Prior service cost arising during the period" } } }, "localname": "OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract]", "terseLabel": "Defined benefit pension and other postretirement benefit plans:" } } }, "localname": "OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease [Abstract]", "terseLabel": "Derivatives:" } } }, "localname": "OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecreaseAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax": { "auth_ref": [ "r66", "r74", "r360", "r361", "r362", "r363" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10050.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.", "label": "Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax", "verboseLabel": "Foreign currency translation gain (loss)" } } }, "localname": "OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax": { "auth_ref": [ "r74", "r78", "r79", "r276" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10110.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.", "label": "Other Comprehensive Income Loss Amortization Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax", "terseLabel": "Amortization of prior service costs, Pre-Tax Amount" } } }, "localname": "OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax": { "auth_ref": [ "r74", "r78", "r79", "r276" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10110.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.", "label": "Other Comprehensive Income Loss Amortization Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax", "terseLabel": "Amortization and settlement recognition of prior service cost, included in pension cost", "totalLabel": "Amortization of prior service costs, Net of Tax" } } }, "localname": "OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax": { "auth_ref": [ "r75" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10120.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.", "label": "Other Comprehensive Income Loss Amortization Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax", "negatedLabel": "Amortization of prior service costs, Tax" } } }, "localname": "OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax": { "auth_ref": [ "r68" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10070.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.", "label": "Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax", "terseLabel": "Unrealized gain on available for sale security" } } }, "localname": "OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax": { "auth_ref": [ "r77", "r87" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails": { "order": 10010.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax, before reclassification adjustments of other comprehensive income (loss).", "label": "Other Comprehensive Income Loss Before Reclassifications Net Of Tax", "verboseLabel": "Other comprehensive (loss) income before reclassifications" } } }, "localname": "OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r82", "r85", "r87", "r234" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10040.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax and reclassification adjustments of other comprehensive income (loss).", "label": "Other Comprehensive Income Loss Net Of Tax", "totalLabel": "Other comprehensive income (loss), net of tax" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]", "terseLabel": "Other comprehensive income (loss), net of tax:" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "stringItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent": { "auth_ref": [ "r82", "r85", "r331", "r332", "r337" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of other comprehensive income (loss) attributable to parent entity.", "label": "Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent", "totalLabel": "Net current period other comprehensive income (loss)", "verboseLabel": "Other comprehensive income (loss), net of tax" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax": { "auth_ref": [ "r74", "r78", "r79", "r166" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10070.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Before Tax", "negatedLabel": "Available for sale security, before tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax": { "auth_ref": [ "r74", "r78", "r79", "r166" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10080.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Net Of Tax", "negatedLabel": "Reclassification adjustment of gain on available for sale security included in earnings", "negatedTotalLabel": "Available for sale security, net of tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax": { "auth_ref": [ "r75", "r166" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10080.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Tax", "terseLabel": "Available for sale security, tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax": { "auth_ref": [ "r74", "r78", "r79", "r348" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10030.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Before Tax", "negatedLabel": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax": { "auth_ref": [ "r74", "r78", "r79", "r343" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10060.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax", "negatedLabel": "Reclassification adjustment of net loss on cash flow hedges included in earnings", "negatedTotalLabel": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax": { "auth_ref": [ "r75" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10040.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Tax", "terseLabel": "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax": { "auth_ref": [ "r74", "r78", "r79" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10090.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans Before Tax", "terseLabel": "Defined Benefit Plans, before Tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax": { "auth_ref": [ "r74", "r78", "r79", "r276" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10130.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax", "negatedLabel": "Amortization of net actuarial loss, Pre-Tax Amount" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax": { "auth_ref": [ "r74", "r78", "r79", "r276" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10090.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax", "negatedLabel": "Amortization and settlement recognition of net actuarial loss, included in pension cost", "negatedTotalLabel": "Amortization and settlement recognition of net actuarial loss, included in pension cost" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax": { "auth_ref": [ "r75" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10140.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax", "terseLabel": "Amortization of net actuarial loss, Tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax": { "auth_ref": [ "r74", "r78", "r79", "r276" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net periodic benefit cost (credit) of defined benefit plan.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans Net Of Tax", "totalLabel": "Defined Benefit Plans, Net of Tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax": { "auth_ref": [ "r75", "r331" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10100.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.", "label": "Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans Tax", "negatedLabel": "Defined Benefit Plans, Tax" } } }, "localname": "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherCurrentLiabilitiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Primary financial statement caption encompassing other current liabilities.", "label": "Other Current Liabilities [Member]", "terseLabel": "Other Current Liabilities [Member]" } } }, "localname": "OtherCurrentLiabilitiesMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OtherLiabilitiesCurrent": { "auth_ref": [ "r20", "r21", "r49" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10210.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.", "label": "Other Liabilities Current", "terseLabel": "Other current liabilities" } } }, "localname": "OtherLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherLiabilitiesNoncurrent": { "auth_ref": [ "r54" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10080.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10070.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.", "label": "Other Liabilities Noncurrent", "terseLabel": "Other long-term liabilities" } } }, "localname": "OtherLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherNoncurrentLiabilitiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Primary financial statement caption encompassing other noncurrent liabilities.", "label": "Other Noncurrent Liabilities [Member]", "terseLabel": "Other Long Term Liabilities [Member]" } } }, "localname": "OtherNoncurrentLiabilitiesMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OtherNonoperatingIncomeExpense": { "auth_ref": [ "r93" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10090.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10060.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10090.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (expense) related to nonoperating activities, classified as other.", "label": "Other Nonoperating Income Expense", "terseLabel": "Other income (expense), net", "verboseLabel": "Other (expense) income, net" } } }, "localname": "OtherNonoperatingIncomeExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherOperatingActivitiesCashFlowStatement": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10420.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).", "label": "Other Operating Activities Cash Flow Statement", "terseLabel": "Other" } } }, "localname": "OtherOperatingActivitiesCashFlowStatement", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember": { "auth_ref": [ "r259", "r278", "r279", "r291" ], "lang": { "en-US": { "role": { "documentation": "Plan designed to provide other postretirement benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes pension benefits.", "label": "Other Postretirement Benefit Plans Defined Benefit [Member]", "terseLabel": "Other Postretirement Benefits Plan [Member]", "verboseLabel": "Other Postretirement Benefits Plan [Member]" } } }, "localname": "OtherPostretirementBenefitPlansDefinedBenefitMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "domainItemType" }, "us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent": { "auth_ref": [ "r29", "r260", "r261", "r267" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10050.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10040.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of liability, recognized in statement of financial position, for defined benefit other postretirement plan, classified as noncurrent. Excludes pension plan.", "label": "Other Postretirement Defined Benefit Plan Liabilities Noncurrent", "terseLabel": "Postretirement benefit liabilities, net of current portion" } } }, "localname": "OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherRestructuringCosts": { "auth_ref": [ "r112", "r204", "r209", "r212" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10090.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.", "label": "Other Restructuring Costs", "terseLabel": "Other costs" } } }, "localname": "OtherRestructuringCosts", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ParentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Portion of equity, or net assets, in the consolidated entity attributable, directly or indirectly, to the parent. Excludes noncontrolling interests.", "label": "Parent [Member]", "terseLabel": "Parent [Member]" } } }, "localname": "ParentMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic": { "auth_ref": [ "r132" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": 10060.0, "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.", "label": "Participating Securities Distributed And Undistributed Earnings Loss Basic", "negatedLabel": "Less: Distributed and undistributed income available to participating securities, Basic" } } }, "localname": "ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted": { "auth_ref": [ "r132" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": 10040.0, "parentTag": "us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method.", "label": "Participating Securities Distributed And Undistributed Earnings Loss Diluted", "negatedLabel": "Less: Distributed and undistributed income available to participating securities, Diluted" } } }, "localname": "ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsForProceedsFromOtherInvestingActivities": { "auth_ref": [ "r96", "r99", "r121" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10270.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash (inflow) outflow from investing activities classified as other.", "label": "Payments For Proceeds From Other Investing Activities", "negatedLabel": "Other" } } }, "localname": "PaymentsForProceedsFromOtherInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsForRepurchaseOfCommonStock": { "auth_ref": [ "r102" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10120.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow to reacquire common stock during the period.", "label": "Payments For Repurchase Of Common Stock", "negatedLabel": "Purchases of common stock", "verboseLabel": "Purchases of common stock" } } }, "localname": "PaymentsForRepurchaseOfCommonStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfDividendsCommonStock": { "auth_ref": [ "r102" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10130.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.", "label": "Payments Of Dividends Common Stock", "negatedLabel": "Cash dividends paid to stockholders" } } }, "localname": "PaymentsOfDividendsCommonStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfDividendsMinorityInterest": { "auth_ref": [ "r102" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10140.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.", "label": "Payments Of Dividends Minority Interest", "negatedLabel": "Cash distributions paid to noncontrolling interests" } } }, "localname": "PaymentsOfDividendsMinorityInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireBusinessesGross": { "auth_ref": [ "r97", "r325" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.", "label": "Payments To Acquire Businesses Gross", "terseLabel": "Consideration paid in cash" } } }, "localname": "PaymentsToAcquireBusinessesGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired": { "auth_ref": [ "r97" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10220.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.", "label": "Payments To Acquire Businesses Net Of Cash Acquired", "negatedLabel": "Cash paid related to business combinations, net of cash acquired" } } }, "localname": "PaymentsToAcquireBusinessesNetOfCashAcquired", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates": { "auth_ref": [ "r97" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10240.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).", "label": "Payments To Acquire Interest In Subsidiaries And Affiliates", "negatedLabel": "Investment in unconsolidated entities" } } }, "localname": "PaymentsToAcquireInterestInSubsidiariesAndAffiliates", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireProductiveAssets": { "auth_ref": [ "r98" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10210.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.", "label": "Payments To Acquire Productive Assets", "negatedLabel": "Capital expenditures" } } }, "localname": "PaymentsToAcquireProductiveAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PensionAndOtherPostretirementBenefitExpense": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10050.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cost (reversal of cost) for pension and other postretirement benefits.", "label": "Pension And Other Postretirement Benefit Expense", "negatedLabel": "Pension and other postretirement non- service (expense) income" } } }, "localname": "PensionAndOtherPostretirementBenefitExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock": { "auth_ref": [ "r292" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for pension and other postretirement benefits.", "label": "Pension And Other Postretirement Benefits Disclosure [Text Block]", "terseLabel": "Retirement Plans" } } }, "localname": "PensionAndOtherPostretirementBenefitsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlans" ], "xbrltype": "textBlockItemType" }, "us-gaap_PensionPlansDefinedBenefitMember": { "auth_ref": [ "r258", "r278", "r279", "r291" ], "lang": { "en-US": { "role": { "documentation": "Plan designed to provide participant with pension benefits. Includes, but is not limited to, defined benefit and defined contribution plans. Excludes other postretirement benefits.", "label": "Pension Plans Defined Benefit [Member]", "terseLabel": "Pension Plans, Defined Benefit [Member]", "verboseLabel": "Pension Plan [Member]" } } }, "localname": "PensionPlansDefinedBenefitMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "domainItemType" }, "us-gaap_PreferredStockParOrStatedValuePerShare": { "auth_ref": [ "r30" ], "lang": { "en-US": { "role": { "documentation": "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.", "label": "Preferred Stock Par Or Stated Value Per Share", "terseLabel": "Preferred Stock, Par or Stated Value Per Share" } } }, "localname": "PreferredStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_PreferredStockSharesAuthorized": { "auth_ref": [ "r30" ], "lang": { "en-US": { "role": { "documentation": "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.", "label": "Preferred Stock Shares Authorized", "terseLabel": "Preferred Stock, Shares Authorized" } } }, "localname": "PreferredStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_PreferredStockSharesOutstanding": { "auth_ref": [ "r30" ], "lang": { "en-US": { "role": { "documentation": "Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.", "label": "Preferred Stock Shares Outstanding", "terseLabel": "Preferred Stock, Shares Outstanding" } } }, "localname": "PreferredStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_PreferredStockValue": { "auth_ref": [ "r30" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10130.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.", "label": "Preferred Stock Value", "terseLabel": "Preferred stock, $0.01 par value; 30.0 million shares authorized; no shares outstanding" } } }, "localname": "PreferredStockValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromInsuranceSettlementInvestingActivities": { "auth_ref": [ "r96", "r107" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10260.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow for proceeds from settlement of insurance claim, classified as investing activities. Excludes insurance settlement classified as operating activities.", "label": "Proceeds From Insurance Settlement Investing Activities", "terseLabel": "Proceeds from property, plant and equipment insurance settlement" } } }, "localname": "ProceedsFromInsuranceSettlementInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfDebt": { "auth_ref": [ "r100" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10070.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.", "label": "Proceeds From Issuance Of Debt", "terseLabel": "Additions to debt" } } }, "localname": "ProceedsFromIssuanceOfDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfLongTermDebt": { "auth_ref": [ "r100" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10050.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.", "label": "Proceeds From Issuance Of Long Term Debt", "terseLabel": "Proceeds from issuance of notes" } } }, "localname": "ProceedsFromIssuanceOfLongTermDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromPaymentsForOtherFinancingActivities": { "auth_ref": [ "r101", "r104", "r121" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10150.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow (outflow) from financing activities classified as other.", "label": "Proceeds From Payments For Other Financing Activities", "terseLabel": "Other" } } }, "localname": "ProceedsFromPaymentsForOtherFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromRepaymentsOfCommercialPaper": { "auth_ref": [ "r100", "r103", "r115" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10090.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper.", "label": "Proceeds From Repayments Of Commercial Paper", "terseLabel": "Changes in commercial paper, net" } } }, "localname": "ProceedsFromRepaymentsOfCommercialPaper", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromRepaymentsOfLinesOfCredit": { "auth_ref": [ "r121" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10060.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).", "label": "Proceeds From Repayments Of Lines Of Credit", "terseLabel": "Additions to revolving credit facilities", "verboseLabel": "(Repayments) additions to revolving credit facilities" } } }, "localname": "ProceedsFromRepaymentsOfLinesOfCredit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess": { "auth_ref": [ "r100", "r103", "r115" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10100.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months.", "label": "Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less", "terseLabel": "Other financing additions (repayments), net" } } }, "localname": "ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleAndCollectionOfReceivables": { "auth_ref": [ "r96" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10230.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow associated with the proceeds from sale and collection of receivables during the period.", "label": "Proceeds From Sale And Collection Of Receivables", "terseLabel": "Cash receipts on sold trade receivables" } } }, "localname": "ProceedsFromSaleAndCollectionOfReceivables", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment": { "auth_ref": [ "r95" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10250.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.", "label": "Proceeds From Sale Of Property Plant And Equipment", "terseLabel": "Proceeds from sale of property, plant and equipment" } } }, "localname": "ProceedsFromSaleOfPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProfitLoss": { "auth_ref": [ "r81", "r84", "r106", "r154", "r158", "r331", "r334", "r336", "r341", "r342" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10320.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME": { "order": 10030.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10010.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.", "label": "Profit Loss", "terseLabel": "Consolidated net income", "totalLabel": "Consolidated net income (loss)" } } }, "localname": "ProfitLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Property Plant And Equipment [Abstract]" } } }, "localname": "PropertyPlantAndEquipmentAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentByTypeAxis": { "auth_ref": [ "r43", "r195" ], "lang": { "en-US": { "role": { "documentation": "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.", "label": "Property Plant And Equipment By Type [Axis]", "terseLabel": "Property, Plant and Equipment, Type" } } }, "localname": "PropertyPlantAndEquipmentByTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock": { "auth_ref": [ "r202" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.", "label": "Property Plant And Equipment Disclosure [Text Block]", "terseLabel": "Property, Plant and Equipment" } } }, "localname": "PropertyPlantAndEquipmentDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipment" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentGross": { "auth_ref": [ "r42", "r193" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails": { "order": 10010.0, "parentTag": "us-gaap_PropertyPlantAndEquipmentNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Property Plant And Equipment Gross", "terseLabel": "Property, plant and equipment, at cost" } } }, "localname": "PropertyPlantAndEquipmentGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentGrossAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Property Plant And Equipment Gross [Abstract]", "terseLabel": "Property, plant and equipment at cost:" } } }, "localname": "PropertyPlantAndEquipmentGrossAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Property Plant And Equipment [Line Items]", "terseLabel": "Property Plant And Equipment [Line Items]" } } }, "localname": "PropertyPlantAndEquipmentLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "stringItemType" }, "us-gaap_PropertyPlantAndEquipmentNet": { "auth_ref": [ "r23", "r24", "r195", "r394" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10240.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.", "label": "Property Plant And Equipment Net", "terseLabel": "Property, plant and equipment, net", "totalLabel": "Property, plant and equipment, net" } } }, "localname": "PropertyPlantAndEquipmentNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentTextBlock": { "auth_ref": [ "r23", "r195" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.", "label": "Property Plant And Equipment [Text Block]", "terseLabel": "Schedule of Property, Plant and Equipment" } } }, "localname": "PropertyPlantAndEquipmentTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_PropertyPlantAndEquipmentTypeDomain": { "auth_ref": [ "r23", "r193" ], "lang": { "en-US": { "role": { "documentation": "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.", "label": "Property Plant And Equipment Type [Domain]", "terseLabel": "Property, Plant and Equipment, Type" } } }, "localname": "PropertyPlantAndEquipmentTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RealEstateMember": { "auth_ref": [ "r252" ], "lang": { "en-US": { "role": { "documentation": "Property consisting of land, land improvement and buildings.", "label": "Real Estate [Member]", "terseLabel": "Real Estate [Member]" } } }, "localname": "RealEstateMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]", "terseLabel": "Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]" } } }, "localname": "ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax": { "auth_ref": [ "r77", "r80", "r87" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails": { "order": 10020.0, "parentTag": "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of reclassification adjustments of other comprehensive income (loss).", "label": "Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax", "negatedLabel": "Amounts reclassified from accumulated other comprehensive loss (income)" } } }, "localname": "ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about items reclassified out of accumulated other comprehensive income (loss).", "label": "Reclassification Out Of Accumulated Other Comprehensive Income [Table]", "terseLabel": "Reclassification Out Of Accumulated Other Comprehensive Income [Table]" } } }, "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).", "label": "Reclassification Out Of Accumulated Other Comprehensive Income Table [Text Block]", "terseLabel": "Summary of Reclassification out of Accumulated Other Comprehensive Loss" } } }, "localname": "ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.", "label": "Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward", "terseLabel": "Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]" } } }, "localname": "ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount": { "auth_ref": [ "r230", "r231", "r232", "r233" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10090.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10090.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.", "label": "Redeemable Noncontrolling Interest Equity Carrying Amount", "terseLabel": "Redeemable noncontrolling interests" } } }, "localname": "RedeemableNoncontrollingInterestEquityCarryingAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_RepaymentsOfDebt": { "auth_ref": [ "r103" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10080.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.", "label": "Repayments Of Debt", "negatedLabel": "Repayments of debt", "terseLabel": "Repayment of debt" } } }, "localname": "RepaymentsOfDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReportingUnitAxis": { "auth_ref": [ "r178", "r179" ], "lang": { "en-US": { "role": { "documentation": "Information by reporting unit.", "label": "Reporting Unit [Axis]", "terseLabel": "Reporting Unit" } } }, "localname": "ReportingUnitAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ReportingUnitDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Level of reporting at which goodwill is tested for impairment.", "label": "Reporting Unit [Domain]", "terseLabel": "Reporting Unit" } } }, "localname": "ReportingUnitDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RestructuringAndRelatedActivitiesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Restructuring And Related Activities [Abstract]" } } }, "localname": "RestructuringAndRelatedActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_RestructuringAndRelatedCostCostIncurredToDate1": { "auth_ref": [ "r205", "r206", "r211", "r213" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of costs incurred to date for the specified restructuring cost.", "label": "Restructuring And Related Cost Cost Incurred To Date1", "terseLabel": "Restructuring and Related Cost, Cost Incurred to Date" } } }, "localname": "RestructuringAndRelatedCostCostIncurredToDate1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestructuringAndRelatedCostExpectedCost1": { "auth_ref": [ "r205", "r206", "r211", "r213" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount expected to be recognized in earnings for the specified restructuring cost.", "label": "Restructuring And Related Cost Expected Cost1", "terseLabel": "Restructuring and Related Cost, Expected Cost" } } }, "localname": "RestructuringAndRelatedCostExpectedCost1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestructuringAndRelatedCostIncurredCost": { "auth_ref": [ "r205", "r206", "r211", "r213" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringAndOtherCostsDetails": { "order": 10010.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.", "label": "Restructuring And Related Cost Incurred Cost", "terseLabel": "Restructuring", "verboseLabel": "Restructuring and Related Cost, Incurred Cost" } } }, "localname": "RestructuringAndRelatedCostIncurredCost", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringAndOtherCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestructuringCostAndReserveAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of restructuring cost.", "label": "Restructuring Cost And Reserve [Axis]", "terseLabel": "Restructuring Type" } } }, "localname": "RestructuringCostAndReserveAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RestructuringCostAndReserveLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Restructuring Cost And Reserve [Line Items]", "terseLabel": "Restructuring Cost And Reserve [Line Items]" } } }, "localname": "RestructuringCostAndReserveLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RetainedEarningsAccumulatedDeficit": { "auth_ref": [ "r34", "r239", "r391" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10160.0, "parentTag": "us-gaap_StockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.", "label": "Retained Earnings Accumulated Deficit", "terseLabel": "Retained earnings", "verboseLabel": "Retained earnings" } } }, "localname": "RetainedEarningsAccumulatedDeficit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "us-gaap_RetainedEarningsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The cumulative amount of the reporting entity's undistributed earnings or deficit.", "label": "Retained Earnings [Member]", "terseLabel": "Retained Earnings [Member]" } } }, "localname": "RetainedEarningsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "domainItemType" }, "us-gaap_RetirementPlanNameAxis": { "auth_ref": [ "r279" ], "lang": { "en-US": { "role": { "documentation": "Information by name of plan designed to provide retirement benefits. Includes, but is not limited to, legal name of defined benefit and defined contribution plans.", "label": "Retirement Plan Name [Axis]", "terseLabel": "Retirement Plan Name" } } }, "localname": "RetirementPlanNameAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RetirementPlanNameDomain": { "auth_ref": [ "r279" ], "lang": { "en-US": { "role": { "documentation": "Name of plan designed to provide retirement benefits. Includes, but is not limited to, legal name of defined benefit and defined contribution plans.", "label": "Retirement Plan Name [Domain]", "terseLabel": "Retirement Plan Name" } } }, "localname": "RetirementPlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RetirementPlanTypeAxis": { "auth_ref": [ "r258", "r259", "r278", "r279", "r291" ], "lang": { "en-US": { "role": { "documentation": "Information by type of retirement benefit plan. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.", "label": "Retirement Plan Type [Axis]", "terseLabel": "Retirement Plan Type" } } }, "localname": "RetirementPlanTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RetirementPlanTypeDomain": { "auth_ref": [ "r258", "r259", "r278", "r279", "r291" ], "lang": { "en-US": { "role": { "documentation": "Type of plan designed to provide participants with retirement benefits. Includes, but is not limited to, retirement benefit arrangement for defined benefit pension and other postretirement plans, retirement benefit arrangement for defined contribution pension and other postretirement plans, and special and contractual termination benefits payable upon retirement.", "label": "Retirement Plan Type [Domain]", "terseLabel": "Retirement Plan Type" } } }, "localname": "RetirementPlanTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "domainItemType" }, "us-gaap_RevenueFromContractWithCustomerAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Revenue From Contract With Customer [Abstract]" } } }, "localname": "RevenueFromContractWithCustomerAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax": { "auth_ref": [ "r245", "r249", "r250" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10110.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.", "label": "Revenue From Contract With Customer Excluding Assessed Tax", "terseLabel": "Net sales", "verboseLabel": "Net sales" } } }, "localname": "RevenueFromContractWithCustomerExcludingAssessedTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_RevenueFromContractWithCustomerTextBlock": { "auth_ref": [ "r123", "r257" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.", "label": "Revenue From Contract With Customer [Text Block]", "terseLabel": "Revenue Recognition" } } }, "localname": "RevenueFromContractWithCustomerTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognition" ], "xbrltype": "textBlockItemType" }, "us-gaap_RevenuePerformanceObligationSatisfiedAtPointInTimeTransferOfControl": { "auth_ref": [ "r248" ], "lang": { "en-US": { "role": { "documentation": "Description of judgment made in evaluating when customer obtains control of promised good or service for performance obligation satisfied at point in time.", "label": "Revenue Performance Obligation Satisfied At Point In Time Transfer Of Control", "terseLabel": "Revenue, performance obligation satisfied at point in time" } } }, "localname": "RevenuePerformanceObligationSatisfiedAtPointInTimeTransferOfControl", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_RevenuePracticalExpedientRemainingPerformanceObligation": { "auth_ref": [ "r247" ], "lang": { "en-US": { "role": { "documentation": "Indicates (true false) whether optional exemption was applied not to disclose amount of transaction price allocated to and explanation of expected timing of revenue recognition for remaining performance obligation, when contract has expected duration of one year or less or right to consideration corresponds directly to performance completed.", "label": "Revenue Practical Expedient Remaining Performance Obligation", "terseLabel": "Revenue performance obligation, practical expedient" } } }, "localname": "RevenuePracticalExpedientRemainingPerformanceObligation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails" ], "xbrltype": "booleanItemType" }, "us-gaap_RevolvingCreditFacilityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.", "label": "Revolving Credit Facility [Member]", "terseLabel": "Revolving Credit Facility [Member]" } } }, "localname": "RevolvingCreditFacilityMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable": { "auth_ref": [ "r182" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the major classes of acquired finite-lived intangible assets showing the amount, any significant residual value, weighted average amortization period, and other characteristics. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company.", "label": "Schedule Of Acquired Finite Lived Intangible Asset By Major Class [Table]", "terseLabel": "Schedule Of Acquired Finite Lived Intangible Asset By Major Class [Table]" } } }, "localname": "ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable": { "auth_ref": [ "r317", "r318" ], "lang": { "en-US": { "role": { "documentation": "Schedule reflecting each material business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities.", "label": "Schedule Of Business Acquisitions By Acquisition [Table]", "terseLabel": "Schedule Of Business Acquisitions By Acquisition [Table]" } } }, "localname": "ScheduleOfBusinessAcquisitionsByAcquisitionTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock": { "auth_ref": [ "r317", "r318" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts.", "label": "Schedule Of Business Acquisitions By Acquisition [Text Block]", "terseLabel": "Summary of Fair Values of Assets Acquired and Liabilities Assumed by Major of assets and Liabilities and Measurement Period Adjustments" } } }, "localname": "ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of supplemental cash flow information for the periods presented.", "label": "Schedule Of Cash Flow Supplemental Disclosures Table [Text Block]", "terseLabel": "Summary of Non-Cash Transactions" } } }, "localname": "ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfDebtInstrumentsTextBlock": { "auth_ref": [ "r53", "r119", "r235", "r236", "r237", "r238", "r364", "r365", "r367", "r386" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.", "label": "Schedule Of Debt Instruments [Text Block]", "terseLabel": "Schedule of Carrying Value of Individual Components of Debt" } } }, "localname": "ScheduleOfDebtInstrumentsTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable": { "auth_ref": [ "r278", "r279", "r280", "r281", "r289" ], "lang": { "en-US": { "role": { "documentation": "Disclosures about an individual defined benefit pension plan or an other postretirement defined benefit plan. It may be appropriate to group certain similar plans. Also includes schedule for fair value of plan assets by major categories of plan assets by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), Significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).", "label": "Schedule Of Defined Benefit Plans Disclosures [Table]", "terseLabel": "Schedule Of Defined Benefit Plans Disclosures [Table]" } } }, "localname": "ScheduleOfDefinedBenefitPlansDisclosuresTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": { "auth_ref": [ "r137" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.", "label": "Schedule Of Earnings Per Share Basic And Diluted Table [Text Block]", "terseLabel": "Schedule of Earnings Per Share, Basic and Diluted" } } }, "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTextBlock": { "auth_ref": [ "r182" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of finite-lived intangible assets acquired as part of a business combination or through an asset purchase, by major class and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period.", "label": "Schedule Of Finite Lived Intangible Assets Acquired As Part Of Business Combination [Text Block]", "terseLabel": "Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination" } } }, "localname": "ScheduleOfFiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfGoodwillTextBlock": { "auth_ref": [ "r177", "r180" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.", "label": "Schedule Of Goodwill [Text Block]", "terseLabel": "Changes in Carrying Amount of Goodwill" } } }, "localname": "ScheduleOfGoodwillTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfInventoryCurrentTableTextBlock": { "auth_ref": [ "r22", "r38", "r39", "r40" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.", "label": "Schedule Of Inventory Current Table [Text Block]", "terseLabel": "Schedule of Inventories" } } }, "localname": "ScheduleOfInventoryCurrentTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock": { "auth_ref": [ "r221" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.", "label": "Schedule Of Maturities Of Long Term Debt Table [Text Block]", "terseLabel": "Schedule of aggregate maturities of debt" } } }, "localname": "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfNetBenefitCostsTableTextBlock": { "auth_ref": [ "r270" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.", "label": "Schedule Of Net Benefit Costs Table [Text Block]", "terseLabel": "Summary of Components of Net Pension (Income) Cost and Summary of Components of Postretirement Benefit Cost" } } }, "localname": "ScheduleOfNetBenefitCostsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock": { "auth_ref": [ "r124", "r126", "r127", "r140", "r141", "r142" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.", "label": "Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Text Block]", "terseLabel": "Summary of Effect of Adoption of ASC 606 Impact on Condensed Consolidated Financial Statements" } } }, "localname": "ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfPropertyPlantAndEquipmentTable": { "auth_ref": [ "r43", "r195" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of information about physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.", "label": "Schedule Of Property Plant And Equipment [Table]", "terseLabel": "Schedule Of Property Plant And Equipment [Table]" } } }, "localname": "ScheduleOfPropertyPlantAndEquipmentTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfRestructuringAndRelatedCostsTable": { "auth_ref": [ "r207", "r208", "r210" ], "lang": { "en-US": { "role": { "documentation": "Table presenting the description of the restructuring costs, such as the expected cost; the costs incurred during the period; the cumulative costs incurred as of the balance sheet date; the income statement caption within which the restructuring charges recognized for the period are included; and the amount of and periodic changes to an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost by type of restructuring.", "label": "Schedule Of Restructuring And Related Costs [Table]", "terseLabel": "Schedule Of Restructuring And Related Costs [Table]" } } }, "localname": "ScheduleOfRestructuringAndRelatedCostsTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock": { "auth_ref": [ "r207", "r208", "r210" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets.", "label": "Schedule Of Restructuring And Related Costs [Text Block]", "terseLabel": "Schedule of Restructuring Charges Related to Active Restructuring Initiatives" } } }, "localname": "ScheduleOfRestructuringAndRelatedCostsTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable": { "auth_ref": [ "r149", "r154", "r155", "r156", "r177" ], "lang": { "en-US": { "role": { "documentation": "A table disclosing the profit or loss and total assets for each reportable segment of the entity. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.", "label": "Schedule Of Segment Reporting Information By Segment [Table]", "terseLabel": "Schedule Of Segment Reporting Information By Segment [Table]" } } }, "localname": "ScheduleOfSegmentReportingInformationBySegmentTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock": { "auth_ref": [ "r149", "r154", "r155", "r156", "r177" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.", "label": "Schedule Of Segment Reporting Information By Segment [Text Block]", "terseLabel": "Certain Operating Data for Segments" } } }, "localname": "ScheduleOfSegmentReportingInformationBySegmentTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_SecuredDebtMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity's assets.", "label": "Secured Debt [Member]", "terseLabel": "Secured Debt [Member]" } } }, "localname": "SecuredDebtMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SegmentDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.", "label": "Segment [Domain]", "terseLabel": "Segments" } } }, "localname": "SegmentDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "domainItemType" }, "us-gaap_SegmentReportingAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Segment Reporting [Abstract]" } } }, "localname": "SegmentReportingAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_SegmentReportingDisclosureTextBlock": { "auth_ref": [ "r162" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.", "label": "Segment Reporting Disclosure [Text Block]", "terseLabel": "Segment Information" } } }, "localname": "SegmentReportingDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformation" ], "xbrltype": "textBlockItemType" }, "us-gaap_SegmentReportingInformationLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Segment Reporting Information [Line Items]", "terseLabel": "Segment Reporting Information [Line Items]" } } }, "localname": "SegmentReportingInformationLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensation": { "auth_ref": [ "r111" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10360.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.", "label": "Share Based Compensation", "terseLabel": "Share-based compensation expense" } } }, "localname": "ShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShortTermDebtTypeAxis": { "auth_ref": [ "r47" ], "lang": { "en-US": { "role": { "documentation": "Information by type of short-term debt arrangement.", "label": "Short Term Debt Type [Axis]", "terseLabel": "Short-term Debt, Type" } } }, "localname": "ShortTermDebtTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_ShortTermDebtTypeDomain": { "auth_ref": [ "r45" ], "lang": { "en-US": { "role": { "documentation": "Type of short-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.", "label": "Short Term Debt Type [Domain]", "terseLabel": "Short-term Debt, Type" } } }, "localname": "ShortTermDebtTypeDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_StatementBusinessSegmentsAxis": { "auth_ref": [ "r3", "r154", "r177", "r199", "r206", "r213", "r401" ], "lang": { "en-US": { "role": { "documentation": "Information by business segments.", "label": "Statement Business Segments [Axis]", "terseLabel": "Segments" } } }, "localname": "StatementBusinessSegmentsAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "stringItemType" }, "us-gaap_StatementEquityComponentsAxis": { "auth_ref": [ "r56", "r234" ], "lang": { "en-US": { "role": { "documentation": "Information by component of equity.", "label": "Statement Equity Components [Axis]", "terseLabel": "Equity Components" } } }, "localname": "StatementEquityComponentsAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossScheduleOfChangesInAccumulatedOtherComprehensiveLossNetOfTaxDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "stringItemType" }, "us-gaap_StatementLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.", "label": "Statement [Line Items]", "terseLabel": "Statement [Line Items]" } } }, "localname": "StatementLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" ], "xbrltype": "stringItemType" }, "us-gaap_StatementOfCashFlowsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Statement Of Cash Flows [Abstract]" } } }, "localname": "StatementOfCashFlowsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementOfFinancialPositionAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Statement Of Financial Position [Abstract]" } } }, "localname": "StatementOfFinancialPositionAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Statement Of Income And Comprehensive Income [Abstract]" } } }, "localname": "StatementOfIncomeAndComprehensiveIncomeAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementOfStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Statement Of Stockholders Equity [Abstract]" } } }, "localname": "StatementOfStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_StatementTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.", "label": "Statement [Table]", "terseLabel": "Statement [Table]" } } }, "localname": "StatementTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" ], "xbrltype": "stringItemType" }, "us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross": { "auth_ref": [ "r234", "r239" ], "lang": { "en-US": { "role": { "documentation": "Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.", "label": "Stock Issued During Period Shares Restricted Stock Award Gross", "terseLabel": "Shares issued under restricted stock plan" } } }, "localname": "StockIssuedDuringPeriodSharesRestrictedStockAwardGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "sharesItemType" }, "us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.", "label": "Stock Repurchase Program Number Of Shares Authorized To Be Repurchased", "terseLabel": "Stock repurchase program, number of shares authorized to be repurchased" } } }, "localname": "StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.", "label": "Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased", "terseLabel": "Stock repurchase program, remaining number of shares authorized to be repurchased" } } }, "localname": "StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_StockholdersEquity": { "auth_ref": [ "r31", "r35", "r36", "r165" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10110.0, "parentTag": "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.", "label": "Stockholders Equity", "periodEndLabel": "Total Stockholders\u2019 equity", "terseLabel": "Total stockholders\u2019 equity", "totalLabel": "Total stockholders\u2019 equity" } } }, "localname": "StockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest": { "auth_ref": [ "r329", "r330", "r340" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10100.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10100.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.", "label": "Stockholders Equity Including Portion Attributable To Noncontrolling Interest", "periodEndLabel": "Ending balance", "periodStartLabel": "Beginning balance", "totalLabel": "Total equity" } } }, "localname": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityNoteDisclosureTextBlock": { "auth_ref": [ "r241" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.", "label": "Stockholders Equity Note Disclosure [Text Block]", "terseLabel": "Equity and Other Comprehensive Income (Loss)" } } }, "localname": "StockholdersEquityNoteDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLoss" ], "xbrltype": "textBlockItemType" }, "us-gaap_SummaryOfIncomeTaxContingenciesTextBlock": { "auth_ref": [ "r303", "r308", "r309" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months.", "label": "Summary Of Income Tax Contingencies [Text Block]", "terseLabel": "Summary of Changes in Reserve for Uncertain Tax Position" } } }, "localname": "SummaryOfIncomeTaxContingenciesTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_SupplementalCashFlowInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Supplemental Cash Flow Information [Abstract]", "terseLabel": "Supplemental disclosure of cash flow information:" } } }, "localname": "SupplementalCashFlowInformationAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "stringItemType" }, "us-gaap_TangibleAssetImpairmentCharges": { "auth_ref": [ "r2", "r196" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10040.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10390.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10170.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.", "label": "Tangible Asset Impairment Charges", "negatedLabel": "Land and Development impairments", "terseLabel": "Land and Development impairments" } } }, "localname": "TangibleAssetImpairmentCharges", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "us-gaap_TrademarksAndTradeNamesMember": { "auth_ref": [ "r321" ], "lang": { "en-US": { "role": { "documentation": "Rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style, or rights either acquired through registration of a business name to gain or protect exclusive use thereof.", "label": "Trademarks And Trade Names [Member]", "terseLabel": "Trademarks and Tradenames [Member]" } } }, "localname": "TrademarksAndTradeNamesMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds": { "auth_ref": [ "r369" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the initial fair value recorded for assets received on transfer of financial assets in a securitization, asset-backed financing arrangement, or a similar transfer which transaction is recognized as a sale of the transferred financial assets.", "label": "Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds", "periodStartLabel": "Receivables sold to the financial institution and derecognized" } } }, "localname": "TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceeds", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueSummaryOfActivityUnderARSalesAgreementDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_TransportationEquipmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equipment used for the primary purpose of moving people and products from one place to another.", "label": "Transportation Equipment [Member]", "terseLabel": "Transportation Equipment [Member]" } } }, "localname": "TransportationEquipmentMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "us-gaap_TreasuryStockSharesAcquired": { "auth_ref": [ "r31", "r234", "r239" ], "lang": { "en-US": { "role": { "documentation": "Number of shares that have been repurchased during the period and are being held in treasury.", "label": "Treasury Stock Shares Acquired", "negatedLabel": "Purchases of common stock", "verboseLabel": "Treasury stock, shares, acquired" } } }, "localname": "TreasuryStockSharesAcquired", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "sharesItemType" }, "us-gaap_TreasuryStockValueAcquiredParValueMethod": { "auth_ref": [ "r234", "r239", "r240" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.", "label": "Treasury Stock Value Acquired Par Value Method", "negatedLabel": "Purchases of common stock" } } }, "localname": "TreasuryStockValueAcquiredParValueMethod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "us-gaap_TypeOfAdoptionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Adoption and early adoption of sources of change to generally accepted accounting principles (GAAP) in the United States. The FASB released the FASB Accounting Standards Codification as the authoritative source of literature effective for interim and annual periods ending after September 15, 2009. As part of the Codification process, the FASB issues Accounting Standards Updates to amend the Codification but otherwise the Accounting Standards Updates are not authoritative in their own right. All previous accounting standards (such as FASB Statements of Financial Accounting Standards, FASB Interpretations, FASB Staff Positions, Emerging Issues Task Force Consensuses, other pronouncements of the FASB or other designated bodies, or other forms of GAAP are considered accounting pronouncements) were superseded upon the adoption of the Codification. For an interim period, references to the superseded standards are included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.", "label": "Type Of Adoption [Member]", "terseLabel": "Type of Adoption" } } }, "localname": "TypeOfAdoptionMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedBalanceSheetDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfEffectOfAdoptionOfASC606ImpactOnCondensedConsolidatedStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionTables" ], "xbrltype": "domainItemType" }, "us-gaap_TypeOfRestructuringDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Identification of the types of restructuring costs.", "label": "Type Of Restructuring [Domain]", "terseLabel": "Type of Restructuring" } } }, "localname": "TypeOfRestructuringDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "domainItemType" }, "us-gaap_UnrecognizedTaxBenefits": { "auth_ref": [ "r297", "r304" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of unrecognized tax benefits.", "label": "Unrecognized Tax Benefits", "periodEndLabel": "Balance at end of period", "periodStartLabel": "Balance at beginning of fiscal year" } } }, "localname": "UnrecognizedTaxBenefits", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in unrecognized tax benefits resulting from acquisitions.", "label": "Unrecognized Tax Benefits Increases Resulting From Acquisition", "terseLabel": "Additions related to purchase accounting" } } }, "localname": "UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions": { "auth_ref": [ "r306" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.", "label": "Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions", "terseLabel": "Additions for tax positions taken in current year" } } }, "localname": "UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation": { "auth_ref": [ "r304" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in unrecognized tax benefits resulting from foreign currency translation.", "label": "Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation", "terseLabel": "Additions for currency translation adjustments" } } }, "localname": "UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions": { "auth_ref": [ "r305" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.", "label": "Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions", "terseLabel": "Additions for tax positions taken in prior fiscal years" } } }, "localname": "UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations": { "auth_ref": [ "r307" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.", "label": "Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations", "negatedLabel": "Reductions as a result of a lapse of the applicable statute of limitations" } } }, "localname": "UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangesInReserveForUncertainTaxPositionDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_UnsecuredDebtMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Debt obligation not collateralized by pledge of, mortgage of or other lien on the entity's assets.", "label": "Unsecured Debt [Member]", "terseLabel": "Unsecured Debt [Member]" } } }, "localname": "UnsecuredDebtMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "us-gaap_UnusualOrInfrequentItemInsuranceProceeds": { "auth_ref": [ "r94" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both.", "label": "Unusual Or Infrequent Item Insurance Proceeds", "terseLabel": "Insurance proceeds recieved" } } }, "localname": "UnusualOrInfrequentItemInsuranceProceeds", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "us-gaap_VariableRateAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of variable rate.", "label": "Variable Rate [Axis]", "terseLabel": "Variable Rate" } } }, "localname": "VariableRateAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "us-gaap_VariableRateDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.", "label": "Variable Rate [Domain]", "terseLabel": "Variable Rate" } } }, "localname": "VariableRateDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment": { "auth_ref": [ "r135" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": 10020.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.", "label": "Weighted Average Number Diluted Shares Outstanding Adjustment", "terseLabel": "Effect of dilutive stock options and non- participating securities" } } }, "localname": "WeightedAverageNumberDilutedSharesOutstandingAdjustment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": { "auth_ref": [ "r130", "r135" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "lang": { "en-US": { "role": { "documentation": "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.", "label": "Weighted Average Number Of Diluted Shares Outstanding", "terseLabel": "Diluted weighted average shares outstanding", "totalLabel": "Diluted weighted average shares outstanding" } } }, "localname": "WeightedAverageNumberOfDilutedSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": { "auth_ref": [ "r128", "r135" ], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails": { "order": 10010.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.", "label": "Weighted Average Number Of Shares Outstanding Basic", "terseLabel": "Basic weighted average shares outstanding" } } }, "localname": "WeightedAverageNumberOfSharesOutstandingBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEarningsPerShareScheduleOfEarningsPerShareBasicAndDilutedDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "sharesItemType" }, "wrk_AccountingStandardsUpdate201615And201618Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Accounting Standards Update 2016-15 and 2016-18.", "label": "Accounting Standards Update201615 And201618 [Member]", "terseLabel": "ASU 2016-15 and 2016-18 [Member]" } } }, "localname": "AccountingStandardsUpdate201615And201618Member", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_AccumulatedOtherComprehensiveIncomeLossTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Accumulated other comprehensive income (loss).", "label": "Accumulated Other Comprehensive Income Loss Table [Text Block]", "terseLabel": "Schedule of Changes in Accumulated Other Comprehensive Loss, Net of Tax" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossTableTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossTables" ], "xbrltype": "textBlockItemType" }, "wrk_AcquisitionsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Acquisitions [Abstract]", "label": "Acquisitions [Abstract]" } } }, "localname": "AcquisitionsAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_AdditionalAccrualsAndAdjustmentsToAccruals": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10010.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Additional accruals and adjustments to accruals.", "label": "Additional Accruals And Adjustments To Accruals", "terseLabel": "Additional accruals and adjustments to accruals (see table above)" } } }, "localname": "AdditionalAccrualsAndAdjustmentsToAccruals", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_AdjustmenttoFairValueDebtAssumedinBusinessCombination": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10080.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Adjustment to Fair Value Debt Assumed in Business Combination", "label": "Adjustmentto Fair Value Debt Assumedin Business Combination", "terseLabel": "Fair value step-up" } } }, "localname": "AdjustmenttoFairValueDebtAssumedinBusinessCombination", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "wrk_AggregatePrincipalAmountOfShortTermUnsecuredCommercialPaperProgramMaximum": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate principal amount of short-term unsecured commercial paper program maximum.", "label": "Aggregate Principal Amount Of Short Term Unsecured Commercial Paper Program Maximum", "terseLabel": "Aggregate Principal Amount of Short-term Unsecured Commercial Paper Program, Maximum" } } }, "localname": "AggregatePrincipalAmountOfShortTermUnsecuredCommercialPaperProgramMaximum", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_AsAdjustedMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "As adjusted.", "label": "As Adjusted [Member]", "terseLabel": "As Adjusted [Member]" } } }, "localname": "AsAdjustedMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "domainItemType" }, "wrk_AssetsHeldForSaleAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Assets Held for Sale.", "label": "Assets Held For Sale [Abstract]" } } }, "localname": "AssetsHeldForSaleAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_AssetsHeldForSaleTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.", "label": "Assets Held For Sale [Text Block]", "terseLabel": "Assets Held for Sale" } } }, "localname": "AssetsHeldForSaleTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSale" ], "xbrltype": "textBlockItemType" }, "wrk_AuthorizedShareRepurchaseAsAPercentageOfCommonStockOutstanding": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Authorized share repurchase as a percentage of common stock outstanding.", "label": "Authorized Share Repurchase As A Percentage Of Common Stock Outstanding", "terseLabel": "Authorized share repurchase as a percentage of common stock outstanding" } } }, "localname": "AuthorizedShareRepurchaseAsAPercentageOfCommonStockOutstanding", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_BankOfAmericaMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Bank of America.", "label": "Bank Of America [Member]", "terseLabel": "Bank of America, N.A [Member]" } } }, "localname": "BankOfAmericaMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_BorrowingsOutstanding": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Borrowings outstanding.", "label": "Borrowings Outstanding", "terseLabel": "Borrowings outstanding" } } }, "localname": "BorrowingsOutstanding", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_BrazilDelayedDrawCreditFacilitiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Brazil delayed draw credit facilities.", "label": "Brazil Delayed Draw Credit Facilities [Member]", "terseLabel": "Brazil Delayed Draw Credit Facilities [Member]" } } }, "localname": "BrazilDelayedDrawCreditFacilitiesMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_BusinessAcquisitionPercentageOfEquityInterestsThenOutstandingIssuedOrIssuable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Business acquisition percentage of equity interests then outstanding issued or issuable.", "label": "Business Acquisition Percentage Of Equity Interests Then Outstanding Issued Or Issuable", "terseLabel": "Business acquisition, percentage of equity interest on shares issued and outsanding" } } }, "localname": "BusinessAcquisitionPercentageOfEquityInterestsThenOutstandingIssuedOrIssuable", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_BusinessCombinationDeferredPaymentAndTaxMakeWholePaymentAndUnpaidOrUnreceivedWorkingCapital": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1": { "order": 10050.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Business combination deferred payment and tax make whole payment and unpaid or unreceived working capital.", "label": "Business Combination Deferred Payment And Tax Make Whole Payment And Unpaid Or Unreceived Working Capital", "terseLabel": "Deferred payments and unpaid working capital" } } }, "localname": "BusinessCombinationDeferredPaymentAndTaxMakeWholePaymentAndUnpaidOrUnreceivedWorkingCapital", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1" ], "xbrltype": "monetaryItemType" }, "wrk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedPensionAndOtherLongTermBenefits": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10060.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Business combination recognized identifiable assets acquired and liabilities assumed accrued pension and other long-term benefits.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued Pension And Other Long Term Benefits", "terseLabel": "Accrued pension and other long-term benefits" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedPensionAndOtherLongTermBenefits", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsExcludingCashAndCashEquivalents": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails": { "order": 10100.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Business combination recognized identifiable assets acquired and liabilities assumed current assets excluding cash and cash equivalents.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Excluding Cash And Cash Equivalents", "terseLabel": "Current assets, excluding cash and cash equivalents" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsExcludingCashAndCashEquivalents", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCashPaidNetofCashAcquired": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1": { "order": 10020.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Business combination recognized identifiable assets acquired and liabilities assumed cash paid net of cash acquired.", "label": "Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Cash Paid Netof Cash Acquired", "terseLabel": "Cash consideration for the purchase of businesses, net of cash acquired" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCashPaidNetofCashAcquired", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1" ], "xbrltype": "monetaryItemType" }, "wrk_CashReceiptsOnSoldTradeReceivablesFromASU201615Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Cash receipts on sold trade receivables from ASU 2016-15.", "label": "Cash Receipts On Sold Trade Receivables From A S U201615 [Member]", "terseLabel": "Cash Receipts on Sold Trade Receivables From ASU 2016-15 [Member]" } } }, "localname": "CashReceiptsOnSoldTradeReceivablesFromASU201615Member", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_CommitmentsAndContingenciesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commitments and contingencies.", "label": "Commitments And Contingencies [Abstract]" } } }, "localname": "CommitmentsAndContingenciesAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_CommitmentsAndContingenciesLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commitments and contingencies.", "label": "Commitments And Contingencies [Line Items]", "terseLabel": "Commitments and Contingencies [Line Items]" } } }, "localname": "CommitmentsAndContingenciesLineItems", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "wrk_CommitmentsAndContingenciesTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Commitments and contingencies.", "label": "Commitments And Contingencies [Table]", "terseLabel": "Commitments And Contingencies [Table]" } } }, "localname": "CommitmentsAndContingenciesTable", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "stringItemType" }, "wrk_CondensedConsolidatedStatementsOfCashFlowsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Condensed Consolidated Statements of Cash Flows [Abstract]", "label": "Condensed Consolidated Statements Of Cash Flows [Abstract]" } } }, "localname": "CondensedConsolidatedStatementsOfCashFlowsAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_ConsolidatedStatementsOfEquityParentheticalInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Phantom Tags [Abstract]", "label": "Consolidated Statements Of Equity Parenthetical Information [Abstract]" } } }, "localname": "ConsolidatedStatementsOfEquityParentheticalInformationAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_ConsumerPackagingMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Consumer packaging.", "label": "Consumer Packaging [Member]", "terseLabel": "Consumer Packaging [Member]" } } }, "localname": "ConsumerPackagingMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "domainItemType" }, "wrk_CooperatieveRabobankUANewYorkBranchRevolvingLineofCreditMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Cooperatieve Rabobank U.A., New York Branch Revolving Line of Credit [Member]", "label": "Cooperatieve Rabobank U A New York Branch Revolving Lineof Credit [Member]", "terseLabel": "Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member]" } } }, "localname": "CooperatieveRabobankUANewYorkBranchRevolvingLineofCreditMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_CorrugatedPackagingMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Corrugated packaging.", "label": "Corrugated Packaging [Member]", "terseLabel": "Corrugated Packaging [Member]" } } }, "localname": "CorrugatedPackagingMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "domainItemType" }, "wrk_CostOfRealEstateSold": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10340.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Cost of real estate sold.", "label": "Cost Of Real Estate Sold", "terseLabel": "Cost of real estate sold" } } }, "localname": "CostOfRealEstateSold", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "wrk_DebtAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Debt.", "label": "Debt [Abstract]" } } }, "localname": "DebtAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_DebtInstrumentAmendedMaturityDate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Debt instrument amended maturity date.", "label": "Debt Instrument Amended Maturity Date", "terseLabel": "Debt instrument, amended maturity date" } } }, "localname": "DebtInstrumentAmendedMaturityDate", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "dateItemType" }, "wrk_DebtInstrumentMaturityYear": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Debt instrument maturity year.", "label": "Debt Instrument Maturity Year", "terseLabel": "Debt instrument, maturity year" } } }, "localname": "DebtInstrumentMaturityYear", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "gYearItemType" }, "wrk_DebtInstrumentMaximumBorrowingCapacityAmount": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Debt instrument maximum borrowing capacity amount.", "label": "Debt Instrument Maximum Borrowing Capacity Amount", "terseLabel": "Debt instrument, maximum borrowing capacity, amount" } } }, "localname": "DebtInstrumentMaximumBorrowingCapacityAmount", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_DebtInstrumentNoticePeriodForTermination": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Debt instrument notice period for termination.", "label": "Debt Instrument Notice Period For Termination", "terseLabel": "Debt Instrument, notice period for termination" } } }, "localname": "DebtInstrumentNoticePeriodForTermination", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "wrk_DecreaseFromDistributionsToNonredeemableNoncontrollingInterests": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Decrease in noncontrolling interest balance from payment of dividends or other distributions attributable to nonredeemable noncontrolling interest holders.", "label": "Decrease From Distributions To Nonredeemable Noncontrolling Interests", "negatedLabel": "Distributions and adjustments to noncontrolling interests" } } }, "localname": "DecreaseFromDistributionsToNonredeemableNoncontrollingInterests", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "wrk_DecreaseInAccountsReceivableFromTransfersNet": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Decrease in accounts receivable from transfers, net", "label": "Decrease In Accounts Receivable From Transfers Net", "terseLabel": "Cash paid to (proceeds from) financial institution" } } }, "localname": "DecreaseInAccountsReceivableFromTransfersNet", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueSummaryOfActivityUnderARSalesAgreementDetails" ], "xbrltype": "monetaryItemType" }, "wrk_DecreaseInNetCashProvidedByOperatingActivities": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Decrease in net cash provided by operating activities.", "label": "Decrease In Net Cash Provided By Operating Activities", "terseLabel": "Decrease in cash provided by operating activities" } } }, "localname": "DecreaseInNetCashProvidedByOperatingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_DeferredPurchasePriceOfTradeReceivablesSold": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Deferred purchase price of trade receivables sold where the receivables sold exceed collections.", "label": "Deferred Purchase Price Of Trade Receivables Sold", "terseLabel": "Deferred purchase price of trade receivables sold" } } }, "localname": "DeferredPurchasePriceOfTradeReceivablesSold", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" ], "xbrltype": "monetaryItemType" }, "wrk_DefinedBenefitPlanNetPeriodicBenefitCostCompany": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10010.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Defined benefit plan, net periodic benefit cost, company.", "label": "Defined Benefit Plan Net Periodic Benefit Cost Company", "totalLabel": "Company defined benefit plan income" } } }, "localname": "DefinedBenefitPlanNetPeriodicBenefitCostCompany", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "wrk_DelayedDrawTermLoanCreditAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Delayed draw term loan credit agreement.", "label": "Delayed Draw Term Loan Credit Agreement [Member]", "terseLabel": "DDTL Credit Agreement [Member]" } } }, "localname": "DelayedDrawTermLoanCreditAgreementMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Description of Business and Summary of Significant Accounting Policies [Abstract]", "label": "Description Of Business And Summary Of Significant Accounting Policies [Abstract]" } } }, "localname": "DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_DifferenceBetweenGuidanceInEffectBeforeAndAfterASU201707Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Difference between guidance in effect before and after ASU201707.", "label": "Difference Between Guidance In Effect Before And After A S U201707 [Member]", "terseLabel": "Difference Between Guidance In Effect Before And After ASU201707 [Member]" } } }, "localname": "DifferenceBetweenGuidanceInEffectBeforeAndAfterASU201707Member", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_DisclosureAcquisitionsAdditionalInformationDetailsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Disclosure Acquisitions Additional Information Details [Abstract]", "terseLabel": "Disclosure - Acquisitions - Additional Information (Details) [Abstract]" } } }, "localname": "DisclosureAcquisitionsAdditionalInformationDetailsAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_DivestitureRelatedCostsCredits": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails": { "order": 10020.0, "parentTag": "wrk_RestructuringAndOtherCostsOther", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10040.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Divestiture related costs credits.", "label": "Divestiture Related Costs Credits", "terseLabel": "Divestiture costs" } } }, "localname": "DivestitureRelatedCostsCredits", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_DocumentAndEntityInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Document and entity information.", "label": "Document And Entity Information [Abstract]" } } }, "localname": "DocumentAndEntityInformationAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_EffectiveTaxRateNetOfTaxComponentsOfOtherComprehensiveIncome": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Effective tax rate for tax components of other comprehensive income.", "label": "Effective Tax Rate Net Of Tax Components Of Other Comprehensive Income", "terseLabel": "Effective Tax Rate, Net of Tax Components of Other Comprehensive Income" } } }, "localname": "EffectiveTaxRateNetOfTaxComponentsOfOtherComprehensiveIncome", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_EquipmentAndInventoryRelocationCostsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equipment and inventory relocation costs.", "label": "Equipment And Inventory Relocation Costs [Member]", "terseLabel": "Equipment and Inventory Relocation Costs [Member]" } } }, "localname": "EquipmentAndInventoryRelocationCostsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "domainItemType" }, "wrk_EquityInIncomeOfConsolidatedEntities": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10080.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Equity in income of consolidated entities.", "label": "Equity In Income Of Consolidated Entities", "terseLabel": "Equity in income (loss) of consolidated entities" } } }, "localname": "EquityInIncomeOfConsolidatedEntities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails" ], "xbrltype": "monetaryItemType" }, "wrk_EstimatedEnterpriseValueOfAcquisition": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Estimated enterprise value of acquisition.", "label": "Estimated Enterprise Value Of Acquisition", "terseLabel": "Estimated Enterprise Value of Acquisition" } } }, "localname": "EstimatedEnterpriseValueOfAcquisition", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_EstimatedLossOnSaleOfAccountsReceivableByQuarter": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Estimated loss on sale of accounts receivable by quarter.", "label": "Estimated Loss On Sale Of Accounts Receivable By Quarter", "terseLabel": "Estimated loss on sale of accounts receivable by quarter" } } }, "localname": "EstimatedLossOnSaleOfAccountsReceivableByQuarter", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_FacilityCarryingCostsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Facility carrying costs.", "label": "Facility Carrying Costs [Member]", "terseLabel": "Facility Carrying Costs [Member]" } } }, "localname": "FacilityCarryingCostsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "domainItemType" }, "wrk_FairValueOfEquityAwardsIssued": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1": { "order": 10040.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value of equity awards issued.", "label": "Fair Value Of Equity Awards Issued", "negatedLabel": "Fair value of share-based awards issued in the purchase of a business" } } }, "localname": "FairValueOfEquityAwardsIssued", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical1" ], "xbrltype": "monetaryItemType" }, "wrk_FairValueOfEquityIssuedInAcquisition": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value of equity issued in acquisition.", "label": "Fair Value Of Equity Issued In Acquisition", "terseLabel": "Fair value of share-based awards issued in business combinations" } } }, "localname": "FairValueOfEquityIssuedInAcquisition", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "wrk_FairValueofDebtStepUpDeferredFinancingCostsandUnamortizedBondDiscounts": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails": { "order": 10070.0, "parentTag": "us-gaap_LongTermDebt", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value of debt step-up, deferred financing costs and unamortized bond discounts.", "label": "Fair Valueof Debt Step Up Deferred Financing Costsand Unamortized Bond Discounts", "terseLabel": "Fair value of debt step-up, deferred financing costs and unamortized bond discounts" } } }, "localname": "FairValueofDebtStepUpDeferredFinancingCostsandUnamortizedBondDiscounts", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "monetaryItemType" }, "wrk_FavorableContractsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Favorable contracts.", "label": "Favorable Contracts [Member]", "terseLabel": "Favorable Contracts [Member]" } } }, "localname": "FavorableContractsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails" ], "xbrltype": "domainItemType" }, "wrk_FiveYearTermLoanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Five year term loan.", "label": "Five Year Term Loan [Member]", "terseLabel": "Five Year Term Loan" } } }, "localname": "FiveYearTermLoanMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_ForestLandsAndMineralRightsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Forestlands and mineral rights.", "label": "Forest Lands And Mineral Rights [Member]", "terseLabel": "Forestlands and Mineral Rights [Member]" } } }, "localname": "ForestLandsAndMineralRightsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" ], "xbrltype": "domainItemType" }, "wrk_GoodwillTranslationAndOtherAdjustments": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Goodwill translation and other adjustments.", "label": "Goodwill Translation And Other Adjustments", "terseLabel": "Translation and other adjustments" } } }, "localname": "GoodwillTranslationAndOtherAdjustments", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationChangesInCarryingAmountOfGoodwillDetails" ], "xbrltype": "monetaryItemType" }, "wrk_GuarantorObligationsEstimatedExposureUndiscounted": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Guarantor obligations, estimated exposure, undiscounted.", "label": "Guarantor Obligations Estimated Exposure Undiscounted", "terseLabel": "Guarantor Obligations, Estimated Exposure, Undiscounted" } } }, "localname": "GuarantorObligationsEstimatedExposureUndiscounted", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IncomeLossExcludingPortionAttributableToRedeemableNoncontrollingInterest": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Income (loss), excluding portion attributable to redeemable noncontrolling interest.", "label": "Income Loss Excluding Portion Attributable To Redeemable Noncontrolling Interest", "terseLabel": "Net income attributable to common stockholders" } } }, "localname": "IncomeLossExcludingPortionAttributableToRedeemableNoncontrollingInterest", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "wrk_IncomeTaxesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Income Taxes [Abstract]", "label": "Income Taxes [Abstract]" } } }, "localname": "IncomeTaxesAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_IncreaseFromContributionsToNonredeemableNoncontrollingInterests": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Increase from contributions to nonredeemable noncontrolling interests.", "label": "Increase From Contributions To Nonredeemable Noncontrolling Interests", "terseLabel": "Contributions" } } }, "localname": "IncreaseFromContributionsToNonredeemableNoncontrollingInterests", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "wrk_IncreaseInCashProvidedByInvestingActivities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Increase in cash provided by investing activities.", "label": "Increase In Cash Provided By Investing Activities", "terseLabel": "Increase in cash provided by investing activities" } } }, "localname": "IncreaseInCashProvidedByInvestingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IncreaseInDiscountRateToEstimateFairValueOfReportingUnit": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Increase in discount rate to estimate fair value of reporting unit.", "label": "Increase In Discount Rate To Estimate Fair Value Of Reporting Unit", "terseLabel": "Increase in discount rate to estimate fair value of reporting unit" } } }, "localname": "IncreaseInDiscountRateToEstimateFairValueOfReportingUnit", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_IncrementalAmountOfLineOfCredit": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Incremental amount of line of credit.", "label": "Incremental Amount Of Line Of Credit", "terseLabel": "Incremental line of credit" } } }, "localname": "IncrementalAmountOfLineOfCredit", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyCapitalDistribution": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10190.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany capital distribution.", "label": "Intercompany Capital Distribution", "negatedLabel": "Intercompany capital distribution" } } }, "localname": "IntercompanyCapitalDistribution", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyCapitalDistributionNonCashFinancingActivities": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany capital distribution non cash financing activities.", "label": "Intercompany Capital Distribution Non Cash Financing Activities", "negatedLabel": "Intercompany capital distribution" } } }, "localname": "IntercompanyCapitalDistributionNonCashFinancingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyCapitalInvestment": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10300.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany capital investment.", "label": "Intercompany Capital Investment", "negatedLabel": "Intercompany capital investment" } } }, "localname": "IntercompanyCapitalInvestment", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyCapitalInvestmentNonCashInvestingActivities": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany capital investment non cash investing activities.", "label": "Intercompany Capital Investment Non Cash Investing Activities", "negatedLabel": "Intercompany capital investment" } } }, "localname": "IntercompanyCapitalInvestmentNonCashInvestingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyCapitalReceipt": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10180.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany capital receipt.", "label": "Intercompany Capital Receipt", "terseLabel": "Intercompany capital receipt" } } }, "localname": "IntercompanyCapitalReceipt", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyCapitalReceiptNonCashFinancingActivities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany capital receipt non cash financing activities.", "label": "Intercompany Capital Receipt Non Cash Financing Activities", "terseLabel": "Intercompany capital receipt" } } }, "localname": "IntercompanyCapitalReceiptNonCashFinancingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyDividends": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10200.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany dividends.", "label": "Intercompany Dividends", "negatedLabel": "Intercompany dividends" } } }, "localname": "IntercompanyDividends", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyDividendsPaidNonCashFinancingActivities": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany dividends paid non cash financing activities.", "label": "Intercompany Dividends Paid Non Cash Financing Activities", "negatedLabel": "Intercompany dividends paid" } } }, "localname": "IntercompanyDividendsPaidNonCashFinancingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyInterestIncomeExpenseNet": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails": { "order": 10030.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany interest income (expense) net.", "label": "Intercompany Interest Income Expense Net", "terseLabel": "Intercompany interest income (expense), net" } } }, "localname": "IntercompanyInterestIncomeExpenseNet", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesBorrowing": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10160.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes borrowing.", "label": "Intercompany Notes Borrowing", "negatedLabel": "Intercompany notes borrowing" } } }, "localname": "IntercompanyNotesBorrowing", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesBorrowingNonCashFinancingActivities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes borrowing non cash financing activities.", "label": "Intercompany Notes Borrowing Non Cash Financing Activities", "terseLabel": "Intercompany notes borrowing" } } }, "localname": "IntercompanyNotesBorrowingNonCashFinancingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesIssued": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10280.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes issued.", "label": "Intercompany Notes Issued", "negatedLabel": "Intercompany notes issued" } } }, "localname": "IntercompanyNotesIssued", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesIssuedNonCashInvestingActivities": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes issued non cash investing activities.", "label": "Intercompany Notes Issued Non Cash Investing Activities", "negatedLabel": "Intercompany notes issued" } } }, "localname": "IntercompanyNotesIssuedNonCashInvestingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesPayable": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10030.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes payable.", "label": "Intercompany Notes Payable", "terseLabel": "Intercompany notes payable" } } }, "localname": "IntercompanyNotesPayable", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesPayments": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10170.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes payments.", "label": "Intercompany Notes Payments", "negatedLabel": "Intercompany notes payments" } } }, "localname": "IntercompanyNotesPayments", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesPaymentsNonCashFinancingActivities": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes payments non cash financing activities.", "label": "Intercompany Notes Payments Non Cash Financing Activities", "negatedLabel": "Intercompany notes payments" } } }, "localname": "IntercompanyNotesPaymentsNonCashFinancingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesProceeds": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10290.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes proceeds", "label": "Intercompany Notes Proceeds", "terseLabel": "Intercompany notes proceeds" } } }, "localname": "IntercompanyNotesProceeds", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesProceedsNonCashInvestingActivities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes proceeds non cash investing activities.", "label": "Intercompany Notes Proceeds Non Cash Investing Activities", "terseLabel": "Intercompany notes proceeds" } } }, "localname": "IntercompanyNotesProceedsNonCashInvestingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyNotesReceivable": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10300.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany notes receivable.", "label": "Intercompany Notes Receivable", "terseLabel": "Intercompany notes receivable" } } }, "localname": "IntercompanyNotesReceivable", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyPayables": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10220.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany payables.", "label": "Intercompany Payables", "terseLabel": "Intercompany payables" } } }, "localname": "IntercompanyPayables", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyPayablesNoncashOperatingActivities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany payables noncash operating activities.", "label": "Intercompany Payables Noncash Operating Activities", "terseLabel": "Intercompany payables" } } }, "localname": "IntercompanyPayablesNoncashOperatingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyReceivables": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10370.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany receivables.", "label": "Intercompany Receivables", "terseLabel": "Intercompany receivables" } } }, "localname": "IntercompanyReceivables", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyReceivablesNoncashOperatingActivities": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Intercompany receivables noncash operating activities.", "label": "Intercompany Receivables Noncash Operating Activities", "negatedLabel": "Intercompany receivables" } } }, "localname": "IntercompanyReceivablesNoncashOperatingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyReturnOfCapital": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10310.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany return of capital.", "label": "Intercompany Return Of Capital", "terseLabel": "Intercompany return of capital" } } }, "localname": "IntercompanyReturnOfCapital", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IntercompanyReturnOfCapitalNonCashInvestingActivities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany return of capital non cash investing activities.", "label": "Intercompany Return Of Capital Non Cash Investing Activities", "terseLabel": "Intercompany return of capital" } } }, "localname": "IntercompanyReturnOfCapitalNonCashInvestingActivities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_InternationalAndOtherDebtMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "International and other debt.", "label": "International And Other Debt [Member]", "terseLabel": "International and Other Debt [Member]" } } }, "localname": "InternationalAndOtherDebtMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_InventoriesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Inventories.", "label": "Inventories [Abstract]" } } }, "localname": "InventoriesAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_InventoriesSuppliesAndSpareParts": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails": { "order": 10050.0, "parentTag": "us-gaap_FIFOInventoryAmount", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Inventories supplies and spare parts.", "label": "Inventories Supplies And Spare Parts", "terseLabel": "Spare parts and supplies" } } }, "localname": "InventoriesSuppliesAndSpareParts", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureInventoriesScheduleOfInventoriesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_InvestmentsInConsolidatedSubsidiaries": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10310.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Investments in consolidated subsidiaries.", "label": "Investments In Consolidated Subsidiaries", "terseLabel": "Investments in consolidated subsidiaries" } } }, "localname": "InvestmentsInConsolidatedSubsidiaries", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_IssuanceOfClassCommonStockNetOfStockReceivedForMinimumTaxWithholdings": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Issuance of Class A common stock net of stock received for minimum tax withholdings.", "label": "Issuance Of Class Common Stock Net Of Stock Received For Minimum Tax Withholdings", "terseLabel": "Issuance of common stock, net of stock received for minimum tax withholdings" } } }, "localname": "IssuanceOfClassCommonStockNetOfStockReceivedForMinimumTaxWithholdings", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "monetaryItemType" }, "wrk_IssuancesOfCommonStockNetOfRelatedMinimumTaxWithholdings": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10110.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Issuances of common stock, net of related minimum tax withholdings.", "label": "Issuances Of Common Stock Net Of Related Minimum Tax Withholdings", "terseLabel": "Issuances of common stock, net of related minimum tax withholdings" } } }, "localname": "IssuancesOfCommonStockNetOfRelatedMinimumTaxWithholdings", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfCashFlowsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "wrk_KapStoneAcquisitionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "KapStone acquisition.", "label": "Kap Stone Acquisition [Member]", "terseLabel": "KapStone Acquisition [Member]" } } }, "localname": "KapStoneAcquisitionMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfWeightedAverageLifeAndFairValueOfIntangibleAssetRecognizedInKapstoneAcquisitionExcludingGoodwillDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsTables", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionSummaryOfOpeningAndClosingBalancesOfContractAssetsAndContractLiabilitiesDetails" ], "xbrltype": "domainItemType" }, "wrk_KapStoneMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "KapStone.", "label": "Kap Stone [Member]", "terseLabel": "KapStone [Member]" } } }, "localname": "KapStoneMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITYParenthetical" ], "xbrltype": "domainItemType" }, "wrk_LandAndDevelopmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Land and development.", "label": "Land And Development [Member]", "terseLabel": "Land and Development [Member]" } } }, "localname": "LandAndDevelopmentMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRevenueRecognitionScheduleOfDisaggregateRevenueByGeographicalMarketAndProductTypeSegmentDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "wrk_LandAndDevelopmentPortfolioAssetsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Land and Development Portfolio Assets [Member]", "label": "Land And Development Portfolio Assets [Member]", "terseLabel": "Land and Development Portfolio Assets [Member]" } } }, "localname": "LandAndDevelopmentPortfolioAssetsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAssetsHeldForSaleAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_LineOfCreditFacilityInitialDrawdownPeriod": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line of credit facility initial drawdown period.", "label": "Line Of Credit Facility Initial Drawdown Period", "terseLabel": "Credit facility initial drowdowns period" } } }, "localname": "LineOfCreditFacilityInitialDrawdownPeriod", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "wrk_LineOfCreditFacilityMaximumEuroDenominatedBorrowingCapacity": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Line of credit facility maximum euro denominated borrowing capacity.", "label": "Line Of Credit Facility Maximum Euro Denominated Borrowing Capacity", "terseLabel": "Line of credit facility, maximum Euro denominated borrowing capacity" } } }, "localname": "LineOfCreditFacilityMaximumEuroDenominatedBorrowingCapacity", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_LineOfCreditFacilityNumberOfDrawdowns": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Line of credit facility number of drawdowns.", "label": "Line Of Credit Facility Number Of Drawdowns", "terseLabel": "Number of drawdowns under credit facility" } } }, "localname": "LineOfCreditFacilityNumberOfDrawdowns", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "wrk_LitigationCostReimbursement": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Litigation cost reimbursement.", "label": "Litigation Cost Reimbursement", "terseLabel": "Litigation cost reimbursement" } } }, "localname": "LitigationCostReimbursement", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_LongtermDebtExcludingCapitalLeaseObligationsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Long-term Debt, Excluding Capital Lease Obligations [Member]", "label": "Longterm Debt Excluding Capital Lease Obligations [Member]", "terseLabel": "Long-term Debt, Excluding Capital Lease Obligations [Member]" } } }, "localname": "LongtermDebtExcludingCapitalLeaseObligationsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfAggregateMaturitiesOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_MaximumEligibleReceivablesThatMayBeSold": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Maximum eligible receivables that may be sold.", "label": "Maximum Eligible Receivables That May Be Sold", "terseLabel": "Maximum eligible receivables that may be sold" } } }, "localname": "MaximumEligibleReceivablesThatMayBeSold", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_MaximumPercentageOfIssuedAndOutstandingKapStoneSharesToElectWestRockStockConsideration": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Maximum percentage of issued and outstanding KapStone Shares to elect WestRock stock consideration.", "label": "Maximum Percentage Of Issued And Outstanding Kap Stone Shares To Elect West Rock Stock Consideration", "terseLabel": "Maximum percentage of issued and outstanding KapStone Shares to elect WestRock stock consideration" } } }, "localname": "MaximumPercentageOfIssuedAndOutstandingKapStoneSharesToElectWestRockStockConsideration", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_MeasurementPeriodAdjustmentsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement period adjustments.", "label": "Measurement Period Adjustments [Member]", "terseLabel": "Measurement Period Adjustments [Member]" } } }, "localname": "MeasurementPeriodAdjustmentsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsSummaryOfFairValuesOfAssetsAcquiredAndLiabilitiesAssumedByMajorOfAssetsAndLiabilitiesAndMeasurementPeriodAdjustmentsDetails" ], "xbrltype": "domainItemType" }, "wrk_MultiEmployerPensionWithdrawal": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10020.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10030.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10380.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10160.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Multiemployer pension withdrawal.", "label": "Multi Employer Pension Withdrawal", "negatedLabel": "Multiemployer pension withdrawals", "terseLabel": "Multiemployer pension withdrawals" } } }, "localname": "MultiEmployerPensionWithdrawal", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "wrk_MultiemployerAndOtherPlansPeriodCost": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails": { "order": 10030.0, "parentTag": "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Multiemployer and other plans, period cost.", "label": "Multiemployer And Other Plans Period Cost", "terseLabel": "Multiemployer and other plans" } } }, "localname": "MultiemployerAndOtherPlansPeriodCost", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansSummaryOfComponentsOfNetPensionIncomeCostAndSummaryOfComponentsOfPostretirementBenefitCostDetails" ], "xbrltype": "monetaryItemType" }, "wrk_MultiemployerPlansReductionToPreviouslyRecordedWithdrawalLiability": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Multiemployer plans, reduction to previously recorded withdrawal liability.", "label": "Multiemployer Plans Reduction To Previously Recorded Withdrawal Liability", "terseLabel": "Amount of reduction to previously recorded MEPP withdrawal liability" } } }, "localname": "MultiemployerPlansReductionToPreviouslyRecordedWithdrawalLiability", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_NetPropertyPlantAndEquipmentMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Net property, plant and equipment.", "label": "Net Property Plant And Equipment [Member]", "terseLabel": "Net Property, Plant and Equipment [Member]" } } }, "localname": "NetPropertyPlantAndEquipmentMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "domainItemType" }, "wrk_NewAccountingPronouncementsRecentlyIssuedPolicyPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "New accounting pronouncements recently issued policy.", "label": "New Accounting Pronouncements Recently Issued Policy Policy [Text Block]", "terseLabel": "New Accounting Standards - Recently Issued" } } }, "localname": "NewAccountingPronouncementsRecentlyIssuedPolicyPolicyTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "wrk_NonAllocatedExpenses": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10060.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Non-allocated expenses.", "label": "Non Allocated Expenses", "negatedLabel": "Non-allocated expenses" } } }, "localname": "NonAllocatedExpenses", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_NonRecourseLiabilitiesHeldBySpecialPurposeEntities": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails": { "order": 10060.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10050.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Non-recourse liabilities held by special purpose entities.", "label": "Non Recourse Liabilities Held By Special Purpose Entities", "terseLabel": "Non-recourse liabilities held by special purpose entities" } } }, "localname": "NonRecourseLiabilitiesHeldBySpecialPurposeEntities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "wrk_NoncashFinancingItemsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Noncash financing items.", "label": "Noncash Financing Items [Abstract]", "terseLabel": "Financing activities:" } } }, "localname": "NoncashFinancingItemsAbstract", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "stringItemType" }, "wrk_NoncashInvestingItemsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Noncash investing items.", "label": "Noncash Investing Items [Abstract]", "terseLabel": "Investing activities:" } } }, "localname": "NoncashInvestingItemsAbstract", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "stringItemType" }, "wrk_NoncashOperatingItemsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Noncash operating items.", "label": "Noncash Operating Items [Abstract]", "terseLabel": "Operating activities:" } } }, "localname": "NoncashOperatingItemsAbstract", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsNoncashOperatingInvestingAndFinancingActivitiesDetails" ], "xbrltype": "stringItemType" }, "wrk_NotesDueFiscal2019To2022Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Notes due fiscal 2019 to 2022.", "label": "Notes Due Fiscal2019 To2022 [Member]", "terseLabel": "Notes Due Fiscal 2019 to 2022 [Member]" } } }, "localname": "NotesDueFiscal2019To2022Member", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_NotesDueFiscal2023To2028Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Notes due fiscal 2023 to 2028.", "label": "Notes Due Fiscal2023 To2028 [Member]", "terseLabel": "Notes Due Fiscal 2023 to 2028 [Member]" } } }, "localname": "NotesDueFiscal2023To2028Member", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_NotesDueFiscal2029To2033Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Notes due fiscal 2029 to 2033.", "label": "Notes Due Fiscal2029 To2033 [Member]", "terseLabel": "Notes Due Fiscal 2029 to 2033 [Member]" } } }, "localname": "NotesDueFiscal2029To2033Member", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_NotesDueFiscal2037To2047Member": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Notes due fiscal 2037 to 2047.", "label": "Notes Due Fiscal2037 To2047 [Member]", "terseLabel": "Notes Due Fiscal 2037 to 2047 [Member]" } } }, "localname": "NotesDueFiscal2037To2047Member", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_NumberOfLawsuitsTheCompanyHasBeenNamedADefendantInAsbestosRelatedPersonalInjuryLitigation": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of lawsuits the company has been named a defendant in asbestos-related personal injury litigation.", "label": "Number Of Lawsuits The Company Has Been Named A Defendant In Asbestos Related Personal Injury Litigation", "terseLabel": "Number of Lawsuits the Company Has Been Named a Defendant in Asbestos-related Personal Injury Litigation" } } }, "localname": "NumberOfLawsuitsTheCompanyHasBeenNamedADefendantInAsbestosRelatedPersonalInjuryLitigation", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" ], "xbrltype": "integerItemType" }, "wrk_OtherCostsRelatedToRestructuringAndOtherCostsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Other costs related to restructuring and other costs.", "label": "Other Costs Related To Restructuring And Other Costs [Member]", "terseLabel": "Other Costs Related to Restructuring and Other Costs [Member]" } } }, "localname": "OtherCostsRelatedToRestructuringAndOtherCostsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringChargesRelatedToActiveRestructuringInitiativesDetails" ], "xbrltype": "domainItemType" }, "wrk_PaceIndustryUnionManagementPensionFundMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Pace Industry Union-Management Pension Fund (PIUMPF).", "label": "Pace Industry Union Management Pension Fund [Member]", "terseLabel": "Pace Industry Union Management Pension Fund [Member]" } } }, "localname": "PaceIndustryUnionManagementPensionFundMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_PensionFundingMoreLessThanExpense": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS": { "order": 10370.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The amount of pension benefit costs and postretirement benefit costs recognized during the period for defined benefit and defined contribution plans, less the amount of cash or cash equivalents contributed by the entity to fund its pension plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain or loss on plan assets, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.", "label": "Pension Funding More Less Than Expense", "negatedLabel": "Pension and other postretirement funding (more) than expense (income)" } } }, "localname": "PensionFundingMoreLessThanExpense", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" ], "xbrltype": "monetaryItemType" }, "wrk_PeriodsOfPaymentsUsedToCalculateWithdrawalLiabilityInConnectionWithPIUMPFWithdrawal": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Periods of payments used to calculate withdrawal liability in connection with PIUMPF withdrawal.", "label": "Periods Of Payments Used To Calculate Withdrawal Liability In Connection With P I U M P F Withdrawal", "terseLabel": "Periods of Payments Used to Calculate Withdrawal Liability in Connection with PIUMPF Withdrawal" } } }, "localname": "PeriodsOfPaymentsUsedToCalculateWithdrawalLiabilityInConnectionWithPIUMPFWithdrawal", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "durationItemType" }, "wrk_PrepaymentOfOutstandingPrincipalAmount": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Prepayment of outstanding principal amount.", "label": "Prepayment Of Outstanding Principal Amount", "terseLabel": "Prepayment of outstanding principal amount" } } }, "localname": "PrepaymentOfOutstandingPrincipalAmount", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_ReceivableFromFinancialInstitutionCurrent": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Receivable from financial institution, current.", "label": "Receivable From Financial Institution Current", "periodEndLabel": "Receivable from financial institution at June 30", "periodStartLabel": "Receivable from financial institution at beginning of fiscal year" } } }, "localname": "ReceivableFromFinancialInstitutionCurrent", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureFairValueSummaryOfActivityUnderARSalesAgreementDetails" ], "xbrltype": "monetaryItemType" }, "wrk_ReceivablesBackedFinancingMaximumBorrowingAmount": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Receivables backed financing maximum borrowing amount.", "label": "Receivables Backed Financing Maximum Borrowing Amount", "terseLabel": "Receivables backed financing, maximum borrowing amount" } } }, "localname": "ReceivablesBackedFinancingMaximumBorrowingAmount", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_ReceivablesFacilityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Receivables facility.", "label": "Receivables Facility [Member]", "terseLabel": "Receivables Facility [Member]" } } }, "localname": "ReceivablesFacilityMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_ReclassificationsFromOtherComprehensiveIncomeBeforeTax": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10010.0, "parentTag": "wrk_ReclassificationsFromOtherComprehensiveIncomeNetOfTax", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Reclassifications from other comprehensive income before tax.", "label": "Reclassifications From Other Comprehensive Income Before Tax", "negatedLabel": "Total Reclassifications From Other Comprehensive Income Before Tax" } } }, "localname": "ReclassificationsFromOtherComprehensiveIncomeBeforeTax", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "wrk_ReclassificationsFromOtherComprehensiveIncomeNetOfTax": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Reclassifications from other comprehensive income net of tax.", "label": "Reclassifications From Other Comprehensive Income Net Of Tax", "totalLabel": "Total Reclassifications From Other Comprehensive Income Net Of Tax" } } }, "localname": "ReclassificationsFromOtherComprehensiveIncomeNetOfTax", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "wrk_ReclassificationsFromOtherComprehensiveIncomeTaxPortion": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails": { "order": 10020.0, "parentTag": "wrk_ReclassificationsFromOtherComprehensiveIncomeNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Reclassifications from other comprehensive income tax portion.", "label": "Reclassifications From Other Comprehensive Income Tax Portion", "terseLabel": "Total Reclassifications From Other Comprehensive Income Tax Portion" } } }, "localname": "ReclassificationsFromOtherComprehensiveIncomeTaxPortion", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureEquityAndOtherComprehensiveIncomeLossSummaryOfReclassificationOutOfAccumulatedOtherComprehensiveLossDetails" ], "xbrltype": "monetaryItemType" }, "wrk_ReportingUnitDiscountRate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Reporting unit, discount rate.", "label": "Reporting Unit Discount Rate", "terseLabel": "Reporting unit, discount rate" } } }, "localname": "ReportingUnitDiscountRate", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_ReportingUnitGrowthRate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Reporting unit, growth rate.", "label": "Reporting Unit Growth Rate", "terseLabel": "Reporting unit, growth rate" } } }, "localname": "ReportingUnitGrowthRate", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByLessThanTenPercent": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Reporting \u200bunit\u200b percentage \u200bof fair\u200b value \u200bin excess \u200bof carrying \u200bamount by less than ten percent.", "label": "Reporting Unit Percentage Of Fair Value In Excess Of Carrying Amount By Less Than Ten Percent", "terseLabel": "Reporting unit, percentage of fair value in excess of carrying value" } } }, "localname": "ReportingUnitPercentageOfFairValueInExcessOfCarryingAmountByLessThanTenPercent", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_RestrictedAssetsHeldBySpecialPurposeEntities": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS": { "order": 10270.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Restricted assets held by special purpose entities.", "label": "Restricted Assets Held By Special Purpose Entities", "terseLabel": "Restricted assets held by special purpose entities" } } }, "localname": "RestrictedAssetsHeldBySpecialPurposeEntities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingBalanceSheetsDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETS" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCosts": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted and other costs including but not limited to asset impairments, acquisition and integration costs.", "label": "Restructuring And Other Costs", "terseLabel": "Restructuring and other costs" } } }, "localname": "RestructuringAndOtherCosts", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs.", "label": "Restructuring And Other Costs [Abstract]" } } }, "localname": "RestructuringAndOtherCostsAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_RestructuringAndOtherCostsNet": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringAndOtherCostsDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10050.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": -1.0 }, "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10180.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount charged against earnings in the period for incurred and estimated costs, excluding asset retirement obligations, associated with exit from or disposal of business activities or restructurings pursuant to a program that is planned and controlled by management, and materially changes either the scope of a business undertaken by an entity, or the manner in which that business is conducted and other costs including but not limited to asset impairments, acquisition and integration costs.", "label": "Restructuring And Other Costs Net", "negatedLabel": "Restructuring and other costs", "terseLabel": "Restructuring and other costs", "totalLabel": "Restructuring and other costs" } } }, "localname": "RestructuringAndOtherCostsNet", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringAndOtherCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsNetEquipmentAndInventoryRelocationCosts": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10070.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs, net, equipment and inventory relocation costs.", "label": "Restructuring And Other Costs Net Equipment And Inventory Relocation Costs", "terseLabel": "Equipment and inventory relocation costs" } } }, "localname": "RestructuringAndOtherCostsNetEquipmentAndInventoryRelocationCosts", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsNetFacilityCarryingCosts": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10080.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Facility carrying costs.", "label": "Restructuring And Other Costs Net Facility Carrying Costs", "terseLabel": "Facility carrying costs" } } }, "localname": "RestructuringAndOtherCostsNetFacilityCarryingCosts", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsNetPropertyPlantAndEquipment": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10050.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs, net, property, plant and equipment.", "label": "Restructuring And Other Costs Net Property Plant And Equipment", "terseLabel": "Net property, plant and equipment" } } }, "localname": "RestructuringAndOtherCostsNetPropertyPlantAndEquipment", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsNetSeveranceAndOtherEmployeeCosts": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails": { "order": 10060.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Severance and Other Employee Costs", "label": "Restructuring And Other Costs Net Severance And Other Employee Costs", "terseLabel": "Severance and other employee costs" } } }, "localname": "RestructuringAndOtherCostsNetSeveranceAndOtherEmployeeCosts", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfReconciliationOfAccrualsAndChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsOther": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringAndOtherCostsDetails": { "order": 10020.0, "parentTag": "wrk_RestructuringAndOtherCostsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs, other.", "label": "Restructuring And Other Costs Other", "terseLabel": "Other", "totalLabel": "Other total" } } }, "localname": "RestructuringAndOtherCostsOther", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfAcquisitionDivestitureAndIntegrationCostsDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfRestructuringAndOtherCostsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsReserve": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs reserve.", "label": "Restructuring And Other Costs Reserve", "periodEndLabel": "Accrual at June 30", "periodStartLabel": "Accrual at beginning of fiscal year" } } }, "localname": "RestructuringAndOtherCostsReserve", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfChangesInRestructuringAccrualChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsReserveAccrualAdjustment": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs reserve, accrual adjustment.", "label": "Restructuring And Other Costs Reserve Accrual Adjustment", "terseLabel": "Adjustment to accruals" } } }, "localname": "RestructuringAndOtherCostsReserveAccrualAdjustment", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfChangesInRestructuringAccrualChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsReserveForeignCurrencyRateChanges": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs reserve foreign currency rate changes.", "label": "Restructuring And Other Costs Reserve Foreign Currency Rate Changes", "terseLabel": "Foreign currency rate changes" } } }, "localname": "RestructuringAndOtherCostsReserveForeignCurrencyRateChanges", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfChangesInRestructuringAccrualChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsReservePeriodExpense": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs reserve, period expense.", "label": "Restructuring And Other Costs Reserve Period Expense", "terseLabel": "Additional accruals" } } }, "localname": "RestructuringAndOtherCostsReservePeriodExpense", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfChangesInRestructuringAccrualChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndOtherCostsReserveSettledWithCash": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Restructuring and other costs reserve settled with cash.", "label": "Restructuring And Other Costs Reserve Settled With Cash", "negatedLabel": "Payments" } } }, "localname": "RestructuringAndOtherCostsReserveSettledWithCash", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsScheduleOfChangesInRestructuringAccrualChargesDetails" ], "xbrltype": "monetaryItemType" }, "wrk_RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Restructuring and related activities and other costs disclosure.", "label": "Restructuring And Related Activities And Other Costs Disclosure Text Block [Text Block]", "terseLabel": "Restructuring and Other Costs" } } }, "localname": "RestructuringAndRelatedActivitiesAndOtherCostsDisclosureTextBlockTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCosts" ], "xbrltype": "textBlockItemType" }, "wrk_RetirementPlansAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Retirement Plans [Abstract]", "label": "Retirement Plans [Abstract]" } } }, "localname": "RetirementPlansAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_RevolvingCreditAndSwingFacilitiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Revolving credit and swing facilities.", "label": "Revolving Credit And Swing Facilities [Member]", "terseLabel": "Revolving Credit and Swing Facilities [Member]" } } }, "localname": "RevolvingCreditAndSwingFacilitiesMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_ScheduleOfRestructuringAndOtherCostsReserveByTypeOfCostTextBlockTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule of restructuring and other costs reserve by type of cost.", "label": "Schedule Of Restructuring And Other Costs Reserve By Type Of Cost Text Block Table [Text Block]", "terseLabel": "Schedule of Changes in Restructuring Accrual and Reconciliation of Accrual Charges" } } }, "localname": "ScheduleOfRestructuringAndOtherCostsReserveByTypeOfCostTextBlockTableTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsTables" ], "xbrltype": "textBlockItemType" }, "wrk_ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule of restructuring and related costs and other costs.", "label": "Schedule Of Restructuring And Related Costs And Other Costs Text Block Table [Text Block]", "terseLabel": "Schedule of Restructuring and Other Costs" } } }, "localname": "ScheduleOfRestructuringAndRelatedCostsAndOtherCostsTextBlockTableTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsTables" ], "xbrltype": "textBlockItemType" }, "wrk_ScheduleOfRestructuringCostsIncludedInOtherExpensesTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule of restructuring costs included in other expenses.", "label": "Schedule Of Restructuring Costs Included In Other Expenses Table [Text Block]", "terseLabel": "Schedule of Acquisition, Divestiture and Integration Costs" } } }, "localname": "ScheduleOfRestructuringCostsIncludedInOtherExpensesTableTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRestructuringAndOtherCostsTables" ], "xbrltype": "textBlockItemType" }, "wrk_SegmentInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Segment Information [Abstract]", "label": "Segment Information [Abstract]" } } }, "localname": "SegmentInformationAbstract", "nsuri": "http://www.westrock.com/20190630", "xbrltype": "stringItemType" }, "wrk_SegmentReportingInformationSegmentIncome": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails": { "order": 10010.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Segment reporting information, segment income.", "label": "Segment Reporting Information Segment Income", "terseLabel": "Segment income" } } }, "localname": "SegmentReportingInformationSegmentIncome", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "monetaryItemType" }, "wrk_SellingGeneralAndAdministrativeExpenseExcludingIntangibleAmortization": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10130.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc excluding amortization expense.", "label": "Selling General And Administrative Expense Excluding Intangible Amortization", "terseLabel": "Selling, general and administrative, excluding intangible amortization" } } }, "localname": "SellingGeneralAndAdministrativeExpenseExcludingIntangibleAmortization", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesAdditionalInformationDetails", "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "wrk_SellingGeneralAndAdministrativeIntangibleAmortization": { "auth_ref": [], "calculation": { "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME": { "order": 10140.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Selling, general and administrative intangible amortization.", "label": "Selling General And Administrative Intangible Amortization", "terseLabel": "Selling, general and administrative intangible amortization" } } }, "localname": "SellingGeneralAndAdministrativeIntangibleAmortization", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSelectedCondensedConsolidatingFinancialStatementsOfParentIssuerGuarantorsAndNonGuarantorsCondensedConsolidatingStatementsOfIncomeDetails", "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFINCOME" ], "xbrltype": "monetaryItemType" }, "wrk_SeniorNotesDueJuneTwoThousandAndTwentyEightMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior Notes due June 2028.", "label": "Senior Notes Due June Two Thousand And Twenty Eight [Member]", "terseLabel": "Senior Notes due June 2028 [Member]" } } }, "localname": "SeniorNotesDueJuneTwoThousandAndTwentyEightMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SeniorNotesDueTwoThousandAndThirtyTwoMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due two thousand and thirty two.", "label": "Senior Notes Due Two Thousand And Thirty Two [Member]", "terseLabel": "Senior Notes due 2032 [Member]" } } }, "localname": "SeniorNotesDueTwoThousandAndThirtyTwoMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SeniorNotesDueTwoThousandAndTwentyEightMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due two thousand and twenty eight.", "label": "Senior Notes Due Two Thousand And Twenty Eight [Member]", "terseLabel": "Senior Notes due 2028 [Member]" } } }, "localname": "SeniorNotesDueTwoThousandAndTwentyEightMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SeniorNotesDueTwoThousandAndTwentyFiveMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due two thousand and twenty five.", "label": "Senior Notes Due Two Thousand And Twenty Five [Member]", "terseLabel": "Senior Notes due 2025 [Member]" } } }, "localname": "SeniorNotesDueTwoThousandAndTwentyFiveMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SeniorNotesDueTwoThousandAndTwentyFourMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due two thousand and twenty four.", "label": "Senior Notes Due Two Thousand And Twenty Four [Member]", "terseLabel": "Senior Notes due 2024 [Member]" } } }, "localname": "SeniorNotesDueTwoThousandAndTwentyFourMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SeniorNotesDueTwoThousandAndTwentyNineMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due two thousand and twenty nine.", "label": "Senior Notes Due Two Thousand And Twenty Nine [Member]", "terseLabel": "Senior Notes due 2029 [Member]" } } }, "localname": "SeniorNotesDueTwoThousandAndTwentyNineMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SeniorNotesDueTwoThousandAndTwentySevenMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due two thousand and twenty seven.", "label": "Senior Notes Due Two Thousand And Twenty Seven [Member]", "terseLabel": "Senior Notes due 2027 [Member]" } } }, "localname": "SeniorNotesDueTwoThousandAndTwentySevenMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SeniorNotesDueTwoThousandAndTwentySixMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due two thousand and twenty six.", "label": "Senior Notes Due Two Thousand And Twenty Six [Member]", "terseLabel": "Senior Notes due 2026 [Member]" } } }, "localname": "SeniorNotesDueTwoThousandAndTwentySixMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_SharesOfAcquirerRatioOfCommonStock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Shares of acquirer ratio of common stock.", "label": "Shares Of Acquirer Ratio Of Common Stock", "terseLabel": "Ratio of KapStone Shares to WestRock Shares" } } }, "localname": "SharesOfAcquirerRatioOfCommonStock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "percentItemType" }, "wrk_SharesOfWRKCoRatioOfCommonStock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Shares of WRKCo ratio of common stock.", "label": "Shares Of W R K Co Ratio Of Common Stock", "terseLabel": "Number of WRKCo Shares to WestRock Shares" } } }, "localname": "SharesOfWRKCoRatioOfCommonStock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "sharesItemType" }, "wrk_SignificantAccountingPoliciesPolicyTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Significant accounting policies policy.", "label": "Significant Accounting Policies Policy [Text Block]", "terseLabel": "Significant Accounting Policies" } } }, "localname": "SignificantAccountingPoliciesPolicyTextBlock", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureBasisOfPresentationAndSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "wrk_SouthwestAreasPensionFundMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Southwest areas pension fund.", "label": "Southwest Areas Pension Fund [Member]", "terseLabel": "Central States, Southeast and Southwest Areas Pension Fund [Member]" } } }, "localname": "SouthwestAreasPensionFundMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureRetirementPlansAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_StockIssuedDuringPeriodIssuanceOfClassCommonStockNetOfStockReceivedForMinimumTaxWithholdings": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Stock issued during period, Issuance of class a common stock net of stock received for min tax withholdings.", "label": "Stock Issued During Period Issuance Of Class Common Stock Net Of Stock Received For Minimum Tax Withholdings", "terseLabel": "Issuance of common stock, net of stock received for minimum tax withholdings" } } }, "localname": "StockIssuedDuringPeriodIssuanceOfClassCommonStockNetOfStockReceivedForMinimumTaxWithholdings", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" ], "xbrltype": "sharesItemType" }, "wrk_SupplierFinancingAndCommercialCardProgramsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Supplier financing and commercial card programs.", "label": "Supplier Financing And Commercial Card Programs [Member]", "terseLabel": "Supplier Financing and Commercial Card Programs [Member]" } } }, "localname": "SupplierFinancingAndCommercialCardProgramsMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_TaxCutsAndJobActOf2017AdditionalIncomeTaxExpenseFromTransitionTaxProvisionalLiability": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of additional income tax expense from transition tax provisional liability pursuant to Tax Cuts and Jobs Act.", "label": "Tax Cuts And Job Act Of2017 Additional Income Tax Expense From Transition Tax Provisional Liability", "terseLabel": "Additional income tax expense from transition tax provisional liability" } } }, "localname": "TaxCutsAndJobActOf2017AdditionalIncomeTaxExpenseFromTransitionTaxProvisionalLiability", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_TaxCutsAndJobsActOf2017AccountingComplete": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Indicates (true false) whether accounting for income tax effect of Tax Cuts and Jobs Act is complete.", "label": "Tax Cuts And Jobs Act Of2017 Accounting Complete", "terseLabel": "Tax cuts and jobs act, accounting complete" } } }, "localname": "TaxCutsAndJobsActOf2017AccountingComplete", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "booleanItemType" }, "wrk_TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefitFromRevaluationOfDeferredTaxAssetsAndLiabilities": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of income tax expense (benefit) revaluation of deferred tax assets and liabilities from effect of Tax Cuts and Jobs Act.", "label": "Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit From Revaluation Of Deferred Tax Assets And Liabilities", "terseLabel": "Income tax expense from revaluation of deferred tax assets and liabilities" } } }, "localname": "TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefitFromRevaluationOfDeferredTaxAssetsAndLiabilities", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxBenefitExpense": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Tax cuts and jobs act of 2017 incomplete accounting change in tax rate deferred tax liability provisional income tax benefit (expense).", "label": "Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Benefit Expense", "terseLabel": "Provisional Estimate of Benefit (Expense) Impact on Remeasurement of Deferred Tax Balances" } } }, "localname": "TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxBenefitExpense", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails" ], "xbrltype": "monetaryItemType" }, "wrk_TenderedAndExchangedNotesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tendered and exchanged notes.", "label": "Tendered And Exchanged Notes [Member]", "terseLabel": "Tendered and Exchanged Notes [Member]" } } }, "localname": "TenderedAndExchangedNotesMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_TermLoanFacilitiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Term loan facilities.", "label": "Term Loan Facilities [Member]", "terseLabel": "Term Loan Facilities [Member]" } } }, "localname": "TermLoanFacilitiesMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtScheduleOfCarryingValueOfIndividualComponentsOfDebtDetails" ], "xbrltype": "domainItemType" }, "wrk_ThreeSixtyFourDaysTermLoanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Three sixty four days term loan.", "label": "Three Sixty Four Days Term Loan [Member]", "terseLabel": "364-Day Term Loan [Member]" } } }, "localname": "ThreeSixtyFourDaysTermLoanMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_ThreeYearTermLoanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Three year term loan.", "label": "Three Year Term Loan [Member]", "terseLabel": "Three Year Term Loan [Member]" } } }, "localname": "ThreeYearTermLoanMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureDebtAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_UnaffiliatedCustomersMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Unaffiliated customers.", "label": "Unaffiliated Customers [Member]", "terseLabel": "Unaffiliated Customers [Member]" } } }, "localname": "UnaffiliatedCustomersMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationCertainOperatingDataForSegmentsDetails" ], "xbrltype": "domainItemType" }, "wrk_VictoryPackagingMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Victory packaging unit.", "label": "Victory Packaging [Member]", "terseLabel": "Victory Packaging [Member]" } } }, "localname": "VictoryPackagingMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureSegmentInformationAdditionalInformationDetails" ], "xbrltype": "domainItemType" }, "wrk_WRKCoIncorporationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "WRKCo Incorporation.", "label": "W R K Co Incorporation [Member]", "terseLabel": "WRKCo Inc. [Member]" } } }, "localname": "WRKCoIncorporationMember", "nsuri": "http://www.westrock.com/20190630", "presentation": [ "http://www.westrock.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetails" ], "xbrltype": "domainItemType" } }, "unitCount": 9 } }, "std_ref": { "r0": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=d3e1107-107759" }, "r1": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721533-107759" }, "r10": { "Name": "Accounting Standards Codification", "Paragraph": "5B", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(e)", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760" }, "r100": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585" }, "r101": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585" }, "r102": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585" }, "r103": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585" }, "r104": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585" }, "r105": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585" }, "r106": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3000-108585" }, "r107": { "Name": "Accounting Standards Codification", "Paragraph": "21B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=SL94080549-108585" }, "r108": { "Name": "Accounting Standards Codification", "Paragraph": "24", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585" }, "r109": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585" }, "r11": { "Name": "Accounting Standards Codification", "Paragraph": "5B", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760" }, "r110": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585" }, "r111": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585" }, "r112": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585" }, "r113": { "Name": "Accounting Standards Codification", "Paragraph": "28", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585" }, "r114": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585" }, "r115": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3098-108585" }, "r116": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586" }, "r117": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586" }, "r118": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(h))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r119": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(e),(f))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r12": { "Name": "Accounting Standards Codification", "Paragraph": "5C", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(2)", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760" }, "r120": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(h)(2))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r121": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.12-04(a))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690" }, "r122": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.12-04.(a))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690" }, "r123": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "235", "URI": "http://asc.fasb.org/topic&trid=2122369" }, "r124": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794" }, "r125": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794" }, "r126": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22580-107794" }, "r127": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "250", "URI": "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794" }, "r128": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256" }, "r129": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=d3e1377-109256" }, "r13": { "Name": "Accounting Standards Codification", "Paragraph": "5C", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760" }, "r130": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=d3e1505-109256" }, "r131": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=d3e1252-109256" }, "r132": { "Name": "Accounting Standards Codification", "Paragraph": "60B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256" }, "r133": { "Name": "Accounting Standards Codification", "Paragraph": "60B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256" }, "r134": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256" }, "r135": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r136": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r137": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257" }, "r138": { "Name": "Accounting Standards Codification", "Paragraph": "52", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109256448&loc=d3e4984-109258" }, "r139": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "260", "URI": "http://asc.fasb.org/topic&trid=2144383" }, "r14": { "Name": "Accounting Standards Codification", "Paragraph": "5D", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721677-107760" }, "r140": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "270", "URI": "http://asc.fasb.org/extlink&oid=109236672&loc=d3e725-108305" }, "r141": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "270", "URI": "http://asc.fasb.org/extlink&oid=109236672&loc=d3e765-108305" }, "r142": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.10-01.(b)(6))", "Topic": "270", "URI": "http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699" }, "r143": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8615-108599" }, "r144": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8654-108599" }, "r145": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8657-108599" }, "r146": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8660-108599" }, "r147": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8663-108599" }, "r148": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8672-108599" }, "r149": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599" }, "r15": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760" }, "r150": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r151": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r152": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(g)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r153": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r154": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r155": { "Name": "Accounting Standards Codification", "Paragraph": "25", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599" }, "r156": { "Name": "Accounting Standards Codification", "Paragraph": "30", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599" }, "r157": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599" }, "r158": { "Name": "Accounting Standards Codification", "Paragraph": "32", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599" }, "r159": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8475-108599" }, "r16": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765" }, "r160": { "Name": "Accounting Standards Codification", "Paragraph": "41", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599" }, "r161": { "Name": "Accounting Standards Codification", "Paragraph": "42", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9054-108599" }, "r162": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "280", "URI": "http://asc.fasb.org/topic&trid=2134510" }, "r163": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524" }, "r164": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524" }, "r165": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 4.E)", "Topic": "310", "URI": "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707" }, "r166": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "320", "URI": "http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563" }, "r167": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "323", "URI": "http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570" }, "r168": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "35", "SubTopic": "10", "Topic": "330", "URI": "http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312" }, "r169": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "330", "URI": "http://asc.fasb.org/topic&trid=2126998" }, "r17": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765" }, "r170": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Subparagraph": "(b)", "Topic": "340", "URI": "http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054" }, "r171": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266" }, "r172": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975" }, "r173": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267" }, "r174": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267" }, "r175": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(g)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267" }, "r176": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267" }, "r177": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267" }, "r178": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=SL108378252-109267" }, "r179": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267" }, "r18": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765" }, "r180": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267" }, "r181": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274" }, "r182": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r183": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(1)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r184": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(3)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r185": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r186": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "((a)(1),(b))", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r187": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r188": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(1)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r189": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r19": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6801-107765" }, "r190": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275" }, "r191": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2599-110228" }, "r192": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2473-110228" }, "r193": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r194": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r195": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r196": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230" }, "r197": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230" }, "r198": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230" }, "r199": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230" }, "r2": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760" }, "r20": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6904-107765" }, "r200": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230" }, "r201": { "Name": "Accounting Standards Codification", "Paragraph": "3A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=109226691&loc=SL51724579-110230" }, "r202": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "360", "URI": "http://asc.fasb.org/topic&trid=2155823" }, "r203": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "410", "URI": "http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859" }, "r204": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r205": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)(1)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r206": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r207": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869" }, "r208": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 5.P.3)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747" }, "r209": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.3)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747" }, "r21": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765" }, "r210": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 5.P.4)", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r211": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(b)(1))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r212": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(b))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r213": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 5.P.4(d))", "Topic": "420", "URI": "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747" }, "r214": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "440", "URI": "http://asc.fasb.org/topic&trid=2144648" }, "r215": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "25", "SubTopic": "20", "Topic": "450", "URI": "http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346" }, "r216": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "450", "URI": "http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349" }, "r217": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "450", "URI": "http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349" }, "r218": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "450", "URI": "http://asc.fasb.org/topic&trid=2127136" }, "r219": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "460", "URI": "http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248" }, "r22": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766" }, "r220": { "Name": "Accounting Standards Codification", "Paragraph": "12A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=99376301&loc=SL5988623-112600" }, "r221": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601" }, "r222": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=6802200&loc=SL6230698-112601" }, "r223": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.3-10(d)(4)(iii))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=115932134&loc=d3e168853-122756" }, "r224": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.3-10(d)(4)(iv))", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=115932134&loc=d3e168853-122756" }, "r225": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(3)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870" }, "r226": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870" }, "r227": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "40", "SubTopic": "50", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=114001942&loc=d3e12317-112629" }, "r228": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "40", "SubTopic": "50", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=114001942&loc=d3e12355-112629" }, "r229": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "470", "URI": "http://asc.fasb.org/topic&trid=2208564" }, "r23": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(13))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r230": { "Name": "Accounting Standards Codification", "Paragraph": "3A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(12)(c)", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764" }, "r231": { "Name": "Accounting Standards Codification", "Paragraph": "3A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(16)(c)", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764" }, "r232": { "Name": "Accounting Standards Codification", "Paragraph": "3A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "14", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764" }, "r233": { "Name": "Accounting Standards Codification", "Paragraph": "3A", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "15", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764" }, "r234": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644" }, "r235": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644" }, "r236": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644" }, "r237": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644" }, "r238": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644" }, "r239": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.3-04)", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770" }, "r24": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(14))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r240": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655" }, "r241": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "505", "URI": "http://asc.fasb.org/topic&trid=2208762" }, "r242": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044" }, "r243": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044" }, "r244": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044" }, "r245": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045" }, "r246": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045" }, "r247": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=109196051&loc=SL49130558-203045" }, "r248": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=109196051&loc=SL49130564-203045" }, "r249": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045" }, "r25": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(17))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r250": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045" }, "r251": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045" }, "r252": { "Name": "Accounting Standards Codification", "Paragraph": "91", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=108792157&loc=SL49130690-203046-203046" }, "r253": { "Name": "Accounting Standards Codification", "Paragraph": "91", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=108792157&loc=SL49130690-203046-203046" }, "r254": { "Name": "Accounting Standards Codification", "Paragraph": "91", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=108792157&loc=SL49130690-203046-203046" }, "r255": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Subparagraph": "(i)(1)", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048" }, "r256": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "65", "SubTopic": "10", "Topic": "606", "URI": "http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048" }, "r257": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "606", "URI": "http://asc.fasb.org/topic&trid=49130388" }, "r258": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "712", "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664" }, "r259": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "15", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "712", "URI": "http://asc.fasb.org/extlink&oid=6410066&loc=d3e79218-111664" }, "r26": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(19))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r260": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919" }, "r261": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=d3e1731-114919" }, "r262": { "Name": "Accounting Standards Codification", "Paragraph": "3A", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919" }, "r263": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r264": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(10)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r265": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r266": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r267": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r268": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(ii)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r269": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(iv)(01)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r27": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(20))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r270": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r271": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r272": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r273": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r274": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(4)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r275": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(h)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r276": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(i)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r277": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(j)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r278": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920" }, "r279": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920" }, "r28": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(22))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r280": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920" }, "r281": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920" }, "r282": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920" }, "r283": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(1)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920" }, "r284": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(2)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920" }, "r285": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(3)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920" }, "r286": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(4)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920" }, "r287": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)(5)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920" }, "r288": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920" }, "r289": { "Name": "Accounting Standards Codification", "Paragraph": "17", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921" }, "r29": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(24))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r290": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "65", "SubTopic": "20", "Subparagraph": "(e)", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=108412710&loc=SL108413206-114923" }, "r291": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "70", "Topic": "715", "URI": "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942" }, "r292": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "715", "URI": "http://asc.fasb.org/topic&trid=2235017" }, "r293": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "35", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899" }, "r294": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901" }, "r295": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109196918&loc=d3e11149-113907" }, "r296": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109196918&loc=d3e11178-113907" }, "r297": { "Name": "Accounting Standards Codification", "Paragraph": "10B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318" }, "r298": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84176650&loc=d3e31917-109318" }, "r299": { "Name": "Accounting Standards Codification", "Paragraph": "6", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84176650&loc=d3e31931-109318" }, "r3": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760" }, "r30": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(28))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r300": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84176650&loc=d3e31958-109318" }, "r301": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319" }, "r302": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319" }, "r303": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319" }, "r304": { "Name": "Accounting Standards Codification", "Paragraph": "15A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319" }, "r305": { "Name": "Accounting Standards Codification", "Paragraph": "15A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319" }, "r306": { "Name": "Accounting Standards Codification", "Paragraph": "15A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319" }, "r307": { "Name": "Accounting Standards Codification", "Paragraph": "15A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(4)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319" }, "r308": { "Name": "Accounting Standards Codification", "Paragraph": "15A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319" }, "r309": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319" }, "r31": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(29))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r310": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319" }, "r311": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB TOPIC 6.I)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817" }, "r312": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 6.I.7)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817" }, "r313": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324" }, "r314": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "740", "URI": "http://asc.fasb.org/topic&trid=2144680" }, "r315": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "25", "SubTopic": "10", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460" }, "r316": { "Name": "Accounting Standards Codification", "Paragraph": "23", "Publisher": "FASB", "Section": "25", "SubTopic": "10", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460" }, "r317": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463" }, "r318": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463" }, "r319": { "Name": "Accounting Standards Codification", "Paragraph": "37", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=108330185&loc=d3e2207-128464" }, "r32": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(3))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r320": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472" }, "r321": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5263-128473" }, "r322": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5333-128473" }, "r323": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "30", "SubTopic": "30", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477" }, "r324": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "30", "SubTopic": "30", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477" }, "r325": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)(1)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479" }, "r326": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)(4)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479" }, "r327": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "805", "URI": "http://asc.fasb.org/topic&trid=2303972" }, "r328": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=d3e5283-111683" }, "r329": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683" }, "r33": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r330": { "Name": "Accounting Standards Codification", "Paragraph": "16", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683" }, "r331": { "Name": "Accounting Standards Codification", "Paragraph": "19", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683" }, "r332": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683" }, "r333": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=108774443&loc=SL4613674-111683" }, "r334": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r335": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r336": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r337": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(3)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r338": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c),(3)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684" }, "r339": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684" }, "r34": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30)(a)(3))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r340": { "Name": "Accounting Standards Codification", "Paragraph": "4I", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=84234705&loc=SL4590271-111686" }, "r341": { "Name": "Accounting Standards Codification", "Paragraph": "4J", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686" }, "r342": { "Name": "Accounting Standards Codification", "Paragraph": "4K", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "810", "URI": "http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686" }, "r343": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "c", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959" }, "r344": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959" }, "r345": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959" }, "r346": { "Name": "Accounting Standards Codification", "Paragraph": "4B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959" }, "r347": { "Name": "Accounting Standards Codification", "Paragraph": "4B", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959" }, "r348": { "Name": "Accounting Standards Codification", "Paragraph": "4C", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959" }, "r349": { "Name": "Accounting Standards Codification", "Paragraph": "4C", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959" }, "r35": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(30))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r350": { "Name": "Accounting Standards Codification", "Paragraph": "4D", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959" }, "r351": { "Name": "Accounting Standards Codification", "Paragraph": "4D", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "815", "URI": "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959" }, "r352": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r353": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bbb)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r354": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(bbb)(2)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r355": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "820", "URI": "http://asc.fasb.org/topic&trid=2155941" }, "r356": { "Name": "Accounting Standards Codification", "Paragraph": "10", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611" }, "r357": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611" }, "r358": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13476-108611" }, "r359": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "45", "SubTopic": "230", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906" }, "r36": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(31))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r360": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=109240241&loc=d3e32022-110900" }, "r361": { "Name": "Accounting Standards Codification", "Paragraph": "18", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=109240241&loc=d3e32157-110900" }, "r362": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900" }, "r363": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Topic": "830", "URI": "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901" }, "r364": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399" }, "r365": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399" }, "r366": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399" }, "r367": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "55", "SubTopic": "30", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400" }, "r368": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737" }, "r369": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(2)(i)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r37": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(32))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r370": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(d)(2)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r371": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729" }, "r372": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "340", "Topic": "928", "URI": "http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004" }, "r373": { "Name": "Accounting Standards Codification", "Paragraph": "7", "Publisher": "FASB", "Section": "25", "SubTopic": "360", "Topic": "932", "URI": "http://asc.fasb.org/extlink&oid=96866604&loc=d3e64895-109465" }, "r374": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "25", "SubTopic": "20", "Topic": "940", "URI": "http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953" }, "r375": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(10))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r376": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(11))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r377": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(13))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r378": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(16))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r379": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(22))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r38": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(6)(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r380": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03(23))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r381": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.9-03.17)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878" }, "r382": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(13)(f))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260" }, "r383": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(15))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260" }, "r384": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(22))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260" }, "r385": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04(23))", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260" }, "r386": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823" }, "r387": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(16))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r388": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(10))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r389": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(12))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r39": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(6)(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r390": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(16))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r391": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(23)(a)(4))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r392": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(24))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r393": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(25))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r394": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03(a)(8))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r395": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03.(a),19)", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r396": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(10))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263" }, "r397": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(18))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263" }, "r398": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(19))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263" }, "r399": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.7-04(8))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263" }, "r4": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760" }, "r40": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(6)(c))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r400": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437" }, "r401": { "Name": "Accounting Standards Codification", "Paragraph": "4H", "Publisher": "FASB", "Section": "50", "SubTopic": "40", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=99384497&loc=SL65671331-158438" }, "r402": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "310", "Subparagraph": "(SX 210.12-29(Footnote 4))", "Topic": "948", "URI": "http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014" }, "r403": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Footnote 2))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024" }, "r404": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "360", "Subparagraph": "(SX 210.12-28(Footnote 4))", "Topic": "970", "URI": "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024" }, "r405": { "Name": "Regulation 12B", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-2" }, "r406": { "Article": "12", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "13", "Sentence": "Column B" }, "r407": { "Footnote": "2", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "28" }, "r408": { "Footnote": "4", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "28" }, "r409": { "Footnote": "4", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "29" }, "r41": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.1)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r410": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "(a)", "Publisher": "SEC", "Section": "12", "Subsection": "04" }, "r411": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "a", "Publisher": "SEC", "Section": "12", "Subsection": "04" }, "r412": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "c", "Publisher": "SEC", "Section": "3", "Subparagraph": "4", "Subsection": "10" }, "r413": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "d", "Publisher": "SEC", "Section": "3", "Subparagraph": "(4)(iii)", "Subsection": "10" }, "r414": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "d", "Publisher": "SEC", "Section": "3", "Subparagraph": "(4)(iv)", "Subsection": "10" }, "r415": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "d", "Publisher": "SEC", "Section": "3", "Subparagraph": "4", "Subsection": "10" }, "r416": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "e", "Publisher": "SEC", "Section": "3", "Subparagraph": "4", "Subsection": "10" }, "r417": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "f", "Publisher": "SEC", "Section": "3", "Subparagraph": "4", "Subsection": "10" }, "r418": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "i", "Publisher": "SEC", "Section": "3", "Subsection": "10" }, "r42": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.13)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r43": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.14)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r44": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.17)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r45": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r46": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19(b),22(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r47": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r48": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19,20)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r49": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.20)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r5": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1474-107760" }, "r50": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.21)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r51": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22(a)(1))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r52": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22(a)(2))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r53": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.22)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r54": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.24)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r55": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.25)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r56": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.29-31)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r57": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.31)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r58": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.4)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r59": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.6(a)(1),(3))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r6": { "Name": "Accounting Standards Codification", "Paragraph": "3A", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721659-107760" }, "r60": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.6(a)(4))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r61": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.6(a))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r62": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.6(c))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r63": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.8)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r64": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.9)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r65": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a),(b),(c)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r66": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a-c)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r67": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r68": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r69": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(f)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r7": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721663-107760" }, "r70": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(h)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r71": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(i),(j),(k)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r72": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(j)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r73": { "Name": "Accounting Standards Codification", "Paragraph": "10A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580" }, "r74": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580" }, "r75": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580" }, "r76": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580" }, "r77": { "Name": "Accounting Standards Codification", "Paragraph": "14A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580" }, "r78": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580" }, "r79": { "Name": "Accounting Standards Codification", "Paragraph": "17A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL34724391-108580" }, "r8": { "Name": "Accounting Standards Codification", "Paragraph": "4B", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721665-107760" }, "r80": { "Name": "Accounting Standards Codification", "Paragraph": "17B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL34724394-108580" }, "r81": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580" }, "r82": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580" }, "r83": { "Name": "Accounting Standards Codification", "Paragraph": "1A", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580" }, "r84": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580" }, "r85": { "Name": "Accounting Standards Codification", "Paragraph": "1B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580" }, "r86": { "Name": "Accounting Standards Codification", "Paragraph": "5", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114867106&loc=d3e557-108580" }, "r87": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581" }, "r88": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(10))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r89": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(12))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r9": { "Name": "Accounting Standards Codification", "Paragraph": "5A", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "205", "URI": "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721671-107760" }, "r90": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(20))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r91": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03(21))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r92": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.2(a),(d))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r93": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.9)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r94": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233" }, "r95": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585" }, "r96": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585" }, "r97": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585" }, "r98": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585" }, "r99": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585" } }, "version": "2.1" }