{ "instance": { "becn-10q_20190630.htm": { "axisCustom": 0, "axisStandard": 19, "contextCount": 281, "dts": { "calculationLink": { "local": [ "becn-20190630_cal.xml" ] }, "definitionLink": { "local": [ "becn-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": [ "becn-10q_20190630.htm" ] }, "labelLink": { "local": [ "becn-20190630_lab.xml" ], "remote": [ "http://xbrl.fasb.org/srt/2018/elts/srt-doc-2018-01-31.xml", "https://xbrl.sec.gov/dei/2018/dei-doc-2018-01-31.xml", "http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-doc-2018-01-31.xml" ] }, "presentationLink": { "local": [ "becn-20190630_pre.xml" ] }, "referenceLink": { "remote": [ "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", "http://xbrl.fasb.org/srt/2018/elts/srt-ref-2018-01-31.xml" ] }, "schema": { "local": [ "becn-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/deprecated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd", "http://xbrl.fasb.org/us-gaap/2018/elts/us-parts-codification-2018-01-31.xsd" ] } }, "elementCount": 483, "entityCount": 1, "hidden": { "http://fasb.org/us-gaap/2018-01-31": 39, "http://xbrl.sec.gov/dei/2018-01-31": 10, "total": 49 }, "keyCustom": 49, "keyStandard": 333, "memberCustom": 23, "memberStandard": 29, "nsprefix": "becn", "nsuri": "http://www.beaconroofingsupply.com/20190630", "report": { "R1": { "firstAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation", "shortName": "Document And Entity Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "dei:DocumentType", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R10": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100090 - Disclosure - Summary of Significant Accounting Policies", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies", "shortName": "Summary of Significant Accounting Policies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SignificantAccountingPoliciesTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R11": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100100 - Disclosure - Acquisitions", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitions", "shortName": "Acquisitions", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BusinessCombinationDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R12": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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 - Net Sales", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSales", "shortName": "Net Sales", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100120 - Disclosure - Net Income (Loss) Per Share", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShare", "shortName": "Net Income (Loss) Per Share", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:EarningsPerShareTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R14": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100130 - Disclosure - Stock-based Compensation", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensation", "shortName": "Stock-based Compensation", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R15": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100140 - Disclosure - Goodwill and Intangible Assets", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssets", "shortName": "Goodwill and Intangible Assets", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R16": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100150 - Disclosure - Financing Arrangements", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements", "shortName": "Financing Arrangements", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DebtDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R17": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100160 - Disclosure - Commitments and Contingencies", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingencies", "shortName": "Commitments and Contingencies", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R18": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100170 - Disclosure - Geographic Data", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicData", "shortName": "Geographic Data", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:SegmentReportingDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R19": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ComprehensiveIncomeNoteTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100180 - Disclosure - Accumulated Other Comprehensive Income (Loss)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLoss", "shortName": "Accumulated Other Comprehensive Income (Loss)", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ComprehensiveIncomeNoteTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R2": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100010 - Statement - Consolidated Balance Sheets", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets", "shortName": "Consolidated Balance Sheets", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:CommonStockValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R20": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100190 - Disclosure - Fair Value Measurement", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurement", "shortName": "Fair Value Measurement", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:FairValueDisclosuresTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R21": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "becn:SubsidiaryGuaranteesObligationsOfDebtDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100200 - Disclosure - Supplemental Guarantor Information", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformation", "shortName": "Supplemental Guarantor Information", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "becn:SubsidiaryGuaranteesObligationsOfDebtDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R22": { "firstAnchor": { "ancestors": [ "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100210 - Disclosure - Summary of Significant Accounting Policies (Policies)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies", "shortName": "Summary of Significant Accounting Policies (Policies)", "subGroupType": "policies", "uniqueAnchor": { "ancestors": [ "us-gaap:SignificantAccountingPoliciesTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:BasisOfAccountingPolicyPolicyTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R23": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100220 - Disclosure - Acquisitions (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsTables", "shortName": "Acquisitions (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R24": { "firstAnchor": { "ancestors": [ "us-gaap:RevenueFromContractWithCustomerTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100230 - Disclosure - Net Sales (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesTables", "shortName": "Net Sales (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:RevenueFromContractWithCustomerTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:DisaggregationOfRevenueTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R25": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100240 - Disclosure - Net Income (Loss) Per Share (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareTables", "shortName": "Net Income (Loss) Per Share (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R26": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100250 - Disclosure - Stock-based Compensation (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationTables", "shortName": "Stock-based Compensation (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R27": { "firstAnchor": { "ancestors": [ "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfGoodwillTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100260 - Disclosure - Goodwill and Intangible Assets (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsTables", "shortName": "Goodwill and Intangible Assets (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfGoodwillTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R28": { "firstAnchor": { "ancestors": [ "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100270 - Disclosure - Financing Arrangements (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsTables", "shortName": "Financing Arrangements (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R29": { "firstAnchor": { "ancestors": [ "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100280 - Disclosure - Commitments and Contingencies (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesTables", "shortName": "Commitments and Contingencies (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R3": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100020 - Statement - Consolidated Balance Sheets (Parenthetical)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical", "shortName": "Consolidated Balance Sheets (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R30": { "firstAnchor": { "ancestors": [ "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_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": "100290 - Disclosure - Geographic Data (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataTables", "shortName": "Geographic Data (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R31": { "firstAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "srt:ScheduleOfCondensedBalanceSheetTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100300 - Disclosure - Supplemental Guarantor Information (Tables)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationTables", "shortName": "Supplemental Guarantor Information (Tables)", "subGroupType": "tables", "uniqueAnchor": { "ancestors": [ "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "srt:ScheduleOfCondensedBalanceSheetTableTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R32": { "firstAnchor": { "ancestors": [ "p", "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "dei:EntityIncorporationDateOfIncorporation", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100310 - Disclosure - Company Overview - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail", "shortName": "Company Overview - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "dei:EntityIncorporationDateOfIncorporation", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R33": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:PreferredStockSharesIssued", "reportCount": 1, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100320 - Disclosure - Acquisitions - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "shortName": "Acquisitions - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180930", "decimals": "INF", "lang": null, "name": "becn:NumberOfBusinessLocationsAcquired", "reportCount": 1, "unique": true, "unitRef": "U_becnBranch", "xsiNil": "false" } }, "R34": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:Goodwill", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100330 - Disclosure - Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail", "shortName": "Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapBusinessAcquisitionAxis_becnAlliedBuildingProductsCorporationAndAffiliatedEntityMember_20190331", "decimals": "-3", "lang": null, "name": "us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R35": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100340 - Disclosure - Net Sales - Summary of Net Sales by Product Line and Geography (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail", "shortName": "Net Sales - Summary of Net Sales by Product Line and Geography (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:DisaggregationOfRevenueTableTextBlock", "us-gaap:RevenueFromContractWithCustomerTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_srtStatementGeographicalAxis_countryUS_20190401_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R36": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100350 - Disclosure - Net Income (Loss) Per Share - Components and Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "shortName": "Net Income (Loss) Per Share - Components and Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R37": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapStatementEquityComponentsAxis_us-gaapPreferredStockMember_20190401_20190630", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100360 - Disclosure - Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail", "shortName": "Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapStatementEquityComponentsAxis_us-gaapPreferredStockMember_20190401_20190630", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R38": { "firstAnchor": { "ancestors": [ "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20160209", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100370 - Disclosure - Stock-based Compensation - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail", "shortName": "Stock-based Compensation - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20160209", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R39": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "4", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100380 - Disclosure - Stock-based Compensation - Fair Value of Stock Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationFairValueOfStockOptionsBlackScholesOptionPricingModelWeightedAverageAssumptionsDetail", "shortName": "Stock-based Compensation - Fair Value of Stock Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "4", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R4": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100030 - Statement - Consolidated Statements of Operations", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations", "shortName": "Consolidated Statements of Operations", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:InterestExpense", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R40": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180930", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "reportCount": 1, "unitRef": "U_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100390 - Disclosure - Stock-based compensation - Stock Options Outstanding and Activity During the Period (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail", "shortName": "Stock-based compensation - Stock Options Outstanding and Activity During the Period (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "INF", "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R41": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "becn:ScheduleOfShareBasedCompensationAdditionalInformationTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "2", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100400 - Disclosure - Stock-based compensation - Stock Option Grants, Vesting, and Exercises (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionGrantsVestingAndExercisesDetail", "shortName": "Stock-based compensation - Stock Option Grants, Vesting, and Exercises (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "becn:ScheduleOfShareBasedCompensationAdditionalInformationTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "2", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" } }, "R42": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "becn:ScheduleOfRestrictedStockUnitsAdditionalInformationTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "2", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "reportCount": 1, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100410 - Disclosure - Stock-based Compensation - Restricted Shares and Units Outstanding and Activity During the Period (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail", "shortName": "Stock-based Compensation - Restricted Shares and Units Outstanding and Activity During the Period (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapAwardTypeAxis_us-gaapRestrictedStockUnitsRSUMember_20180930", "decimals": "INF", "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber", "reportCount": 1, "unique": true, "unitRef": "U_xbrlishares", "xsiNil": "false" } }, "R43": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "becn:ScheduleOfRestrictedStockUnitsAdditionalInformationTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "2", "first": true, "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "reportCount": 1, "unitRef": "U_iso4217USD_xbrlishares", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100420 - Disclosure - Stock-based Compensation - Schedule Of Restricted Stock Units Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationScheduleOfRestrictedStockUnitsAdditionalInformationDetail", "shortName": "Stock-based Compensation - Schedule Of Restricted Stock Units Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "becn:ScheduleOfRestrictedStockUnitsAdditionalInformationTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R44": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:Goodwill", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100430 - Disclosure - Goodwill and Intangible Assets - Summary of Changes in goodwill (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfChangesInGoodwillDetail", "shortName": "Goodwill and Intangible Assets - Summary of Changes in goodwill (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfGoodwillTextBlock", "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:GoodwillForeignCurrencyTranslationGainLoss", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R45": { "firstAnchor": { "ancestors": [ "p", "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20171001_20180930", "decimals": "-7", "first": true, "lang": null, "name": "us-gaap:FinitelivedIntangibleAssetsAcquired1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100440 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "shortName": "Goodwill and Intangible Assets - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20171001_20180930", "decimals": "-7", "first": true, "lang": null, "name": "us-gaap:FinitelivedIntangibleAssetsAcquired1", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R46": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100450 - Disclosure - Goodwill and Intangible Assets - Summary of Intangible Assets (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail", "shortName": "Goodwill and Intangible Assets - Summary of Intangible Assets (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsGross", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R47": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100460 - Disclosure - Goodwill and Intangible Assets - Summary of Estimated Future Amortization (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail", "shortName": "Goodwill and Intangible Assets - Summary of Estimated Future Amortization (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R48": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:LongTermLineOfCredit", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100470 - Disclosure - Financing Arrangements - Long-term Debt Instruments (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "shortName": "Financing Arrangements - Long-term Debt Instruments (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:SeniorNotesCurrent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R49": { "firstAnchor": { "ancestors": [ "becn:PercentageOfFixedInterestRateOfEquipmentFinancingFacilities", "link:footnote", "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_srtRangeAxis_srtMinimumMember_us-gaapLongtermDebtTypeAxis_becnEquipmentFinancialFacilitiesAndOtherMember_20181001_20190630", "decimals": "INF", "first": true, "lang": "en-US", "name": "becn:PercentageOfFixedInterestRateOfEquipmentFinancingFacilities", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100480 - Disclosure - Financing Arrangements - Long-term Debt Instruments (Parenthetical) (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "shortName": "Financing Arrangements - Long-term Debt Instruments (Parenthetical) (Detail)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "becn:PercentageOfFixedInterestRateOfEquipmentFinancingFacilities", "link:footnote", "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_srtRangeAxis_srtMinimumMember_us-gaapLongtermDebtTypeAxis_becnEquipmentFinancialFacilitiesAndOtherMember_20181001_20190630", "decimals": "INF", "first": true, "lang": "en-US", "name": "becn:PercentageOfFixedInterestRateOfEquipmentFinancingFacilities", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R5": { "firstAnchor": { "ancestors": [ "link:footnote", "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180401_20180630", "decimals": "-5", "first": true, "lang": "en-US", "name": "becn:TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100040 - Statement - Consolidated Statements of Operations (Parenthetical)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperationsParenthetical", "shortName": "Consolidated Statements of Operations (Parenthetical)", "subGroupType": "parenthetical", "uniqueAnchor": { "ancestors": [ "link:footnote", "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180401_20180630", "decimals": "-5", "first": true, "lang": "en-US", "name": "becn:TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R50": { "firstAnchor": { "ancestors": [ "p", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180102", "decimals": "-7", "first": true, "lang": null, "name": "us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100490 - Disclosure - Financing Arrangements - Financing - Allied Acquisition - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "shortName": "Financing Arrangements - Financing - Allied Acquisition - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapTypeOfArrangementAxis_becnAlliedFinancingArrangementsMember_20180102_20180102", "decimals": "-5", "lang": null, "name": "us-gaap:PaymentsOfDebtIssuanceCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R51": { "firstAnchor": { "ancestors": [ "p", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180102", "decimals": "-7", "first": true, "lang": null, "name": "us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100500 - Disclosure - Financing Arrangements - 2023 ABL - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "shortName": "Financing Arrangements - 2023 ABL - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapCreditFacilityAxis_us-gaapRevolvingCreditFacilityMember_us-gaapDebtInstrumentAxis_becnTwoThousandAndTwentyThreeAssetBasedRevolvingLineOfCreditMember_20181001_20190630", "decimals": "4", "lang": null, "name": "us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R52": { "firstAnchor": { "ancestors": [ "p", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapCreditFacilityAxis_becnTermLoanMember_us-gaapDebtInstrumentAxis_becnTermLoanDueInJanuaryTwoTwoThousandAndTwentyFiveMember_20180102", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:LineOfCredit", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100510 - Disclosure - Financing Arrangements - 2025 Term Loan - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "shortName": "Financing Arrangements - 2025 Term Loan - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapCreditFacilityAxis_becnTermLoanMember_us-gaapDebtInstrumentAxis_becnTermLoanDueInJanuaryTwoTwoThousandAndTwentyFiveMember_20181001_20190630", "decimals": null, "lang": "en-US", "name": "us-gaap:DebtInstrumentFrequencyOfPeriodicPayment", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R53": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapDebtInstrumentAxis_becnSeniorNotesDueInNovemberTwoThousandTwentyFiveMember_20171025", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:DebtInstrumentFaceAmount", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100520 - Disclosure - Financing Arrangements - 2025 Senior Notes - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "shortName": "Financing Arrangements - 2025 Senior Notes - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapDebtInstrumentAxis_becnSeniorNotesDueInNovemberTwoThousandTwentyFiveMember_20171025", "decimals": "INF", "lang": null, "name": "becn:DebtInstrumentIssuePricePercentage", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R54": { "firstAnchor": { "ancestors": [ "p", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20180102", "decimals": "-7", "first": true, "lang": null, "name": "us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100530 - Disclosure - Financing Arrangements - Financing - RSG Acquisition - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "shortName": "Financing Arrangements - Financing - RSG Acquisition - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapBusinessAcquisitionAxis_becnRoofingSupplyGroupMember_20181001_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:PaymentsOfDebtIssuanceCosts", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R55": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20151001", "decimals": "INF", "first": true, "lang": null, "name": "us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100540 - Disclosure - Financing Arrangements - 2020 ABL - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "shortName": "Financing Arrangements - 2020 ABL - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapCreditFacilityAxis_us-gaapRevolvingCreditFacilityMember_us-gaapDebtInstrumentAxis_becnTwoThousandAndTwentyAssetBasedRevolvingLineOfCreditMember_20151001_20151001", "decimals": null, "lang": "en-US", "name": "us-gaap:DebtInstrumentMaturityDate", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R56": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapCreditFacilityAxis_becnTermLoanMember_us-gaapDebtInstrumentAxis_becnTermLoanDueTwoThousandAndTwentyTwoMember_20151001", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:LineOfCredit", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100550 - Disclosure - Financing Arrangements - 2022 Term Loan - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "shortName": "Financing Arrangements - 2022 Term Loan - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapCreditFacilityAxis_becnTermLoanMember_us-gaapDebtInstrumentAxis_becnTermLoanDueTwoThousandAndTwentyTwoMember_20151001_20151001", "decimals": null, "lang": "en-US", "name": "us-gaap:DebtInstrumentRedemptionPeriodEndDate", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R57": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProceedsFromIssuanceOfSeniorLongTermDebt", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100560 - Disclosure - Financing Arrangements - 2023 Senior Notes - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "shortName": "Financing Arrangements - 2023 Senior Notes - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapDebtInstrumentAxis_becnSeniorNotesDueInOctoberTwoThousandTwentyThreeMember_20151001", "decimals": "INF", "lang": null, "name": "becn:DebtInstrumentCouponRate", "reportCount": 1, "unique": true, "unitRef": "U_xbrlipure", "xsiNil": "false" } }, "R58": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfDebtInstrumentsTextBlock", "us-gaap:DebtDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "becn:EquipmentFinancingFacilitiesBorrowingsOutstanding", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100570 - Disclosure - Financing Arrangements - Equipment Financing Facilities and Other - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "shortName": "Financing Arrangements - Equipment Financing Facilities and Other - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapLongtermDebtTypeAxis_us-gaapCapitalLeaseObligationsMember_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:CapitalLeaseObligations", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R59": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100580 - Disclosure - Commitments and Contingencies - Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail", "shortName": "Commitments and Contingencies - Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock", "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R6": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100050 - Statement - Consolidated Statements of Comprehensive Income", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome", "shortName": "Consolidated Statements of Comprehensive Income", "subGroupType": "", "uniqueAnchor": null }, "R60": { "firstAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:OperatingLeasesRentExpenseNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100590 - Disclosure - Commitments and Contingencies - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail", "shortName": "Commitments and Contingencies - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-5", "first": true, "lang": null, "name": "us-gaap:OperatingLeasesRentExpenseNet", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R61": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NoncurrentAssets", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100600 - Disclosure - Geographic Data - Schedule Of Geographic Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail", "shortName": "Geographic Data - Schedule Of Geographic Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock", "us-gaap:SegmentReportingDisclosureTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NoncurrentAssets", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R62": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100610 - Disclosure - Accumulated Other Comprehensive Income (Loss) - (Additional Information) (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail", "shortName": "Accumulated Other Comprehensive Income (Loss) - (Additional Information) (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:ComprehensiveIncomeNoteTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapStatementEquityComponentsAxis_us-gaapAccumulatedTranslationAdjustmentMember_20190401_20190630", "decimals": "-5", "lang": null, "name": "us-gaap:OciBeforeReclassificationsNetOfTaxAttributableToParent", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R63": { "firstAnchor": { "ancestors": [ "p", "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapDebtInstrumentAxis_becnSeniorNotesDueInOctoberTwoThousandTwentyThreeMember_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel2Member_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "becn:DebtInstrumentMaturityYear", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100620 - Disclosure - Fair Value Measurement - Additional Information (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail", "shortName": "Fair Value Measurement - Additional Information (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "us-gaap:FairValueDisclosuresTextBlock", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapDebtInstrumentAxis_becnSeniorNotesDueInOctoberTwoThousandTwentyThreeMember_us-gaapFairValueByFairValueHierarchyLevelAxis_us-gaapFairValueInputsLevel2Member_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "becn:DebtInstrumentMaturityYear", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } }, "R64": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:CashAndCashEquivalentsAtCarryingValue", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100630 - Disclosure - Supplemental Guarantor Information - Condensed Consolidating Balance Sheets (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "shortName": "Supplemental Guarantor Information - Condensed Consolidating Balance Sheets (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "srt:ScheduleOfCondensedBalanceSheetTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190630", "decimals": "-3", "lang": null, "name": "becn:IntercompanyReceivable", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R65": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100640 - Disclosure - Supplemental Guarantor Information - Condensed Consolidating Statements of Operations (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "shortName": "Supplemental Guarantor Information - Condensed Consolidating Statements of Operations (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "srt:ScheduleOfCondensedIncomeStatementTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "lang": null, "name": "becn:IntercompanyChargesIncomeExpenses", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R66": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20190401_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetIncomeLoss", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100650 - Disclosure - Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "shortName": "Supplemental Guarantor Information - Condensed Consolidating Statements of Comprehensive Income (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "srt:CondensedStatementOfComprehensiveIncomeTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_srtConsolidatedEntitiesAxis_srtParentCompanyMember_srtConsolidationItemsAxis_srtReportableLegalEntitiesMember_20190401_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R67": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:NetCashProvidedByUsedInOperatingActivities", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100660 - Disclosure - Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows (Detail)", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "shortName": "Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows (Detail)", "subGroupType": "details", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "srt:ScheduleOfCondensedCashFlowStatementTableTextBlock", "ix:continuation", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "-3", "lang": null, "name": "us-gaap:PaymentsForProceedsFromOtherInvestingActivities", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R7": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20170930", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:StockholdersEquity", "reportCount": 1, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100060 - Statement - Consolidated Statements of Stockholders' Equity", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity", "shortName": "Consolidated Statements of Stockholders' Equity", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_us-gaapStatementEquityComponentsAxis_us-gaapCommonStockMember_20170930", "decimals": "-3", "lang": null, "name": "us-gaap:StockholdersEquity", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R8": { "firstAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" }, "groupType": "statement", "isDefault": "false", "longName": "100070 - Statement - Consolidated Statements of Cash Flows", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows", "shortName": "Consolidated Statements of Cash Flows", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "p", "td", "tr", "table", "div", "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": "-3", "first": true, "lang": null, "name": "us-gaap:ProfitLoss", "reportCount": 1, "unique": true, "unitRef": "U_iso4217USD", "xsiNil": "false" } }, "R9": { "firstAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" }, "groupType": "disclosure", "isDefault": "false", "longName": "100080 - Disclosure - Company Overview", "role": "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverview", "shortName": "Company Overview", "subGroupType": "", "uniqueAnchor": { "ancestors": [ "body", "html" ], "baseRef": "becn-10q_20190630.htm", "contextRef": "C_0001124941_20181001_20190630", "decimals": null, "first": true, "lang": "en-US", "name": "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "reportCount": 1, "unique": true, "unitRef": null, "xsiNil": "false" } } }, "segmentCount": 55, "tag": { "becn_AlliedBuildingProductsCorporationAndAffiliatedEntityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Allied Building Products Corporation and Affiliated Entity.", "label": "Allied Building Products Corporation And Affiliated Entity [Member]", "terseLabel": "Allied Acquisition [Member]" } } }, "localname": "AlliedBuildingProductsCorporationAndAffiliatedEntityMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_AlliedFinancingArrangementsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Allied financing arrangements.", "label": "Allied Financing Arrangements [Member]", "terseLabel": "Allied Financing Arrangements [Member]" } } }, "localname": "AlliedFinancingArrangementsMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_AmortizationOfBeneficialLease": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10250.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amortization of beneficial lease.", "label": "Amortization Of Beneficial Lease", "terseLabel": "Beneficial lease amortization" } } }, "localname": "AmortizationOfBeneficialLease", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "becn_AtlasSupplyIncorporationMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Atlas Supply, Incorporation.", "label": "Atlas Supply Incorporation [Member]", "terseLabel": "Atlas Supply, Inc. [Member]" } } }, "localname": "AtlasSupplyIncorporationMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_BeneficialLeaseArrangementsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Beneficial Lease Arrangements [Member]", "label": "Beneficial Lease Arrangements [Member]", "terseLabel": "Beneficial Lease Arrangements [Member]" } } }, "localname": "BeneficialLeaseArrangementsMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "domainItemType" }, "becn_BusinessAcquisitionPurchasePriceAndTaxPosition": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Business acquisition Purchase price and tax position.", "label": "Business Acquisition Purchase Price And Tax Position", "terseLabel": "Business acquisition purchase price and tax position" } } }, "localname": "BusinessAcquisitionPurchasePriceAndTaxPosition", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "becn_BusinessCombinationNetWorkingCapitalAdjustment": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Business combination net working capital adjustment.", "label": "Business Combination Net Working Capital Adjustment", "terseLabel": "Net working capital adjustment" } } }, "localname": "BusinessCombinationNetWorkingCapitalAdjustment", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsReceivable": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10020.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Business combination provisional information initial accounting incomplete adjustment accounts receivable.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Accounts Receivable", "terseLabel": "Accounts receivable" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsReceivable", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Business combination provisional information initial accounting incomplete adjustment asset liability purchase price.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Asset Liability Purchase Price", "totalLabel": "Total purchase price" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10010.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Business combination provisional information initial accounting incomplete adjustment cash.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Cash", "terseLabel": "Cash" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentLiabilities": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10080.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Business combination provisional information initial accounting incomplete adjustment current liabilities.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Current Liabilities", "negatedLabel": "Current liabilities" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentLiabilities", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNonCurrentLiabilities": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10090.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Business combinaton provisional information initial accounting incomplete adjustment non-current liabilities.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Non Current Liabilities", "negatedLabel": "Non-current liabilities" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNonCurrentLiabilities", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPrepaidAndOtherCurrentAssets": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10040.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Business combination provisional information initial accounting incomplete adjustment prepaid and other current assets.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Prepaid And Other Current Assets", "terseLabel": "Prepaid and other current assets" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPrepaidAndOtherCurrentAssets", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "becn_CapitalLeaseObligationFixedInterestRate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Capital lease obligation fixed interest rate.", "label": "Capital Lease Obligation Fixed Interest Rate", "terseLabel": "Capital lease obligations, fixed interest rate percentage" } } }, "localname": "CapitalLeaseObligationFixedInterestRate", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "percentItemType" }, "becn_CompanyOverviewLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Company overview.", "label": "Company Overview [Line Items]", "terseLabel": "Company Overview [Line Items]" } } }, "localname": "CompanyOverviewLineItems", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "becn_CompanyOverviewTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Company Overview.", "label": "Company Overview [Table]", "terseLabel": "Company Overview [Table]" } } }, "localname": "CompanyOverviewTable", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "becn_ComplementaryBuildingProductsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Complementary Building Products [Member]", "label": "Complementary Building Products [Member]", "terseLabel": "Complementary Building Products [Member]" } } }, "localname": "ComplementaryBuildingProductsMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "domainItemType" }, "becn_DebtInstrumentCouponRate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Debt instrument coupon rate.", "label": "Debt Instrument Coupon Rate", "terseLabel": "Debt instrument, coupon rate" } } }, "localname": "DebtInstrumentCouponRate", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "becn_DebtInstrumentIssuePricePercentage": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Debt instrument issue price percentage.", "label": "Debt Instrument Issue Price Percentage", "terseLabel": "Debt instrument, issue price percentage" } } }, "localname": "DebtInstrumentIssuePricePercentage", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "becn_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.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "gYearItemType" }, "becn_DocumentAndEntityInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Document And Entity Information [Abstract]", "label": "Document And Entity Information [Abstract]" } } }, "localname": "DocumentAndEntityInformationAbstract", "nsuri": "http://www.beaconroofingsupply.com/20190630", "xbrltype": "stringItemType" }, "becn_EffectOfCommonShareEquivalents": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail": { "order": 10020.0, "parentTag": "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding", "weight": 1.0 } }, "lang": { "en-US": { "role": { "documentation": "Effect of common share equivalents.", "label": "Effect Of Common Share Equivalents", "terseLabel": "Effect of common share equivalents" } } }, "localname": "EffectOfCommonShareEquivalents", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail" ], "xbrltype": "sharesItemType" }, "becn_EquipmentFinancialFacilitiesAndOtherMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Equipment financial facilities and other.", "label": "Equipment Financial Facilities And Other [Member]", "terseLabel": "Equipment Financing Facilities and Other [Member]", "verboseLabel": "Equipment Financing Facilities [Member]" } } }, "localname": "EquipmentFinancialFacilitiesAndOtherMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "becn_EquipmentFinancingFacilitiesAndCapitalLeaseObligationsCurrent": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Equipment financing facilities and capital lease obligations current.", "label": "Equipment Financing Facilities And Capital Lease Obligations Current", "negatedLabel": "Current portion" } } }, "localname": "EquipmentFinancingFacilitiesAndCapitalLeaseObligationsCurrent", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "becn_EquipmentFinancingFacilitiesAndCapitalLeaseObligationsNoncurrent": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10140.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Equipment financing facilities and capital lease obligations noncurrent.", "label": "Equipment Financing Facilities And Capital Lease Obligations Noncurrent", "terseLabel": "Long-term obligations under equipment financing and other, net", "verboseLabel": "Long-term obligations under equipment financing and other, net" } } }, "localname": "EquipmentFinancingFacilitiesAndCapitalLeaseObligationsNoncurrent", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "becn_EquipmentFinancingFacilitiesBorrowingsOutstanding": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Equipment financing facilities borrowings outstanding.", "label": "Equipment Financing Facilities Borrowings Outstanding", "terseLabel": "Equipment financing facilities, various maturities through September 2021", "verboseLabel": "Equipment financing facilities, various maturities through September 2021" } } }, "localname": "EquipmentFinancingFacilitiesBorrowingsOutstanding", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "becn_FixedChargeCoverageRatio": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Minimum fixed charge ratio per covenant of senior secured credit facility.", "label": "Fixed Charge Coverage Ratio", "terseLabel": "Fixed charge coverage ratio" } } }, "localname": "FixedChargeCoverageRatio", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "becn_GoodwillAndIntangibleAssetsLineItems": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Goodwill And Intangible Assets [Line Items]", "label": "Goodwill And Intangible Assets [Line Items]", "terseLabel": "Goodwill And Intangible Assets [Line Items]" } } }, "localname": "GoodwillAndIntangibleAssetsLineItems", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "becn_GoodwillAndIntangibleAssetsTable": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Goodwill And Intangible Assets [Table]", "label": "Goodwill And Intangible Assets [Table]", "terseLabel": "Goodwill And Intangible Assets [Table]" } } }, "localname": "GoodwillAndIntangibleAssetsTable", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "becn_GoodwillIntangibleAssetsAndOtherAssetsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Goodwill Intangible Assets And Other Assets [Abstract]", "label": "Goodwill Intangible Assets And Other Assets [Abstract]" } } }, "localname": "GoodwillIntangibleAssetsAndOtherAssetsAbstract", "nsuri": "http://www.beaconroofingsupply.com/20190630", "xbrltype": "stringItemType" }, "becn_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": 10010.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Income Loss From Continuing Operations Before Income Loss From Equity Method Investments", "label": "Income Loss From Continuing Operations Before Income Loss From Equity Method Investments", "totalLabel": "Income (loss) before equity in net income of subsidiaries" } } }, "localname": "IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "monetaryItemType" }, "becn_IntercompanyChargesIncomeExpenses": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10090.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany Charges Income Expenses", "label": "Intercompany Charges Income Expenses", "terseLabel": "Intercompany charges (income)" } } }, "localname": "IntercompanyChargesIncomeExpenses", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "monetaryItemType" }, "becn_IntercompanyInterestExpensesIncome": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": 10070.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intercompany Interest Expenses Income", "label": "Intercompany Interest Expenses Income", "terseLabel": "Intercompany interest expense (income)" } } }, "localname": "IntercompanyInterestExpensesIncome", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "monetaryItemType" }, "becn_IntercompanyPayable": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10160.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount represents Intercompany payable.", "label": "Intercompany Payable", "terseLabel": "Intercompany payable, net" } } }, "localname": "IntercompanyPayable", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail" ], "xbrltype": "monetaryItemType" }, "becn_IntercompanyReceivable": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10250.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount represents Intercompany receivable.", "label": "Intercompany Receivable", "terseLabel": "Intercompany receivable, net" } } }, "localname": "IntercompanyReceivable", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail" ], "xbrltype": "monetaryItemType" }, "becn_InterestExpensesAndOtherFinancingCosts": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10240.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate amount of interest expenses and other financing costs.", "label": "Interest Expenses And Other Financing Costs", "terseLabel": "Certain interest expense and other financing costs" } } }, "localname": "InterestExpensesAndOtherFinancingCosts", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "becn_InterestIncomeExpense": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": 10060.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Interest (income) expense.", "label": "Interest Income Expense", "terseLabel": "Interest expense, financing costs, and other" } } }, "localname": "InterestIncomeExpense", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "monetaryItemType" }, "becn_InvestmentAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Investment agreement.", "label": "Investment Agreement [Member]", "terseLabel": "Investment Agreement [Member]" } } }, "localname": "InvestmentAgreementMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_LongTermDebtAndEquipmentFinancingFacilitiesAndCapitalLeaseObligationsCurrent": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10190.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Long term debt and equipment financing facilities and capital lease obligations current.", "label": "Long Term Debt And Equipment Financing Facilities And Capital Lease Obligations Current", "terseLabel": "Current portions of long-term debt/obligations" } } }, "localname": "LongTermDebtAndEquipmentFinancingFacilitiesAndCapitalLeaseObligationsCurrent", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "becn_NetIncomeLossAvailableToCommonStockholders": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail": { "order": 10030.0, "parentTag": "becn_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Net income (loss) available to common stockholders.", "label": "Net Income Loss Available To Common Stockholders", "totalLabel": "Net income (loss) attributable to common shareholders" } } }, "localname": "NetIncomeLossAvailableToCommonStockholders", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "becn_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Net Income loss available to common stockholders basic and diluted.", "label": "Net Income Loss Available To Common Stockholders Basic And Diluted", "totalLabel": "Net income (loss) attributable to common shareholders - basic and diluted" } } }, "localname": "NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail" ], "xbrltype": "monetaryItemType" }, "becn_NonresidentialRoofingProductsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Non-Residential Roofing Products [Member]", "label": "Nonresidential Roofing Products [Member]", "terseLabel": "Non-Residential Roofing Products [Member]" } } }, "localname": "NonresidentialRoofingProductsMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "domainItemType" }, "becn_NumberOfBusinessLocationsAcquired": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Represents the number of business locations acquired.", "label": "Number Of Business Locations Acquired", "terseLabel": "Number of business locations acquired" } } }, "localname": "NumberOfBusinessLocationsAcquired", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "integerItemType" }, "becn_NumberOfFinancialCovenants": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number Of Financial Covenants", "label": "Number Of Financial Covenants", "terseLabel": "Number of financial covenants" } } }, "localname": "NumberOfFinancialCovenants", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail" ], "xbrltype": "integerItemType" }, "becn_NumberOfProvincesInWhichEntityOperates": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of provinces in which entity operates.", "label": "Number Of Provinces In Which Entity Operates", "terseLabel": "Number of provinces in which entity operates" } } }, "localname": "NumberOfProvincesInWhichEntityOperates", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail" ], "xbrltype": "integerItemType" }, "becn_NumberOfStatesBusinessLocationsAcquired": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of states business locations acquired.", "label": "Number Of States Business Locations Acquired", "terseLabel": "Number of states business location acquired" } } }, "localname": "NumberOfStatesBusinessLocationsAcquired", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "integerItemType" }, "becn_PercentageOfFixedInterestRateOfEquipmentFinancingFacilities": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Percentage of fixed interest rate of equipment financing facilities.", "label": "Percentage Of Fixed Interest Rate Of Equipment Financing Facilities", "terseLabel": "Equipment financing facilities, fixed interest rate percentage", "verboseLabel": "Percentage of Fixed Interest Rate of Equipment Financing Facilities" } } }, "localname": "PercentageOfFixedInterestRateOfEquipmentFinancingFacilities", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "percentItemType" }, "becn_PreferredStockConversionPrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Preferred stock conversion price.", "label": "Preferred Stock Conversion Price", "terseLabel": "Preferred stock conversion price per share" } } }, "localname": "PreferredStockConversionPrice", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "perShareItemType" }, "becn_PreferredStockUndeclaredCumulativeDividends": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Preferred stock undeclared cumulative dividends.", "label": "Preferred Stock Undeclared Cumulative Dividends", "verboseLabel": "Cumulative preferred stock dividends undeclared" } } }, "localname": "PreferredStockUndeclaredCumulativeDividends", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperationsParenthetical" ], "xbrltype": "monetaryItemType" }, "becn_ProceedsFromIssuanceOfTermLoan": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10030.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10070.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Proceeds from issuance of term loan.", "label": "Proceeds From Issuance Of Term Loan", "terseLabel": "Borrowings under term loan" } } }, "localname": "ProceedsFromIssuanceOfTermLoan", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "becn_RepaymentsOfBorrowingsUnderEquipmentFinancingAndCapitalLeaseObligations": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10070.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Repayments of borrowings under equipment financing and capital lease obligations.", "label": "Repayments Of Borrowings Under Equipment Financing And Capital Lease Obligations", "negatedLabel": "Repayments under equipment financing facilities and other" } } }, "localname": "RepaymentsOfBorrowingsUnderEquipmentFinancingAndCapitalLeaseObligations", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail" ], "xbrltype": "monetaryItemType" }, "becn_RepaymentsOfBorrowingsUnderEquipmentFinancingFacilitiesAndOther": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10110.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Repayments of borrowings under equipment financing facilities and other.", "label": "Repayments Of Borrowings Under Equipment Financing Facilities And Other", "negatedLabel": "Repayments under equipment financing facilities and other" } } }, "localname": "RepaymentsOfBorrowingsUnderEquipmentFinancingFacilitiesAndOther", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "becn_RepaymentsOfTermLoan": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10040.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10080.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Repayments of term loan.", "label": "Repayments Of Term Loan", "negatedLabel": "Repayments under term loan" } } }, "localname": "RepaymentsOfTermLoan", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "becn_ResidentialRoofingProductsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Residential Roofing Products [Member]", "label": "Residential Roofing Products [Member]", "terseLabel": "Residential Roofing Products [Member]" } } }, "localname": "ResidentialRoofingProductsMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "domainItemType" }, "becn_RestrictedStockAwardsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Restricted stock awards.", "label": "Restricted Stock Awards [Member]", "terseLabel": "Restricted Stock Awards [Member]" } } }, "localname": "RestrictedStockAwardsMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_RoofingSupplyGroupMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Roofing supply group.", "label": "Roofing Supply Group [Member]", "terseLabel": "Roofing Supply Group [Member]" } } }, "localname": "RoofingSupplyGroupMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_ScheduleOfIntangiblesAndOtherAssetsTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule of intangibles and other assets.", "label": "Schedule Of Intangibles And Other Assets Table [Text Block]", "terseLabel": "Summary of Intangible Assets" } } }, "localname": "ScheduleOfIntangiblesAndOtherAssetsTableTextBlock", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsTables" ], "xbrltype": "textBlockItemType" }, "becn_ScheduleOfRestrictedStockUnitsAdditionalInformationTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Schedule of restricted stock units additional information.", "label": "Schedule Of Restricted Stock Units Additional Information Table [Text Block]", "terseLabel": "Schedule Of Restricted Stock Units Additional Information" } } }, "localname": "ScheduleOfRestrictedStockUnitsAdditionalInformationTableTextBlock", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "becn_ScheduleOfShareBasedCompensationAdditionalInformationTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the grant date fair value of option granted and vested and intrinsic value and net cash received on exercise of options.", "label": "Schedule Of Share Based Compensation Additional Information Table [Text Block]", "terseLabel": "Stock Option Grants, Vesting, and Exercises" } } }, "localname": "ScheduleOfShareBasedCompensationAdditionalInformationTableTextBlock", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "becn_SecuredTermLoanBFacilityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Secured term loan B facility.", "label": "Secured Term Loan B Facility [Member]", "terseLabel": "Secured Term Loan B Facility [Member]" } } }, "localname": "SecuredTermLoanBFacilityMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_SeniorNotesDueInNovemberTwoThousandTwentyFiveMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due in November two thousand twenty five.", "label": "Senior Notes Due In November Two Thousand Twenty Five [Member]", "terseLabel": "Senior Notes, Matures November 2025 [Member]", "verboseLabel": "Senior Notes Due in 2025 [Member]" } } }, "localname": "SeniorNotesDueInNovemberTwoThousandTwentyFiveMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "becn_SeniorNotesDueInOctoberTwoThousandTwentyThreeMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior notes due in October two thousand twenty three.", "label": "Senior Notes Due In October Two Thousand Twenty Three [Member]", "terseLabel": "Senior Notes, Matures October 2023 [Member]", "verboseLabel": "Senior Notes Due in 2023 [Member]" } } }, "localname": "SeniorNotesDueInOctoberTwoThousandTwentyThreeMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "becn_SeniorSecuredCreditFacilityMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Senior Secured Credit Facility [Member]", "label": "Senior Secured Credit Facility [Member]", "terseLabel": "Senior-secured Asset-based Revolving Line Of Credit [Member]" } } }, "localname": "SeniorSecuredCreditFacilityMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_SeriesACumulativeConvertibleParticipatingPreferredStockMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Series A cumulative convertible participating preferred stock.", "label": "Series A Cumulative Convertible Participating Preferred Stock [Member]", "terseLabel": "Series A Cumulative Convertible Participating Preferred Stock [Member]" } } }, "localname": "SeriesACumulativeConvertibleParticipatingPreferredStockMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpectedVestingRightsPercentage": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share based compensation arrangement by share based payment award award expected vesting rights percentage.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Award Expected Vesting Rights Percentage", "terseLabel": "Percentage of shares that will vest" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardExpectedVestingRightsPercentage", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "becn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestOutstandingNumber": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Number", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Outstanding Number", "terseLabel": "Vested and expected to vest after June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestOutstandingNumber", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "becn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Outstanding, Weighted Average Grant Date Fair Value", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested And Expected To Vest Outstanding Weighted Average Grant Date Fair Value", "terseLabel": "Vested and expected to vest after June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestOutstandingWeightedAverageGrantDateFairValue", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "becn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value [Abstract]", "terseLabel": "Aggregate Intrinsic Value" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueAbstract", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "becn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueIgnoreAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share-based compensation arrangement by share-based payment award, options, aggregate intrinsic value.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Aggregate Intrinsic Value Ignore [Abstract]", "terseLabel": "Weighted-Average Remaining Contractual Life" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAggregateIntrinsicValueIgnoreAbstract", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "becn_StockPurchaseAgreementMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Stock Purchase Agreement.", "label": "Stock Purchase Agreement [Member]", "terseLabel": "Stock Purchase Agreement [Member]" } } }, "localname": "StockPurchaseAgreementMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_SubsidiaryGuaranteesObligationsOfDebtDisclosureTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Entire disclosure of subsidiary guarantees obligations of debt.", "label": "Subsidiary Guarantees Obligations Of Debt Disclosure [Text Block]", "terseLabel": "Supplemental Guarantor Information" } } }, "localname": "SubsidiaryGuaranteesObligationsOfDebtDisclosureTextBlock", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformation" ], "xbrltype": "textBlockItemType" }, "becn_SupplementalGuarantorInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Supplemental Guarantor Information [Abstract]", "label": "Supplemental Guarantor Information [Abstract]" } } }, "localname": "SupplementalGuarantorInformationAbstract", "nsuri": "http://www.beaconroofingsupply.com/20190630", "xbrltype": "stringItemType" }, "becn_TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Tax cuts and jobs act of two thousand seventeen income tax expense benefit.", "label": "Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit", "negatedLabel": "Net income tax benefit" } } }, "localname": "TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperationsParenthetical" ], "xbrltype": "monetaryItemType" }, "becn_TermLoanDueInJanuaryTwoTwoThousandAndTwentyFiveMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Term loan due in January two, two thousand and twenty five.", "label": "Term Loan Due In January Two Two Thousand And Twenty Five [Member]", "terseLabel": "Term Loan, Matures January 2025 [Member]" } } }, "localname": "TermLoanDueInJanuaryTwoTwoThousandAndTwentyFiveMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "becn_TermLoanDueTwoThousandAndTwentyTwoMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Term loan due two thousand and twenty two.", "label": "Term Loan Due Two Thousand And Twenty Two [Member]", "terseLabel": "2022 Term Loan [Member]" } } }, "localname": "TermLoanDueTwoThousandAndTwentyTwoMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_TermLoanMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Term loan.", "label": "Term Loan [Member]", "terseLabel": "Term Loan [Member]" } } }, "localname": "TermLoanMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "becn_TermLoansAndSeniorNotesNet": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Term loans and senior notes net.", "label": "Term Loans And Senior Notes Net", "terseLabel": "Long-term debt, net" } } }, "localname": "TermLoansAndSeniorNotesNet", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "becn_TriStateBuilderSupplyMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Tri-State builder supply.", "label": "Tri State Builder Supply [Member]", "terseLabel": "Tri-State Builder Supply [Member]" } } }, "localname": "TriStateBuilderSupplyMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_TwoThousandAndTwentyAssetBasedRevolvingLineOfCreditMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "2020 Asset based revolving line of credit.", "label": "Two Thousand And Twenty Asset Based Revolving Line Of Credit [Member]", "terseLabel": "2020 ABL [Member]" } } }, "localname": "TwoThousandAndTwentyAssetBasedRevolvingLineOfCreditMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "becn_TwoThousandAndTwentyThreeAssetBasedRevolvingLineOfCreditMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "2023 Asset based revolving line of credit.", "label": "Two Thousand And Twenty Three Asset Based Revolving Line Of Credit [Member]", "terseLabel": "2023 ABL [Member]" } } }, "localname": "TwoThousandAndTwentyThreeAssetBasedRevolvingLineOfCreditMember", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "becn_UnamortizedStockIssuanceCosts": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Unamortized stock issuance costs.", "label": "Unamortized Stock Issuance Costs", "verboseLabel": "Unamortized issuance costs" } } }, "localname": "UnamortizedStockIssuanceCosts", "nsuri": "http://www.beaconroofingsupply.com/20190630", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "country_CA": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "CANADA", "terseLabel": "Canada [Member]", "verboseLabel": "Canada [Member]" } } }, "localname": "CA", "nsuri": "http://xbrl.sec.gov/country/2017-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "domainItemType" }, "country_US": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "UNITED STATES", "terseLabel": "U.S. [Member]", "verboseLabel": "United States [Member]" } } }, "localname": "US", "nsuri": "http://xbrl.sec.gov/country/2017-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "domainItemType" }, "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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityAddressAddressLine2": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Address Line 2 such as Suite No.", "label": "Entity Address Address Line2", "terseLabel": "Entity Address, Address Line Two" } } }, "localname": "EntityAddressAddressLine2", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityCentralIndexKey": { "auth_ref": [ "r319" ], "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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "yesNoItemType" }, "dei_EntityEmergingGrowthCompany": { "auth_ref": [ "r319" ], "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.beaconroofingsupply.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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "fileNumberItemType" }, "dei_EntityFilerCategory": { "auth_ref": [ "r319" ], "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", "verboseLabel": "Entity Filer Category" } } }, "localname": "EntityFilerCategory", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "filerCategoryItemType" }, "dei_EntityIncorporationDateOfIncorporation": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Date when an entity was incorporated", "label": "Entity Incorporation Date Of Incorporation", "terseLabel": "Date of incorporation" } } }, "localname": "EntityIncorporationDateOfIncorporation", "nsuri": "http://xbrl.sec.gov/dei/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail" ], "xbrltype": "dateItemType" }, "dei_EntityRegistrantName": { "auth_ref": [ "r319" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "dei_EntityShellCompany": { "auth_ref": [ "r319" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntitySmallBusiness": { "auth_ref": [ "r319" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "booleanItemType" }, "dei_EntityTaxIdentificationNumber": { "auth_ref": [ "r319" ], "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.beaconroofingsupply.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.beaconroofingsupply.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.beaconroofingsupply.com/20190630/taxonomy/role/DocumentDocumentAndEntityInformation" ], "xbrltype": "normalizedStringItemType" }, "srt_CondensedStatementOfComprehensiveIncomeTableTextBlock": { "auth_ref": [ "r325" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of condensed statement of comprehensive income (loss) including, but not limited to, statements of comprehensive income (loss) of consolidated entities and consolidation eliminations.", "label": "Condensed Statement Of Comprehensive Income Table [Text Block]", "terseLabel": "Condensed Consolidating Statements of Comprehensive Income" } } }, "localname": "CondensedStatementOfComprehensiveIncomeTableTextBlock", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationTables" ], "xbrltype": "textBlockItemType" }, "srt_ConsolidatedEntitiesAxis": { "auth_ref": [ "r318", "r321" ], "lang": { "en-US": { "role": { "documentation": "Information by consolidated entity or group of entities.", "label": "Consolidated Entities [Axis]", "terseLabel": "Consolidated Entities" } } }, "localname": "ConsolidatedEntitiesAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "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 and Other [Member]" } } }, "localname": "ConsolidationEliminationsMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "domainItemType" }, "srt_ConsolidationItemsAxis": { "auth_ref": [ "r116", "r123" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "domainItemType" }, "srt_GuarantorSubsidiariesMember": { "auth_ref": [ "r162", "r323" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "domainItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "srt_NonGuarantorSubsidiariesMember": { "auth_ref": [ "r163", "r324" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "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 Company [Member]" } } }, "localname": "ParentCompanyMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "domainItemType" }, "srt_ProductOrServiceAxis": { "auth_ref": [ "r125", "r179", "r181", "r315" ], "lang": { "en-US": { "role": { "documentation": "Information by product and service, or group of similar products and similar services.", "label": "Product Or Service [Axis]", "terseLabel": "Product and Service" } } }, "localname": "ProductOrServiceAxis", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "stringItemType" }, "srt_ProductsAndServicesDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Product or service, or a group of similar products or similar services.", "label": "Products And Services [Domain]", "terseLabel": "Product and Service" } } }, "localname": "ProductsAndServicesDomain", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "srt_ReportableLegalEntitiesMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Legal entities of the consolidated entity reporting separate financial information in the entity's financial statements.", "label": "Reportable Legal Entities [Member]", "terseLabel": "Reportable Legal Entities [Member]" } } }, "localname": "ReportableLegalEntitiesMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "xbrltype": "domainItemType" }, "srt_ScheduleOfCondensedBalanceSheetTableTextBlock": { "auth_ref": [ "r325" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationTables" ], "xbrltype": "textBlockItemType" }, "srt_ScheduleOfCondensedCashFlowStatementTableTextBlock": { "auth_ref": [ "r325" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationTables" ], "xbrltype": "textBlockItemType" }, "srt_ScheduleOfCondensedIncomeStatementTableTextBlock": { "auth_ref": [ "r325" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationTables" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "domainItemType" }, "srt_StatementGeographicalAxis": { "auth_ref": [ "r127", "r179", "r182", "r316", "r317", "r320", "r322" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "stringItemType" }, "srt_WeightedAverageMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Average of a range of values, calculated with consideration of proportional relevance.", "label": "Weighted Average [Member]", "terseLabel": "Weighted Average [Member]" } } }, "localname": "WeightedAverageMember", "nsuri": "http://fasb.org/srt/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "domainItemType" }, "stpr_CA": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "CALIFORNIA", "terseLabel": "Canada [Member]" } } }, "localname": "CA", "nsuri": "http://xbrl.sec.gov/stpr/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "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_AccountsPayableCurrent": { "auth_ref": [ "r27" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10170.0, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccountsReceivableNetCurrent": { "auth_ref": [ "r16", "r180" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10290.0, "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, less allowance of $24,732, $17,584 and $13,963 as of June 30, 2019, September 30, 2018 and June 30, 2018, respectively", "verboseLabel": "Accounts receivable, net" } } }, "localname": "AccountsReceivableNetCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_AccruedLiabilitiesCurrent": { "auth_ref": [ "r30" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10180.0, "parentTag": "us-gaap_LiabilitiesCurrent", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).", "label": "Accrued Liabilities Current", "terseLabel": "Accrued expenses" } } }, "localname": "AccruedLiabilitiesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax": { "auth_ref": [ "r45", "r46", "r47" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10090.0, "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", "terseLabel": "Accumulated other comprehensive income (loss)" } } }, "localname": "AccumulatedOtherComprehensiveIncomeLossNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_AccumulatedOtherComprehensiveIncomeMember": { "auth_ref": [ "r44", "r47", "r48", "r255" ], "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": "Accumulated Other Comprehensive Income (Loss) [Member]" } } }, "localname": "AccumulatedOtherComprehensiveIncomeMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_AccumulatedTranslationAdjustmentMember": { "auth_ref": [ "r42", "r47", "r48", "r255" ], "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": "Foreign Currency Translation [Member]" } } }, "localname": "AccumulatedTranslationAdjustmentMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_AdditionalPaidInCapitalCommonStock": { "auth_ref": [ "r17" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10070.0, "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": "Additional paid-in capital" } } }, "localname": "AdditionalPaidInCapitalCommonStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "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": "Additional Paid-in Capital [Member]" } } }, "localname": "AdditionalPaidInCapitalMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue": { "auth_ref": [ "r188", "r190", "r225", "r226" ], "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": "Stock-based compensation" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts": { "auth_ref": [ "r169", "r175" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.", "label": "Adjustments To Additional Paid In Capital Stock Issued Issuance Costs", "negatedLabel": "Issuance costs related to secondary offering of common stock" } } }, "localname": "AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "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 net income to net cash provided by operating activities:" } } }, "localname": "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_AllocatedShareBasedCompensationExpense": { "auth_ref": [ "r190", "r220", "r224" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.", "label": "Allocated Share Based Compensation Expense", "terseLabel": "Allocated stock-based compensation expense" } } }, "localname": "AllocatedShareBasedCompensationExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent": { "auth_ref": [ "r39", "r129" ], "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": "Accounts receivable, allowances" } } }, "localname": "AllowanceForDoubtfulAccountsReceivableCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_AmortizationOfIntangibleAssets": { "auth_ref": [ "r83", "r141", "r149" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10120.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.", "label": "Amortization Of Intangible Assets", "terseLabel": "Amortization", "verboseLabel": "Amortization of Intangible Assets" } } }, "localname": "AmortizationOfIntangibleAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount": { "auth_ref": [ "r104" ], "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": "Anti-dilutive securities excluded from computation of diluted net income (loss) per share" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems": { "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": "Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]", "terseLabel": "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]" } } }, "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ArrangementsAndNonarrangementTransactionsMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "This item is to be populated with the collective of (i) types (categories) of arrangements of the entity applicable to its revenue-generating activities or operations and non-arrangement transactions, including but not limited to, for instance, sales of product manufactured by the entity, if such comparison of arrangements as a component of all transactions is provided by the entity.", "label": "Arrangements And Nonarrangement Transactions [Member]", "terseLabel": "Arrangements and Non-arrangement Transactions" } } }, "localname": "ArrangementsAndNonarrangementTransactionsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_Assets": { "auth_ref": [ "r120", "r290", "r305" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "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", "totalLabel": "Total assets" } } }, "localname": "Assets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_AssetsCurrent": { "auth_ref": [ "r3", "r4", "r41" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10200.0, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_AssetsCurrentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Assets Current [Abstract]", "terseLabel": "Current assets:" } } }, "localname": "AssetsCurrentAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_AwardTypeAxis": { "auth_ref": [ "r192", "r222" ], "lang": { "en-US": { "role": { "documentation": "Information by award type pertaining to equity-based compensation.", "label": "Award Type [Axis]", "terseLabel": "Award Type" } } }, "localname": "AwardTypeAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_BusinessAcquisitionAxis": { "auth_ref": [ "r237", "r238" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "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]" } } }, "localname": "BusinessAcquisitionLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount": { "auth_ref": [ "r247" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.", "label": "Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount", "terseLabel": "Business acquisition, goodwill, tax deductible amount" } } }, "localname": "BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessAcquisitionsProFormaRevenue": { "auth_ref": [ "r235", "r236" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.", "label": "Business Acquisitions Pro Forma Revenue", "terseLabel": "Business acquisition, sales reported by acquired entity for last annual period" } } }, "localname": "BusinessAcquisitionsProFormaRevenue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationDisclosureTextBlock": { "auth_ref": [ "r248" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitions" ], "xbrltype": "textBlockItemType" }, "us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles": { "auth_ref": [ "r242" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10070.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Intangibles", "terseLabel": "Intangible assets" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventory": { "auth_ref": [ "r242" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10030.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to inventory acquired in connection with a business combination for which the initial accounting was incomplete.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Inventory", "terseLabel": "Inventory" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventory", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment": { "auth_ref": [ "r242" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10050.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete.", "label": "Business Combination Provisional Information Initial Accounting Incomplete Adjustment Property Plant And Equipment", "terseLabel": "Property, plant, and equipment" } } }, "localname": "BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents": { "auth_ref": [ "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10100.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "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" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets": { "auth_ref": [ "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10130.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Prepaid Expense And Other Assets", "terseLabel": "Prepaid and other current assets" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables": { "auth_ref": [ "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10110.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Receivables", "terseLabel": "Accounts receivable" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities": { "auth_ref": [ "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10170.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of 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", "negatedLabel": "Current liabilities" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill": { "auth_ref": [ "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10160.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "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", "verboseLabel": "Business acquisitions purchase price allocation intangible assets other than goodwill" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory": { "auth_ref": [ "r239", "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10120.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of inventory recognized as of the acquisition date.", "label": "Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Inventory", "terseLabel": "Inventory" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities": { "auth_ref": [ "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10180.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of 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", "negatedLabel": "Non-current liabilities" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment": { "auth_ref": [ "r239", "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10140.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "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" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet": { "auth_ref": [ "r240" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.", "label": "Business Combination Recognized Identifiable Assets Acquired Goodwill And Liabilities Assumed Net", "terseLabel": "Adjusted purchase price", "totalLabel": "Total purchase price" } } }, "localname": "BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems": { "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 Combination Separately Recognized Transactions [Line Items]", "terseLabel": "Business Combination Separately Recognized Transactions [Line Items]" } } }, "localname": "BusinessCombinationSeparatelyRecognizedTransactionsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "stringItemType" }, "us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable": { "auth_ref": [ "r234" ], "lang": { "en-US": { "role": { "documentation": "Schedule detailing the disclosures related to transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination by type of transaction.", "label": "Business Combination Separately Recognized Transactions [Table]", "terseLabel": "Business Combination Separately Recognized Transactions [Table]" } } }, "localname": "BusinessCombinationSeparatelyRecognizedTransactionsTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail" ], "xbrltype": "stringItemType" }, "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_CapitalLeaseObligations": { "auth_ref": [ "r11", "r286", "r306" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.", "label": "Capital Lease Obligations", "terseLabel": "Capital lease obligations, various maturities through November 2021", "verboseLabel": "Capital lease obligations, various maturities through November 2021" } } }, "localname": "CapitalLeaseObligations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_CapitalLeaseObligationsMember": { "auth_ref": [ "r286" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "us-gaap_CapitalLeasesOfLessorContingentRentalsBasisSpreadOnVariableRate": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The percentage points added to the reference rate to compute the variable rate on the lessor's capital lease (sales-type and direct financing leases).", "label": "Capital Leases Of Lessor Contingent Rentals Basis Spread On Variable Rate", "verboseLabel": "Capital Leases of Lessor, Contingent Rentals, Basis Spread on Variable Rate" } } }, "localname": "CapitalLeasesOfLessorContingentRentalsBasisSpreadOnVariableRate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "us-gaap_CarryingReportedAmountFairValueDisclosureMember": { "auth_ref": [ "r266", "r267" ], "lang": { "en-US": { "role": { "documentation": "Measured as reported on the statement of financial position (balance sheet).", "label": "Carrying Reported Amount Fair Value Disclosure [Member]", "terseLabel": "Carrying Value [Member]" } } }, "localname": "CarryingReportedAmountFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_CashAndCashEquivalentsAtCarryingValue": { "auth_ref": [ "r1", "r24", "r85" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10280.0, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": { "auth_ref": [ "r79", "r85", "r87" ], "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 and cash equivalents, end of period", "periodStartLabel": "Cash and cash equivalents, beginning of period" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect": { "auth_ref": [ "r79", "r272" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "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": "Net increase (decrease) in cash and cash equivalents" } } }, "localname": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ClassOfStockDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share of stock differentiated by the voting rights the holder receives. Examples include, but are not limited to, common stock, redeemable preferred stock, nonredeemable preferred stock, and convertible stock.", "label": "Class Of Stock [Domain]", "terseLabel": "Class of Stock" } } }, "localname": "ClassOfStockDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_CommitmentsAndContingencies": { "auth_ref": [ "r36", "r157", "r295", "r310" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10020.0, "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 9)" } } }, "localname": "CommitmentsAndContingencies", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_CommitmentsAndContingenciesDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Commitments And Contingencies Disclosure [Abstract]" } } }, "localname": "CommitmentsAndContingenciesDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock": { "auth_ref": [ "r156", "r158" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingencies" ], "xbrltype": "textBlockItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_CommonStockParOrStatedValuePerShare": { "auth_ref": [ "r15" ], "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 (voting), par value", "verboseLabel": "Common stock, par value" } } }, "localname": "CommonStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_CommonStockSharesAuthorized": { "auth_ref": [ "r15" ], "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 (voting), shares authorized" } } }, "localname": "CommonStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesIssued": { "auth_ref": [ "r15" ], "lang": { "en-US": { "role": { "documentation": "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.", "label": "Common Stock Shares Issued", "terseLabel": "Common Stock (voting), issued" } } }, "localname": "CommonStockSharesIssued", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockSharesOutstanding": { "auth_ref": [ "r15", "r169" ], "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", "terseLabel": "Common Stock (voting), outstanding" } } }, "localname": "CommonStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_CommonStockValue": { "auth_ref": [ "r15" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10050.0, "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 (voting); $0.01 par value; 100,000,000 shares authorized; 68,480,751, 68,135,790 and 68,105,113 shares issued and outstanding as of June 30, 2019, September 30, 2018 and June 30, 2018, respectively" } } }, "localname": "CommonStockValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomeNetOfTax": { "auth_ref": [ "r51", "r53", "r54" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome": { "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", "totalLabel": "Comprehensive income (loss)" } } }, "localname": "ComprehensiveIncomeNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_ComprehensiveIncomeNoteTextBlock": { "auth_ref": [ "r64" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.", "label": "Comprehensive Income Note [Text Block]", "terseLabel": "Accumulated Other Comprehensive Income (Loss)" } } }, "localname": "ComprehensiveIncomeNoteTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLoss" ], "xbrltype": "textBlockItemType" }, "us-gaap_CostOfGoodsAndServicesSold": { "auth_ref": [ "r61" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10140.0, "parentTag": "us-gaap_GrossProfit", "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 products sold" } } }, "localname": "CostOfGoodsAndServicesSold", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail" ], "xbrltype": "domainItemType" }, "us-gaap_CustomerRelationshipsMember": { "auth_ref": [ "r245" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "domainItemType" }, "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": [ "r167" ], "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": "Financing Arrangements" } } }, "localname": "DebtDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements" ], "xbrltype": "textBlockItemType" }, "us-gaap_DebtInstrumentAxis": { "auth_ref": [ "r9", "r10", "r11", "r291", "r292", "r304" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "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", "positiveLabel": "Base borrowing rates" } } }, "localname": "DebtInstrumentBasisSpreadOnVariableRate1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "us-gaap_DebtInstrumentFaceAmount": { "auth_ref": [ "r279", "r281" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentFairValue": { "auth_ref": [ "r265" ], "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": "Senior notes" } } }, "localname": "DebtInstrumentFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentFrequencyOfPeriodicPayment": { "auth_ref": [ "r34", "r301" ], "lang": { "en-US": { "role": { "documentation": "Description of the frequency of periodic payments (monthly, quarterly, annual).", "label": "Debt Instrument Frequency Of Periodic Payment", "terseLabel": "Debt Instrument, Frequency of Periodic Payment" } } }, "localname": "DebtInstrumentFrequencyOfPeriodicPayment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentInterestRateStatedPercentage": { "auth_ref": [ "r32" ], "lang": { "en-US": { "role": { "documentation": "Contractual interest rate for funds borrowed, under the debt agreement.", "label": "Debt Instrument Interest Rate Stated Percentage", "terseLabel": "Debt interest rate at period end", "verboseLabel": "Debt instrument interest rate" } } }, "localname": "DebtInstrumentInterestRateStatedPercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "percentItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentMaturityDate": { "auth_ref": [ "r33", "r261" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "dateItemType" }, "us-gaap_DebtInstrumentNameDomain": { "auth_ref": [ "r34" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "us-gaap_DebtInstrumentPeriodicPayment": { "auth_ref": [ "r34", "r301" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of the required periodic payments including both interest and principal payments.", "label": "Debt Instrument Periodic Payment", "terseLabel": "Debt Instrument, Periodic Payment" } } }, "localname": "DebtInstrumentPeriodicPayment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_DebtInstrumentRedemptionPeriodEndDate": { "auth_ref": [ "r302" ], "lang": { "en-US": { "role": { "documentation": "End date of debt instrument redemption period, in CCYY-MM-DD format.", "label": "Debt Instrument Redemption Period End Date", "terseLabel": "Debt instrument paid off date" } } }, "localname": "DebtInstrumentRedemptionPeriodEndDate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail" ], "xbrltype": "dateItemType" }, "us-gaap_DebtInstrumentTable": { "auth_ref": [ "r34", "r91", "r170", "r172", "r173", "r174", "r278", "r279", "r281", "r303" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "stringItemType" }, "us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet": { "auth_ref": [ "r164", "r280" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of unamortized debt discount (premium) and debt issuance costs.", "label": "Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net", "terseLabel": "Unamortized debt issuance costs" } } }, "localname": "DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredIncomeTaxesAndTaxCredits": { "auth_ref": [ "r84" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10280.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of deferred income tax expense (benefit) and income tax credits.", "label": "Deferred Income Taxes And Tax Credits", "terseLabel": "Deferred income taxes" } } }, "localname": "DeferredIncomeTaxesAndTaxCredits", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent": { "auth_ref": [ "r228", "r229", "r231" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10270.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting and classified as noncurrent.", "label": "Deferred Tax Assets Liabilities Net Noncurrent", "verboseLabel": "Deferred income taxes, net" } } }, "localname": "DeferredTaxAssetsLiabilitiesNetNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_DeferredTaxLiabilitiesNoncurrent": { "auth_ref": [ "r228", "r229", "r230" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10130.0, "parentTag": "us-gaap_Liabilities", "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, net" } } }, "localname": "DeferredTaxLiabilitiesNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_Depreciation": { "auth_ref": [ "r83", "r154" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10110.0, "parentTag": "us-gaap_OperatingExpenses", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.", "label": "Depreciation", "terseLabel": "Depreciation" } } }, "localname": "Depreciation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_DepreciationAndAmortization": { "auth_ref": [ "r83", "r154" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10220.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.", "label": "Depreciation And Amortization", "terseLabel": "Depreciation and amortization" } } }, "localname": "DepreciationAndAmortization", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail" ], "xbrltype": "stringItemType" }, "us-gaap_DisaggregationOfRevenueTableTextBlock": { "auth_ref": [ "r179" ], "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": "Summary of Net Sales by Product Line and Geography" } } }, "localname": "DisaggregationOfRevenueTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock": { "auth_ref": [ "r176", "r227" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.", "label": "Disclosure Of Compensation Related Costs Share Based Payments [Text Block]", "terseLabel": "Stock-based Compensation" } } }, "localname": "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensation" ], "xbrltype": "textBlockItemType" }, "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]" } } }, "localname": "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_DividendsPreferredStock": { "auth_ref": [ "r175", "r300" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).", "label": "Dividends Preferred Stock", "negatedLabel": "Dividends on preferred shares" } } }, "localname": "DividendsPreferredStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_DividendsPreferredStockCash": { "auth_ref": [ "r175", "r300" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.", "label": "Dividends Preferred Stock Cash", "verboseLabel": "Preferred stock dividends declared and paid" } } }, "localname": "DividendsPreferredStockCash", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperationsParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_EarningsPerShareAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Earnings Per Share [Abstract]", "terseLabel": "Net income (loss) per share:" } } }, "localname": "EarningsPerShareAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "stringItemType" }, "us-gaap_EarningsPerShareBasic": { "auth_ref": [ "r59", "r96", "r99", "r101", "r102", "r103", "r106", "r298", "r314" ], "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", "verboseLabel": "Net income (loss) per share - basic" } } }, "localname": "EarningsPerShareBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareDiluted": { "auth_ref": [ "r59", "r96", "r99", "r101", "r102", "r103", "r106", "r298", "r314" ], "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", "verboseLabel": "Net income (loss) per share - diluted" } } }, "localname": "EarningsPerShareDiluted", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "perShareItemType" }, "us-gaap_EarningsPerShareTextBlock": { "auth_ref": [ "r107" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for earnings per share.", "label": "Earnings Per Share [Text Block]", "terseLabel": "Net Income (Loss) Per Share" } } }, "localname": "EarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShare" ], "xbrltype": "textBlockItemType" }, "us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations": { "auth_ref": [ "r272" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "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 and cash equivalents" } } }, "localname": "EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized": { "auth_ref": [ "r221" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Unrecognized cost of unvested share-based compensation awards.", "label": "Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized", "terseLabel": "Unrecognized compensation cost related to unvested stock" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1": { "auth_ref": [ "r221" ], "lang": { "en-US": { "role": { "documentation": "Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1", "terseLabel": "Unrecognized compensation cost related to unvested stock, expected weighted-average period of recognition" } } }, "localname": "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "durationItemType" }, "us-gaap_EmployeeStockOptionMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "An arrangement whereby an employee is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Although there are variations, normally, after vesting, when an option is exercised, the employee-holder pays the strike value in cash to the issuing employer-entity and receives equity shares. The equity shares can be sold into the market for cash at the current market price without restriction. Options may be used to attract, retain and incentivize employees, in addition to their regular salary and other benefits.", "label": "Employee Stock Option [Member]", "terseLabel": "Stock Options [Member]" } } }, "localname": "EmployeeStockOptionMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_EquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Equity [Abstract]" } } }, "localname": "EquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_EquityComponentDomain": { "auth_ref": [ "r169" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "domainItemType" }, "us-gaap_EstimateOfFairValueFairValueDisclosureMember": { "auth_ref": [ "r265" ], "lang": { "en-US": { "role": { "documentation": "Measured as an estimate of fair value.", "label": "Estimate Of Fair Value Fair Value Disclosure [Member]", "terseLabel": "Fair Value [Member]" } } }, "localname": "EstimateOfFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueByFairValueHierarchyLevelAxis": { "auth_ref": [ "r184", "r185", "r186", "r260", "r287" ], "lang": { "en-US": { "role": { "documentation": "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.", "label": "Fair Value By Fair Value Hierarchy Level [Axis]", "terseLabel": "Fair Value Hierarchy and NAV" } } }, "localname": "FairValueByFairValueHierarchyLevelAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueByMeasurementBasisAxis": { "auth_ref": [ "r259", "r262" ], "lang": { "en-US": { "role": { "documentation": "Information by measurement basis.", "label": "Fair Value By Measurement Basis [Axis]", "terseLabel": "Measurement Basis" } } }, "localname": "FairValueByMeasurementBasisAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems": { "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 Concentration Of Risk Financial Statement Captions [Line Items]", "terseLabel": "Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]" } } }, "localname": "FairValueConcentrationOfRiskFinancialStatementCaptionsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueConcentrationOfRiskTable": { "auth_ref": [ "r268", "r269", "r270", "r271" ], "lang": { "en-US": { "role": { "documentation": "Summarization of information required and determined to be disclosed concerning all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. Such disclosure may also include quantitative information about the market risks of financial instruments that is consistent with the way the Company manages or adjusts those risks.", "label": "Fair Value Concentration Of Risk [Table]", "terseLabel": "Fair Value Concentration Of Risk [Table]" } } }, "localname": "FairValueConcentrationOfRiskTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_FairValueDisclosureItemAmountsDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Measurement basis, for example, but not limited to, reported value, fair value, portion at fair value, portion at other than fair value.", "label": "Fair Value Disclosure Item Amounts [Domain]", "terseLabel": "Fair Value Measurement" } } }, "localname": "FairValueDisclosureItemAmountsDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "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": [ "r263" ], "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 Measurement" } } }, "localname": "FairValueDisclosuresTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurement" ], "xbrltype": "textBlockItemType" }, "us-gaap_FairValueInputsLevel2Member": { "auth_ref": [ "r184", "r185", "r186", "r260", "r288" ], "lang": { "en-US": { "role": { "documentation": "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.", "label": "Fair Value Inputs Level2 [Member]", "terseLabel": "Fair Value, Inputs, Level 2 [Member]" } } }, "localname": "FairValueInputsLevel2Member", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_FairValueMeasurementsFairValueHierarchyDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Categories used to prioritize the inputs to valuation techniques to measure fair value.", "label": "Fair Value Measurements Fair Value Hierarchy [Domain]", "terseLabel": "Fair Value Hierarchy and NAV" } } }, "localname": "FairValueMeasurementsFairValueHierarchyDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "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 Asset, Useful Life" } } }, "localname": "FiniteLivedIntangibleAssetUsefulLife", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "durationItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization": { "auth_ref": [ "r148" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail": { "order": 10040.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Finite Lived Intangible Assets Accumulated Amortization", "negatedLabel": "Accumulated amortization" } } }, "localname": "FiniteLivedIntangibleAssetsAccumulatedAmortization", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail": { "order": 10060.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized 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": "Finite Lived Intangible Assets Amortization Expense After Year Five", "terseLabel": "Thereafter" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail": { "order": 10010.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized 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": "Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year", "terseLabel": "2019 (July - Sept)" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive": { "auth_ref": [ "r150" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail": { "order": 10050.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during 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": "Finite Lived Intangible Assets Amortization Expense Year Five", "terseLabel": "2023" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearFive", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour": { "auth_ref": [ "r150" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail": { "order": 10040.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during 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": "Finite Lived Intangible Assets Amortization Expense Year Four", "terseLabel": "2022" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearFour", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree": { "auth_ref": [ "r150" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail": { "order": 10030.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during 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": "Finite Lived Intangible Assets Amortization Expense Year Three", "terseLabel": "2021" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearThree", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo": { "auth_ref": [ "r150" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail": { "order": 10020.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during 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": "Finite Lived Intangible Assets Amortization Expense Year Two", "terseLabel": "2020" } } }, "localname": "FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis": { "auth_ref": [ "r142", "r145", "r148", "r152", "r289" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsGross": { "auth_ref": [ "r148", "r289" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail": { "order": 10030.0, "parentTag": "us-gaap_FiniteLivedIntangibleAssetsNet", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Finite Lived Intangible Assets Gross", "terseLabel": "Amortizable intangible assets" } } }, "localname": "FiniteLivedIntangibleAssetsGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FiniteLivedIntangibleAssetsLineItems": { "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": "Finite Lived Intangible Assets [Line Items]", "terseLabel": "Finite Lived Intangible Assets [Line Items]" } } }, "localname": "FiniteLivedIntangibleAssetsLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "stringItemType" }, "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain": { "auth_ref": [ "r142", "r147" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "domainItemType" }, "us-gaap_FiniteLivedIntangibleAssetsNet": { "auth_ref": [ "r148" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail": { "order": 10010.0, "parentTag": "us-gaap_IntangibleAssetsNetExcludingGoodwill", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Finite Lived Intangible Assets Net", "totalLabel": "Total amortizable intangible assets, net" } } }, "localname": "FiniteLivedIntangibleAssetsNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfEstimatedFutureAmortizationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_FinitelivedIntangibleAssetsAcquired1": { "auth_ref": [ "r143" ], "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": "Finite-lived Intangible Assets Acquired" } } }, "localname": "FinitelivedIntangibleAssetsAcquired1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_GainLossOnSaleOfPropertyPlantEquipment": { "auth_ref": [ "r83" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10270.0, "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 on sale of fixed assets" } } }, "localname": "GainLossOnSaleOfPropertyPlantEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_GainsLossesOnExtinguishmentOfDebt": { "auth_ref": [ "r83", "r165", "r166" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10260.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "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", "negatedLabel": "Loss on debt extinguishment", "terseLabel": "Gains (Losses) on Extinguishment of Debt" } } }, "localname": "GainsLossesOnExtinguishmentOfDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_Goodwill": { "auth_ref": [ "r134", "r135" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10150.0, "parentTag": "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10220.0, "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": "Ending balance", "periodStartLabel": "Beginning balance", "terseLabel": "Goodwill", "verboseLabel": "Business acquisitions purchase price allocation goodwill amount" } } }, "localname": "Goodwill", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfChangesInGoodwillDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Goodwill And Intangible Assets Disclosure [Abstract]" } } }, "localname": "GoodwillAndIntangibleAssetsDisclosureAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "xbrltype": "stringItemType" }, "us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock": { "auth_ref": [ "r153" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for goodwill and intangible assets.", "label": "Goodwill And Intangible Assets Disclosure [Text Block]", "terseLabel": "Goodwill and Intangible Assets" } } }, "localname": "GoodwillAndIntangibleAssetsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssets" ], "xbrltype": "textBlockItemType" }, "us-gaap_GoodwillForeignCurrencyTranslationGainLoss": { "auth_ref": [ "r136" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.", "label": "Goodwill Foreign Currency Translation Gain Loss", "terseLabel": "Translation and other adjustments" } } }, "localname": "GoodwillForeignCurrencyTranslationGainLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfChangesInGoodwillDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_GoodwillPurchaseAccountingAdjustments": { "auth_ref": [ "r137", "r233" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail": { "order": 10060.0, "parentTag": "becn_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetLiabilityPurchasePrice", "weight": 1.0 } }, "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": "Goodwill", "verboseLabel": "Acquisitions" } } }, "localname": "GoodwillPurchaseAccountingAdjustments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfChangesInGoodwillDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_GrossProfit": { "auth_ref": [ "r60" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10070.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.", "label": "Gross Profit", "totalLabel": "Gross profit" } } }, "localname": "GrossProfit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments": { "auth_ref": [ "r93" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": 10030.0, "parentTag": "becn_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10030.0, "parentTag": "us-gaap_NetIncomeLoss", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.", "label": "Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments", "totalLabel": "Income (loss) before provision for income taxes" } } }, "localname": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeLossFromEquityMethodInvestments": { "auth_ref": [ "r57", "r83", "r118", "r131", "r296", "r312" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": 10020.0, "parentTag": "us-gaap_NetIncomeLoss", "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 net income of subsidiaries" } } }, "localname": "IncomeLossFromEquityMethodInvestments", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail" ], "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_IncomeTaxExpenseBenefit": { "auth_ref": [ "r89", "r119", "r232" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": 10040.0, "parentTag": "becn_IncomeLossFromContinuingOperationsBeforeIncomeLossFromEquityMethodInvestments", "weight": -1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10040.0, "parentTag": "us-gaap_NetIncomeLoss", "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", "terseLabel": "Provision for (benefit from) income taxes", "verboseLabel": "Provision for (benefit from) income taxes" } } }, "localname": "IncomeTaxExpenseBenefit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncomeTaxesPaidNet": { "auth_ref": [ "r86" ], "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 paid (received), net of refunds" } } }, "localname": "IncomeTaxesPaidNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities": { "auth_ref": [ "r82" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10320.0, "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 vendors for goods and services received and the amount of obligations and expenses incurred but not paid.", "label": "Increase Decrease In Accounts Payable And Accrued Liabilities", "terseLabel": "Accounts payable and accrued expenses" } } }, "localname": "IncreaseDecreaseInAccountsPayableAndAccruedLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInAccountsReceivable": { "auth_ref": [ "r82" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10290.0, "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.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInInventories": { "auth_ref": [ "r82" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10300.0, "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.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Increase Decrease In Operating Capital [Abstract]", "terseLabel": "Changes in operating assets and liabilities, net of the effects of businesses acquired in the period:" } } }, "localname": "IncreaseDecreaseInOperatingCapitalAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_IncreaseDecreaseInOtherOperatingLiabilities": { "auth_ref": [ "r82" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10330.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in operating liabilities classified as other.", "label": "Increase Decrease In Other Operating Liabilities", "terseLabel": "Other liabilities" } } }, "localname": "IncreaseDecreaseInOtherOperatingLiabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets": { "auth_ref": [ "r82" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10310.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of increase (decrease) in prepaid expenses, and assets classified as other.", "label": "Increase Decrease In Prepaid Deferred Expense And Other Assets", "negatedLabel": "Prepaid expenses and other assets" } } }, "localname": "IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis": { "auth_ref": [ "r144", "r151" ], "lang": { "en-US": { "role": { "documentation": "Information by type or class of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.", "label": "Indefinite Lived Intangible Assets By Major Class [Axis]", "terseLabel": "Indefinite-lived Intangible Assets" } } }, "localname": "IndefiniteLivedIntangibleAssetsByMajorClassAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill": { "auth_ref": [ "r151" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail": { "order": 10020.0, "parentTag": "us-gaap_IntangibleAssetsNetExcludingGoodwill", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.", "label": "Indefinite Lived Intangible Assets Excluding Goodwill", "terseLabel": "Indefinite lived trademarks" } } }, "localname": "IndefiniteLivedIntangibleAssetsExcludingGoodwill", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain": { "auth_ref": [ "r144", "r151" ], "lang": { "en-US": { "role": { "documentation": "The major class of indefinite-lived intangible asset (for example, trade names, etc. but not all-inclusive), excluding goodwill. 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 the company.", "label": "Indefinite Lived Intangible Assets Major Class Name [Domain]", "terseLabel": "Indefinite-lived Intangible Assets, Major Class Name" } } }, "localname": "IndefiniteLivedIntangibleAssetsMajorClassNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_IndefinitelivedIntangibleAssetsAcquired": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.", "label": "Indefinitelived Intangible Assets Acquired", "terseLabel": "Indefinite-lived Intangible Assets Acquired" } } }, "localname": "IndefinitelivedIntangibleAssetsAcquired", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_IntangibleAssetsNetExcludingGoodwill": { "auth_ref": [ "r140", "r146" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10230.0, "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", "totalLabel": "Total intangibles, net" } } }, "localname": "IntangibleAssetsNetExcludingGoodwill", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestExpense": { "auth_ref": [ "r56", "r117", "r277", "r280", "r299" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10060.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of the cost of borrowed funds accounted for as interest expense.", "label": "Interest Expense", "terseLabel": "Interest expense, financing costs, and other" } } }, "localname": "InterestExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_InterestPaidNet": { "auth_ref": [ "r77", "r80", "r86" ], "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" } } }, "localname": "InterestPaidNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_InventoryNet": { "auth_ref": [ "r2", "r40", "r133" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10300.0, "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, net" } } }, "localname": "InventoryNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures": { "auth_ref": [ "r25" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10260.0, "parentTag": "us-gaap_Assets", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of investment in equity method investee and investment in and advance to affiliate.", "label": "Investments In Affiliates Subsidiaries Associates And Joint Ventures", "terseLabel": "Investments in consolidated subsidiaries" } } }, "localname": "InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_LettersOfCreditOutstandingAmount": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.", "label": "Letters Of Credit Outstanding Amount", "terseLabel": "Standby letters of credit outstanding" } } }, "localname": "LettersOfCreditOutstandingAmount", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_Liabilities": { "auth_ref": [ "r29" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10010.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.", "label": "Liabilities", "totalLabel": "Total liabilities" } } }, "localname": "Liabilities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquity": { "auth_ref": [ "r21", "r293", "r308" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "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 stockholders' equity" } } }, "localname": "LiabilitiesAndStockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_LiabilitiesAndStockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Liabilities And Stockholders Equity [Abstract]", "terseLabel": "Liabilities and Stockholders' Equity" } } }, "localname": "LiabilitiesAndStockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_LiabilitiesCurrent": { "auth_ref": [ "r31" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10100.0, "parentTag": "us-gaap_Liabilities", "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_LineOfCredit": { "auth_ref": [ "r11", "r292", "r304" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.", "label": "Line Of Credit", "terseLabel": "Long-term line of credit", "totalLabel": "Total Borrowings under revolving lines of credit/term loans" } } }, "localname": "LineOfCredit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025TermLoanAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_LineOfCreditFacilityExpirationDate1": { "auth_ref": [ "r28" ], "lang": { "en-US": { "role": { "documentation": "Date the credit facility terminates, in CCYY-MM-DD format.", "label": "Line Of Credit Facility Expiration Date1", "terseLabel": "Line of Credit Facility, Expiration Date" } } }, "localname": "LineOfCreditFacilityExpirationDate1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "dateItemType" }, "us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd": { "auth_ref": [ "r28" ], "lang": { "en-US": { "role": { "documentation": "The effective interest rate at the end of the reporting period.", "label": "Line Of Credit Facility Interest Rate At Period End", "terseLabel": "Line of Credit Facility, Interest Rate at Period End" } } }, "localname": "LineOfCreditFacilityInterestRateAtPeriodEnd", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "percentItemType" }, "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity": { "auth_ref": [ "r28" ], "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": "Line of Credit Facility, Maximum Borrowing Capacity" } } }, "localname": "LineOfCreditFacilityMaximumBorrowingCapacity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail" ], "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": "Line of credit facility, unused fees" } } }, "localname": "LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "us-gaap_LinesOfCreditCurrent": { "auth_ref": [ "r9", "r291" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail": { "order": 10010.0, "parentTag": "us-gaap_LineOfCredit", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.", "label": "Lines Of Credit Current", "negatedLabel": "Current portion" } } }, "localname": "LinesOfCreditCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_LongTermLineOfCredit": { "auth_ref": [ "r34", "r159", "r160" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail": { "order": 10020.0, "parentTag": "us-gaap_LineOfCredit", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10110.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.", "label": "Long Term Line Of Credit", "terseLabel": "Borrowings under revolving lines of credit, net", "verboseLabel": "Borrowings under revolving lines of credit/term loans, net" } } }, "localname": "LongTermLineOfCredit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongTermNotesAndLoans": { "auth_ref": [ "r34" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10120.0, "parentTag": "us-gaap_Liabilities", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.", "label": "Long Term Notes And Loans", "terseLabel": "Long-term debt, net" } } }, "localname": "LongTermNotesAndLoans", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_LongtermDebtTypeAxis": { "auth_ref": [ "r34" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "stringItemType" }, "us-gaap_LongtermDebtTypeDomain": { "auth_ref": [ "r34", "r161" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsEquipmentFinancingFacilitiesAndOtherAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail" ], "xbrltype": "domainItemType" }, "us-gaap_NetCashProvidedByUsedInFinancingActivities": { "auth_ref": [ "r79" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "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 in) financing activities" } } }, "localname": "NetCashProvidedByUsedInFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInInvestingActivities": { "auth_ref": [ "r79" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "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 provided by (used in) investing activities" } } }, "localname": "NetCashProvidedByUsedInInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NetCashProvidedByUsedInOperatingActivities": { "auth_ref": [ "r79", "r81", "r84" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "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", "terseLabel": "Net cash provided by (used in) operating activities", "totalLabel": "Net cash provided by (used in) operating activities" } } }, "localname": "NetCashProvidedByUsedInOperatingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_NetIncomeLoss": { "auth_ref": [ "r49", "r52", "r58", "r84", "r105", "r297", "r313" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": null, "parentTag": null, "root": true, "weight": null }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome": { "order": 10010.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10010.0, "parentTag": "becn_NetIncomeLossAvailableToCommonStockholders", "weight": 1.0 } }, "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 (loss)", "totalLabel": "Net income (loss)" } } }, "localname": "NetIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "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": "Recent Accounting Pronouncements - Adopted and Not Yet Adopted" } } }, "localname": "NewAccountingPronouncementsPolicyPolicyTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_NoncompeteAgreementsMember": { "auth_ref": [ "r244" ], "lang": { "en-US": { "role": { "documentation": "Agreement in which one party agrees not to pursue a similar trade in competition with another party.", "label": "Noncompete Agreements [Member]", "terseLabel": "Noncompete Agreements [Member]" } } }, "localname": "NoncompeteAgreementsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "domainItemType" }, "us-gaap_NoncurrentAssets": { "auth_ref": [ "r126" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.", "label": "Noncurrent Assets", "terseLabel": "Long-lived assets" } } }, "localname": "NoncurrentAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_NumberOfStatesInWhichEntityOperates": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The number of states the entity operates in as of the balance sheet date.", "label": "Number Of States In Which Entity Operates", "verboseLabel": "Number of states in which entity operates" } } }, "localname": "NumberOfStatesInWhichEntityOperates", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail" ], "xbrltype": "integerItemType" }, "us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent": { "auth_ref": [ "r47", "r55" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome": { "order": 10020.0, "parentTag": "us-gaap_ComprehensiveIncomeNetOfTax", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.", "label": "Oci Before Reclassifications Net Of Tax Attributable To Parent", "terseLabel": "Change in accumulated other comprehensive income (loss)", "totalLabel": "Total other comprehensive income (loss)" } } }, "localname": "OciBeforeReclassificationsNetOfTaxAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingExpenses": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10080.0, "parentTag": "us-gaap_OperatingIncomeLoss", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.", "label": "Operating Expenses", "totalLabel": "Total operating expense" } } }, "localname": "OperatingExpenses", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingExpensesAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Operating Expenses [Abstract]", "terseLabel": "Operating expense:" } } }, "localname": "OperatingExpensesAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "stringItemType" }, "us-gaap_OperatingIncomeLoss": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail": { "order": 10050.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10050.0, "parentTag": "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments", "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": "Income (loss) from operations" } } }, "localname": "OperatingIncomeLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesFutureMinimumPaymentsDue": { "auth_ref": [ "r282", "r284" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail": { "order": null, "parentTag": null, "root": true, "weight": null } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.", "label": "Operating Leases Future Minimum Payments Due", "totalLabel": "Total minimum lease payments" } } }, "localname": "OperatingLeasesFutureMinimumPaymentsDue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears": { "auth_ref": [ "r282", "r284" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail": { "order": 10050.0, "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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": "Operating Leases Future Minimum Payments Due In Five Years", "terseLabel": "2023" } } }, "localname": "OperatingLeasesFutureMinimumPaymentsDueInFiveYears", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears": { "auth_ref": [ "r282", "r284" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail": { "order": 10040.0, "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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": "Operating Leases Future Minimum Payments Due In Four Years", "terseLabel": "2022" } } }, "localname": "OperatingLeasesFutureMinimumPaymentsDueInFourYears", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears": { "auth_ref": [ "r282", "r284" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail": { "order": 10030.0, "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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": "Operating Leases Future Minimum Payments Due In Three Years", "terseLabel": "2021" } } }, "localname": "OperatingLeasesFutureMinimumPaymentsDueInThreeYears", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears": { "auth_ref": [ "r282", "r284" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail": { "order": 10020.0, "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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": "Operating Leases Future Minimum Payments Due In Two Years", "terseLabel": "2020" } } }, "localname": "OperatingLeasesFutureMinimumPaymentsDueInTwoYears", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter": { "auth_ref": [ "r282", "r284" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail": { "order": 10060.0, "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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": "Operating Leases Future Minimum Payments Due Thereafter", "terseLabel": "Thereafter" } } }, "localname": "OperatingLeasesFutureMinimumPaymentsDueThereafter", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail": { "order": 10010.0, "parentTag": "us-gaap_OperatingLeasesFutureMinimumPaymentsDue", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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": "Operating Leases Future Minimum Payments Remainder Of Fiscal Year", "terseLabel": "2019 (July - Sept)" } } }, "localname": "OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYear", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfMinimumRentalCommitmentsUnderNonCancelableOperatingLeasesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_OperatingLeasesRentExpenseNet": { "auth_ref": [ "r283" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.", "label": "Operating Leases Rent Expense Net", "terseLabel": "Operating Leases, Rent Expense, Net, Total" } } }, "localname": "OperatingLeasesRentExpenseNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "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_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock": { "auth_ref": [ "r0", "r258" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.", "label": "Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block]", "terseLabel": "Company Overview" } } }, "localname": "OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverview" ], "xbrltype": "textBlockItemType" }, "us-gaap_OtherAssetsNoncurrent": { "auth_ref": [ "r26" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10240.0, "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, net" } } }, "localname": "OtherAssetsNoncurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax": { "auth_ref": [ "r43", "r45", "r273", "r274", "r275", "r276" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome": { "order": 10030.0, "parentTag": "us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent", "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", "terseLabel": "Foreign currency translation adjustment" } } }, "localname": "OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent": { "auth_ref": [ "r50", "r53", "r250", "r251", "r254" ], "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", "terseLabel": "Other comprehensive income (loss)" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract]", "terseLabel": "Other comprehensive income (loss):" } } }, "localname": "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfComprehensiveIncome" ], "xbrltype": "stringItemType" }, "us-gaap_OtherLiabilitiesNoncurrent": { "auth_ref": [ "r35" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10150.0, "parentTag": "us-gaap_Liabilities", "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsForProceedsFromOtherInvestingActivities": { "auth_ref": [ "r66", "r69", "r94" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10200.0, "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": "Intercompany activity" } } }, "localname": "PaymentsForProceedsFromOtherInvestingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfDebtIssuanceCosts": { "auth_ref": [ "r75" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10060.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10100.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.", "label": "Payments Of Debt Issuance Costs", "negatedLabel": "Payment of debt issuance costs", "terseLabel": "Payments of debt issuance costs" } } }, "localname": "PaymentsOfDebtIssuanceCosts", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock": { "auth_ref": [ "r73" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10100.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "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 to preferred shareholders of the parent entity.", "label": "Payments Of Dividends Preferred Stock And Preference Stock", "negatedLabel": "Payment of dividends on preferred stock" } } }, "localname": "PaymentsOfDividendsPreferredStockAndPreferenceStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsOfStockIssuanceCosts": { "auth_ref": [ "r76" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10090.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10130.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for cost incurred directly with the issuance of an equity security.", "label": "Payments Of Stock Issuance Costs", "negatedLabel": "Payment of stock issuance costs" } } }, "localname": "PaymentsOfStockIssuanceCosts", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation": { "auth_ref": [ "r73", "r187" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10120.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10160.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.", "label": "Payments Related To Tax Withholding For Share Based Compensation", "negatedLabel": "Taxes paid related to net share settlement of equity awards" } } }, "localname": "PaymentsRelatedToTaxWithholdingForShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireBusinessesGross": { "auth_ref": [ "r67", "r246" ], "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": "Acquisition purchase price in cash" } } }, "localname": "PaymentsToAcquireBusinessesGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCompanyOverviewAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired": { "auth_ref": [ "r67" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10180.0, "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": "Acquisition of businesses, net" } } }, "localname": "PaymentsToAcquireBusinessesNetOfCashAcquired", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment": { "auth_ref": [ "r68" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10170.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.", "label": "Payments To Acquire Property Plant And Equipment", "negatedLabel": "Purchases of property and equipment" } } }, "localname": "PaymentsToAcquirePropertyPlantAndEquipment", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PortionAtFairValueFairValueDisclosureMember": { "auth_ref": [ "r264" ], "lang": { "en-US": { "role": { "documentation": "Measured at fair value for financial reporting purposes.", "label": "Portion At Fair Value Fair Value Disclosure [Member]", "terseLabel": "Fair Value Disclosure Item Amounts [Default]" } } }, "localname": "PortionAtFairValueFairValueDisclosureMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFairValueMeasurementAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_PreferredStockDividendRatePercentage": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "The percentage rate used to calculate dividend payments on preferred stock.", "label": "Preferred Stock Dividend Rate Percentage", "terseLabel": "Preferred stock dividend rate" } } }, "localname": "PreferredStockDividendRatePercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "us-gaap_PreferredStockDividendsIncomeStatementImpact": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10020.0, "parentTag": "becn_NetIncomeLossAvailableToCommonStockholders", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.", "label": "Preferred Stock Dividends Income Statement Impact", "terseLabel": "Dividends on preferred shares", "verboseLabel": "Dividends on preferred shares" } } }, "localname": "PreferredStockDividendsIncomeStatementImpact", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_PreferredStockLiquidationPreference": { "auth_ref": [ "r14", "r88", "r90", "r170", "r171" ], "lang": { "en-US": { "role": { "documentation": "The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.", "label": "Preferred Stock Liquidation Preference", "terseLabel": "Preferred stock, liquidation purchase price per share" } } }, "localname": "PreferredStockLiquidationPreference", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_PreferredStockLiquidationPreferenceValue": { "auth_ref": [], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of the difference between preference in liquidation and the par or stated values of the preferred shares.", "label": "Preferred Stock Liquidation Preference Value", "terseLabel": "Preferred stock, liquidation preference value" } } }, "localname": "PreferredStockLiquidationPreferenceValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_PreferredStockMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Preferred shares may provide a preferential dividend to the dividend on common stock and may take precedence over common stock in the event of a liquidation. Preferred shares typically represent an ownership interest in the company.", "label": "Preferred Stock [Member]", "terseLabel": "Preferred Stock [Member]" } } }, "localname": "PreferredStockMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail" ], "xbrltype": "domainItemType" }, "us-gaap_PreferredStockParOrStatedValuePerShare": { "auth_ref": [ "r14" ], "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 value" } } }, "localname": "PreferredStockParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_PreferredStockSharesAuthorized": { "auth_ref": [ "r14" ], "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": "Undesignated Preferred Stock, shares authorized" } } }, "localname": "PreferredStockSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_PreferredStockSharesIssued": { "auth_ref": [ "r14" ], "lang": { "en-US": { "role": { "documentation": "Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.", "label": "Preferred Stock Shares Issued", "terseLabel": "Undesignated Preferred Stock, issued", "verboseLabel": "Preferred stock, issuance" } } }, "localname": "PreferredStockSharesIssued", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_PreferredStockSharesOutstanding": { "auth_ref": [ "r14" ], "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": "Undesignated Preferred Stock, outstanding" } } }, "localname": "PreferredStockSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_PreferredStockValue": { "auth_ref": [ "r14" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10060.0, "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": "Undesignated preferred stock; 5,000,000 shares authorized, none issued or outstanding" } } }, "localname": "PreferredStockValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_PrepaidExpenseAndOtherAssetsCurrent": { "auth_ref": [ "r3", "r22", "r23" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10310.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.", "label": "Prepaid Expense And Other Assets Current", "terseLabel": "Prepaid expenses and other current assets" } } }, "localname": "PrepaidExpenseAndOtherAssetsCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfCommonStock": { "auth_ref": [ "r70" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10110.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10150.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from the additional capital contribution to the entity.", "label": "Proceeds From Issuance Of Common Stock", "terseLabel": "Proceeds from issuance of common stock related to equity awards" } } }, "localname": "ProceedsFromIssuanceOfCommonStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock": { "auth_ref": [ "r70" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.", "label": "Proceeds From Issuance Of Convertible Preferred Stock", "verboseLabel": "Proceeds from convertible preferred stock" } } }, "localname": "ProceedsFromIssuanceOfConvertiblePreferredStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock": { "auth_ref": [ "r70" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10080.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10120.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder.", "label": "Proceeds From Issuance Of Redeemable Convertible Preferred Stock", "terseLabel": "Proceeds from issuance of convertible preferred stock" } } }, "localname": "ProceedsFromIssuanceOfRedeemableConvertiblePreferredStock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt": { "auth_ref": [ "r71" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10050.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10090.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).", "label": "Proceeds From Issuance Of Senior Long Term Debt", "terseLabel": "Borrowings under senior notes" } } }, "localname": "ProceedsFromIssuanceOfSeniorLongTermDebt", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromLinesOfCredit": { "auth_ref": [ "r71", "r92" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.", "label": "Proceeds From Lines Of Credit", "terseLabel": "Proceeds from Lines of Credit" } } }, "localname": "ProceedsFromLinesOfCredit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromLongTermLinesOfCredit": { "auth_ref": [ "r71" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10010.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10050.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow 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 maturities due beyond one year or the operating cycle, if longer.", "label": "Proceeds From Long Term Lines Of Credit", "terseLabel": "Borrowings under revolving lines of credit" } } }, "localname": "ProceedsFromLongTermLinesOfCredit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromPaymentsForOtherFinancingActivities": { "auth_ref": [ "r72", "r76", "r94" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10130.0, "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": "Intercompany activity" } } }, "localname": "ProceedsFromPaymentsForOtherFinancingActivities", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProceedsFromSaleOfProductiveAssets": { "auth_ref": [ "r65" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10190.0, "parentTag": "us-gaap_NetCashProvidedByUsedInInvestingActivities", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.", "label": "Proceeds From Sale Of Productive Assets", "terseLabel": "Proceeds from the sale of assets" } } }, "localname": "ProceedsFromSaleOfProductiveAssets", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ProfitLoss": { "auth_ref": [ "r49", "r52", "r78", "r120", "r124", "r250", "r252", "r253", "r256", "r257" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10210.0, "parentTag": "us-gaap_NetCashProvidedByUsedInOperatingActivities", "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": "Net income (loss)" } } }, "localname": "ProfitLoss", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_PropertyPlantAndEquipmentNet": { "auth_ref": [ "r7", "r8", "r155", "r309" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10210.0, "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 and equipment, net" } } }, "localname": "PropertyPlantAndEquipmentNet", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent": { "auth_ref": [ "r47", "r55" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.", "label": "Reclassification From Aoci Current Period Net Of Tax Attributable To Parent", "terseLabel": "Reclassifications out of other comprehensive income (loss)" } } }, "localname": "ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_RepaymentsOfLongTermLinesOfCredit": { "auth_ref": [ "r74" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail": { "order": 10020.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 }, "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10060.0, "parentTag": "us-gaap_NetCashProvidedByUsedInFinancingActivities", "weight": -1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The cash outflow for the settlement of obligation drawn 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 maturities due beyond one year or the operating cycle, if longer.", "label": "Repayments Of Long Term Lines Of Credit", "negatedLabel": "Repayments under revolving lines of credit" } } }, "localname": "RepaymentsOfLongTermLinesOfCredit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestrictedCashCurrent": { "auth_ref": [ "r1", "r6", "r87" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10320.0, "parentTag": "us-gaap_AssetsCurrent", "weight": 1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of cash restricted as to withdrawal or usage, classified as current. 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.", "label": "Restricted Cash Current", "terseLabel": "Restricted cash" } } }, "localname": "RestrictedCashCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_RestrictedStockUnitsRSUMember": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.", "label": "Restricted Stock Units R S U [Member]", "terseLabel": "Restricted Stock Units (RSUs) [Member]", "verboseLabel": "Restricted Stock Units [Member]" } } }, "localname": "RestrictedStockUnitsRSUMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "domainItemType" }, "us-gaap_RetainedEarningsAccumulatedDeficit": { "auth_ref": [ "r18", "r175", "r307" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10080.0, "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" } } }, "localname": "RetainedEarningsAccumulatedDeficit", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "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": [ "r177", "r178", "r179" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10130.0, "parentTag": "us-gaap_GrossProfit", "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" } } }, "localname": "RevenueFromContractWithCustomerExcludingAssessedTax", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesByProductLineAndGeographyDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_RevenueFromContractWithCustomerTextBlock": { "auth_ref": [ "r95", "r183" ], "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": "Net Sales" } } }, "localname": "RevenueFromContractWithCustomerTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetSales" ], "xbrltype": "textBlockItemType" }, "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 Lines of Credit [Member]" } } }, "localname": "RevolvingCreditFacilityMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2020ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023ABLAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingRSGAcquisitionAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsParentheticalDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail" ], "xbrltype": "domainItemType" }, "us-gaap_SaleOfStockNameOfTransactionDomain": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Sale of the entity's stock, including, but not limited to, initial public offering (IPO) and private placement.", "label": "Sale Of Stock Name Of Transaction [Domain]", "terseLabel": "Sale of Stock" } } }, "localname": "SaleOfStockNameOfTransactionDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable": { "auth_ref": [ "r104" ], "lang": { "en-US": { "role": { "documentation": "Schedule for securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.", "label": "Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table]", "terseLabel": "Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table]" } } }, "localname": "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock": { "auth_ref": [ "r104" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.", "label": "Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block]", "terseLabel": "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share" } } }, "localname": "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable": { "auth_ref": [ "r237", "r238" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfDebtInstrumentsTextBlock": { "auth_ref": [ "r34", "r91", "r170", "r172", "r173", "r174", "r278", "r279", "r281", "r303" ], "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 Long-term Debt Instruments" } } }, "localname": "ScheduleOfDebtInstrumentsTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock": { "auth_ref": [ "r105" ], "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": "Components and Calculation of Basic and Diluted Net Income (Loss) Per Share" } } }, "localname": "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable": { "auth_ref": [ "r142", "r147" ], "lang": { "en-US": { "role": { "documentation": "Schedule of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.", "label": "Schedule Of Finite Lived Intangible Assets [Table]", "terseLabel": "Schedule Of Finite Lived Intangible Assets [Table]" } } }, "localname": "ScheduleOfFiniteLivedIntangibleAssetsTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock": { "auth_ref": [ "r285" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.", "label": "Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block]", "terseLabel": "Schedule of Minimum Rental Commitments under Non-cancelable Operating Leases" } } }, "localname": "ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureCommitmentsAndContingenciesTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfGoodwillTextBlock": { "auth_ref": [ "r138", "r139" ], "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": "Summary of Changes in goodwill" } } }, "localname": "ScheduleOfGoodwillTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock": { "auth_ref": [ "r241" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree.", "label": "Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed Table [Text Block]", "terseLabel": "Schedule of Recognized Identified Assets Acquired and Liabilities Assumed" } } }, "localname": "ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable": { "auth_ref": [ "r115", "r120", "r121", "r122", "r138" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock": { "auth_ref": [ "r115", "r120", "r121", "r122", "r138" ], "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": "Schedule of Geographic Information" } } }, "localname": "ScheduleOfSegmentReportingInformationBySegmentTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable": { "auth_ref": [ "r192", "r222" ], "lang": { "en-US": { "role": { "documentation": "Components of an equity-based arrangement under which compensation is awarded to employees, typically comprised of compensation expense; changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan; and cash flow effects resulting from the equity-based payment arrangement. Component disclosures are by type of award and plan name.", "label": "Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]", "terseLabel": "Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table]" } } }, "localname": "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock": { "auth_ref": [ "r198", "r209", "r212" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.", "label": "Schedule Of Share Based Compensation Stock Options Activity Table [Text Block]", "terseLabel": "Stock Options Outstanding and Activity During the Period" } } }, "localname": "ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock": { "auth_ref": [ "r215" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.", "label": "Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block]", "terseLabel": "Fair Value of Stock Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions" } } }, "localname": "ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.", "label": "Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table [Text Block]", "terseLabel": "Restricted Shares and Units Outstanding and Activity During the Period" } } }, "localname": "ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationTables" ], "xbrltype": "textBlockItemType" }, "us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock": { "auth_ref": [ "r147" ], "lang": { "en-US": { "role": { "documentation": "Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.", "label": "Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block]", "terseLabel": "Summary of Estimated Future Amortization" } } }, "localname": "ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsTables" ], "xbrltype": "textBlockItemType" }, "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": [ "r128" ], "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": "Geographic Data" } } }, "localname": "SegmentReportingDisclosureTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicData" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGeographicDataScheduleOfGeographicInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_SellingGeneralAndAdministrativeExpense": { "auth_ref": [ "r62", "r132" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations": { "order": 10100.0, "parentTag": "us-gaap_OperatingExpenses", "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.", "label": "Selling General And Administrative Expense", "terseLabel": "Selling, general and administrative" } } }, "localname": "SellingGeneralAndAdministrativeExpense", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "monetaryItemType" }, "us-gaap_SeniorLongTermNotes": { "auth_ref": [ "r34" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.", "label": "Senior Long Term Notes", "terseLabel": "Long-term borrowings under senior notes" } } }, "localname": "SeniorLongTermNotes", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_SeniorNotes": { "auth_ref": [ "r294", "r311" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.", "label": "Senior Notes", "terseLabel": "Senior Notes", "verboseLabel": "Senior Notes Payable" } } }, "localname": "SeniorNotes", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2023SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2025SeniorNotesAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_SeniorNotesCurrent": { "auth_ref": [ "r30" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying value as of the balance sheet date of the portion of long-term notes having the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment.", "label": "Senior Notes Current", "negatedLabel": "Current portion" } } }, "localname": "SeniorNotesCurrent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsLongTermDebtInstrumentsDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember": { "auth_ref": [ "r238" ], "lang": { "en-US": { "role": { "documentation": "Represents the aggregation and reporting of combined amounts of individually immaterial business combinations that were completed during the period.", "label": "Series Of Individually Immaterial Business Acquisitions [Member]", "terseLabel": "Series of Individually Immaterial Business Acquisitions [Member]" } } }, "localname": "SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_ShareBasedCompensation": { "auth_ref": [ "r82" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows": { "order": 10230.0, "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": "Stock-based compensation" } } }, "localname": "ShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1": { "auth_ref": [ "r193" ], "lang": { "en-US": { "role": { "documentation": "Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1", "terseLabel": "Vesting period" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "durationItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod": { "auth_ref": [ "r203" ], "lang": { "en-US": { "role": { "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period", "negatedLabel": "Canceled/Forfeited" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue": { "auth_ref": [ "r208" ], "lang": { "en-US": { "role": { "documentation": "Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value", "terseLabel": "Canceled/Forfeited" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod": { "auth_ref": [ "r206" ], "lang": { "en-US": { "role": { "documentation": "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period", "terseLabel": "Granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue": { "auth_ref": [ "r206" ], "lang": { "en-US": { "role": { "documentation": "The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value", "terseLabel": "Granted", "verboseLabel": "Weighted-average fair value of RSUs granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationScheduleOfRestrictedStockUnitsAdditionalInformationDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber": { "auth_ref": [ "r205" ], "lang": { "en-US": { "role": { "documentation": "The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number", "periodEndLabel": "Balance as of June 30, 2019", "periodStartLabel": "Balance as of September 30, 2018" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward": { "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": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward", "terseLabel": "Outstanding" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue": { "auth_ref": [ "r205" ], "lang": { "en-US": { "role": { "documentation": "The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value", "periodEndLabel": "Balance as of June 30, 2019", "periodStartLabel": "Balance as of September 30, 2018" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward": { "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": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Roll Forward", "terseLabel": "Weighted - Average Grant Date Fair Value" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod": { "auth_ref": [ "r207" ], "lang": { "en-US": { "role": { "documentation": "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period", "negatedLabel": "Released" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue": { "auth_ref": [ "r211" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value", "terseLabel": "Total grant date fair value of RSUs vested" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationScheduleOfRestrictedStockUnitsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue": { "auth_ref": [ "r207" ], "lang": { "en-US": { "role": { "documentation": "The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value", "terseLabel": "Released" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate": { "auth_ref": [ "r218" ], "lang": { "en-US": { "role": { "documentation": "The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate", "verboseLabel": "Dividend yield" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationFairValueOfStockOptionsBlackScholesOptionPricingModelWeightedAverageAssumptionsDetail" ], "xbrltype": "percentItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate": { "auth_ref": [ "r219" ], "lang": { "en-US": { "role": { "documentation": "The risk-free interest rate assumption that is used in valuing an option on its own shares.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate", "terseLabel": "Risk-free interest rate" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationFairValueOfStockOptionsBlackScholesOptionPricingModelWeightedAverageAssumptionsDetail" ], "xbrltype": "percentItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate": { "auth_ref": [ "r217" ], "lang": { "en-US": { "role": { "documentation": "Weighted average expected volatility rate of share-based compensation awards.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate", "terseLabel": "Expected volatility" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationFairValueOfStockOptionsBlackScholesOptionPricingModelWeightedAverageAssumptionsDetail" ], "xbrltype": "percentItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems": { "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": "Share Based Compensation Arrangement By Share Based Payment Award [Line Items]", "terseLabel": "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized": { "auth_ref": [ "r195" ], "lang": { "en-US": { "role": { "documentation": "The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).", "label": "Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized", "terseLabel": "Stock-based compensation number of shares authorized" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant": { "auth_ref": [ "r222" ], "lang": { "en-US": { "role": { "documentation": "The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant", "terseLabel": "Stock-based compensation number of shares available for awards" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber": { "auth_ref": [ "r201" ], "lang": { "en-US": { "role": { "documentation": "The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number", "terseLabel": "Exercisable as of June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice": { "auth_ref": [ "r201" ], "lang": { "en-US": { "role": { "documentation": "The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price", "terseLabel": "Exercisable as of June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue": { "auth_ref": [ "r211" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value", "terseLabel": "Total intrinsic value of stock options exercised" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionGrantsVestingAndExercisesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod": { "auth_ref": [ "r204" ], "lang": { "en-US": { "role": { "documentation": "Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period", "negatedLabel": "Expired" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod": { "auth_ref": [ "r203" ], "lang": { "en-US": { "role": { "documentation": "The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period", "negatedLabel": "Canceled/Forfeited" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Gross number of share options (or share units) granted during the period.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross", "terseLabel": "Granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue": { "auth_ref": [ "r210" ], "lang": { "en-US": { "role": { "documentation": "The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value", "terseLabel": "Weighted-average fair value of stock options granted" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionGrantsVestingAndExercisesDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue": { "auth_ref": [ "r222" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value", "terseLabel": "Balance" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber": { "auth_ref": [ "r200", "r222" ], "lang": { "en-US": { "role": { "documentation": "Number of options outstanding, including both vested and non-vested options.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number", "periodEndLabel": "Balance as of June 30, 2019", "periodStartLabel": "Balance as of September 30, 2018" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward": { "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": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward", "terseLabel": "Options Outstanding" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice": { "auth_ref": [ "r199" ], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price", "periodEndLabel": "Ending Balance", "periodStartLabel": "Beginning Balance" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Rollforward", "terseLabel": "Weighted-Average Exercise Price" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "stringItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue": { "auth_ref": [ "r214" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value", "terseLabel": "Exercisable as of June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue": { "auth_ref": [ "r212" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value", "terseLabel": "Vested and expected to vest after June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber": { "auth_ref": [ "r213" ], "lang": { "en-US": { "role": { "documentation": "Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number", "terseLabel": "Vested and expected to vest after June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice": { "auth_ref": [ "r213" ], "lang": { "en-US": { "role": { "documentation": "Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price", "terseLabel": "Vested and expected to vest after June 30, 2019" } } }, "localname": "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain": { "auth_ref": [ "r189", "r196" ], "lang": { "en-US": { "role": { "documentation": "Equity-based compensation award.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain]", "terseLabel": "Equity Award" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationRestrictedSharesAndUnitsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "domainItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which option holders acquired shares when converting their stock options into shares.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price", "terseLabel": "Exercised" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price", "terseLabel": "Expired" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price", "terseLabel": "Canceled/Forfeited" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.", "label": "Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price", "terseLabel": "Granted" } } }, "localname": "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "perShareItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage": { "auth_ref": [ "r193" ], "lang": { "en-US": { "role": { "documentation": "Percentage of vesting of share-based compensation awards.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage", "terseLabel": "Percentage of shares that will vest" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "percentItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested": { "auth_ref": [], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Vested", "terseLabel": "Total intrinsic value of RSUs released" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationScheduleOfRestrictedStockUnitsAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod": { "auth_ref": [ "r194" ], "lang": { "en-US": { "role": { "documentation": "Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period", "terseLabel": "Non-qualified options granted expiration period" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetail" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1": { "auth_ref": [ "r216", "r223" ], "lang": { "en-US": { "role": { "documentation": "Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1", "terseLabel": "Expected life (in years)" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationFairValueOfStockOptionsBlackScholesOptionPricingModelWeightedAverageAssumptionsDetail" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1": { "auth_ref": [ "r222" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1", "terseLabel": "Exercisable as of June 30, 2019" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2": { "auth_ref": [ "r213" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2", "terseLabel": "Balance" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1": { "auth_ref": [ "r213" ], "lang": { "en-US": { "role": { "documentation": "Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1", "terseLabel": "Vested and expected to vest after June 30, 2019" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "durationItemType" }, "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1": { "auth_ref": [ "r197" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.", "label": "Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1", "terseLabel": "Total grant date fair value of stock options vested" } } }, "localname": "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionGrantsVestingAndExercisesDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_SharesOutstanding": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Number of shares issued which are neither cancelled nor held in the treasury.", "label": "Shares Outstanding", "periodEndLabel": "Balance (in shares)", "periodStartLabel": "Balance (in shares)" } } }, "localname": "SharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "sharesItemType" }, "us-gaap_SignificantAccountingPoliciesTextBlock": { "auth_ref": [ "r95" ], "lang": { "en-US": { "role": { "documentation": "The entire disclosure for all significant accounting policies of the reporting entity.", "label": "Significant Accounting Policies [Text Block]", "terseLabel": "Summary of Significant Accounting Policies" } } }, "localname": "SignificantAccountingPoliciesTextBlock", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies" ], "xbrltype": "textBlockItemType" }, "us-gaap_StatementClassOfStockAxis": { "auth_ref": [ "r13", "r14", "r15", "r169" ], "lang": { "en-US": { "role": { "documentation": "Information by the different classes of stock of the entity.", "label": "Statement Class Of Stock [Axis]", "terseLabel": "Class of Stock" } } }, "localname": "StatementClassOfStockAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_StatementEquityComponentsAxis": { "auth_ref": [ "r38", "r169" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfCashFlowsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfComprehensiveIncomeDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingStatementsOfOperationsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "stringItemType" }, "us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation": { "auth_ref": [ "r14", "r15", "r169", "r175" ], "lang": { "en-US": { "role": { "documentation": "Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.", "label": "Stock Issued During Period Shares Share Based Compensation", "terseLabel": "Issuance of common stock, net of shares withheld for taxes (Shares)" } } }, "localname": "StockIssuedDuringPeriodSharesShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised": { "auth_ref": [ "r14", "r15", "r169", "r175", "r202" ], "lang": { "en-US": { "role": { "documentation": "Number of share options (or share units) exercised during the current period.", "label": "Stock Issued During Period Shares Stock Options Exercised", "negatedLabel": "Exercised" } } }, "localname": "StockIssuedDuringPeriodSharesStockOptionsExercised", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingAndActivityDuringPeriodDetail" ], "xbrltype": "sharesItemType" }, "us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation": { "auth_ref": [ "r14", "r15", "r175", "r191", "r210" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.", "label": "Stock Issued During Period Value Share Based Compensation", "terseLabel": "Issuance of common stock, net of shares withheld for taxes" } } }, "localname": "StockIssuedDuringPeriodValueShareBasedCompensation", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquity": { "auth_ref": [ "r15", "r19", "r20", "r130" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10040.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "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": "Balance", "periodStartLabel": "Balance", "terseLabel": "Total stockholders' equity", "totalLabel": "Total stockholders' equity" } } }, "localname": "StockholdersEquity", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfStockholdersEquity" ], "xbrltype": "monetaryItemType" }, "us-gaap_StockholdersEquityAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Stockholders Equity [Abstract]", "terseLabel": "Stockholders' equity:" } } }, "localname": "StockholdersEquityAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "stringItemType" }, "us-gaap_SubsidiarySaleOfStockAxis": { "auth_ref": [], "lang": { "en-US": { "role": { "documentation": "Information by type of sale of the entity's stock.", "label": "Subsidiary Sale Of Stock [Axis]", "terseLabel": "Sale of Stock" } } }, "localname": "SubsidiarySaleOfStockAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_SupplementalCashFlowInformationAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Supplemental Cash Flow Information [Abstract]", "terseLabel": "Cash paid during the period for:" } } }, "localname": "SupplementalCashFlowInformationAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfCashFlows" ], "xbrltype": "stringItemType" }, "us-gaap_TemporaryEquityCarryingAmountAttributableToParent": { "auth_ref": [], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets": { "order": 10030.0, "parentTag": "us-gaap_LiabilitiesAndStockholdersEquity", "weight": 1.0 } }, "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Carrying Amount Attributable To Parent", "positiveLabel": "Mezzanine equity", "terseLabel": "Convertible preferred stock; $0.01 par value; aggregate liquidation preference $400,000; 400,000 shares authorized, issued and outstanding as of June 30, 2019, September 30, 2018 and June 30, 2018", "verboseLabel": "Convertible preferred stock" } } }, "localname": "TemporaryEquityCarryingAmountAttributableToParent", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSupplementalGuarantorInformationCondensedConsolidatingBalanceSheetsDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheets" ], "xbrltype": "monetaryItemType" }, "us-gaap_TemporaryEquityLiquidationPreference": { "auth_ref": [ "r37" ], "crdr": "credit", "lang": { "en-US": { "role": { "documentation": "The aggregate liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Liquidation Preference", "terseLabel": "Convertible preferred stock. aggregate liquidation preference" } } }, "localname": "TemporaryEquityLiquidationPreference", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "monetaryItemType" }, "us-gaap_TemporaryEquityParOrStatedValuePerShare": { "auth_ref": [ "r5", "r168" ], "lang": { "en-US": { "role": { "documentation": "Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.", "label": "Temporary Equity Par Or Stated Value Per Share", "terseLabel": "Convertible preferred stock, par value" } } }, "localname": "TemporaryEquityParOrStatedValuePerShare", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "perShareItemType" }, "us-gaap_TemporaryEquitySharesAuthorized": { "auth_ref": [ "r12" ], "lang": { "en-US": { "role": { "documentation": "The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Shares Authorized", "terseLabel": "Convertible preferred stock, shares authorized" } } }, "localname": "TemporaryEquitySharesAuthorized", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_TemporaryEquitySharesIssued": { "auth_ref": [ "r12" ], "lang": { "en-US": { "role": { "documentation": "The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Shares Issued", "terseLabel": "Convertible preferred stock, shares issued" } } }, "localname": "TemporaryEquitySharesIssued", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_TemporaryEquitySharesOutstanding": { "auth_ref": [ "r12" ], "lang": { "en-US": { "role": { "documentation": "The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.", "label": "Temporary Equity Shares Outstanding", "terseLabel": "Convertible preferred stock, shares outstanding" } } }, "localname": "TemporaryEquitySharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedBalanceSheetsParenthetical" ], "xbrltype": "sharesItemType" }, "us-gaap_TrademarksMember": { "auth_ref": [ "r243" ], "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.", "label": "Trademarks [Member]", "terseLabel": "Trademarks [Member]" } } }, "localname": "TrademarksMember", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureGoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsDetail" ], "xbrltype": "domainItemType" }, "us-gaap_TypeOfArrangementAxis": { "auth_ref": [ "r249" ], "lang": { "en-US": { "role": { "documentation": "Information by category of arrangement, including but not limited to collaborative arrangements and non-collaborative arrangements.", "label": "Type Of Arrangement [Axis]", "terseLabel": "Type of Arrangement and Non-arrangement Transactions" } } }, "localname": "TypeOfArrangementAxis", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangementsFinancingAlliedAcquisitionAdditionalInformationDetail" ], "xbrltype": "stringItemType" }, "us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic": { "auth_ref": [ "r100" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail": { "order": 10040.0, "parentTag": "becn_NetIncomeLossAvailableToCommonStockholdersBasicAndDiluted", "weight": -1.0 } }, "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.", "label": "Undistributed Earnings Loss Allocated To Participating Securities Basic", "negatedLabel": "Undistributed income allocated to participating securities" } } }, "localname": "UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail" ], "xbrltype": "monetaryItemType" }, "us-gaap_UseOfEstimates": { "auth_ref": [ "r108", "r109", "r110", "r111", "r112", "r113", "r114" ], "lang": { "en-US": { "role": { "documentation": "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.", "label": "Use Of Estimates", "terseLabel": "Use of Estimates" } } }, "localname": "UseOfEstimates", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" ], "xbrltype": "textBlockItemType" }, "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "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.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureAcquisitionsAdditionalInformationDetail" ], "xbrltype": "domainItemType" }, "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding": { "auth_ref": [ "r98", "r103" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail": { "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", "totalLabel": "Weighted-average common shares outstanding - diluted" } } }, "localname": "WeightedAverageNumberOfDilutedSharesOutstanding", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "sharesItemType" }, "us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract": { "auth_ref": [], "lang": { "en-US": { "role": { "label": "Weighted Average Number Of Shares Outstanding [Abstract]", "terseLabel": "Weighted-average common stock outstanding:" } } }, "localname": "WeightedAverageNumberOfSharesOutstandingAbstract", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "stringItemType" }, "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic": { "auth_ref": [ "r97", "r103" ], "calculation": { "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail": { "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", "verboseLabel": "Weighted-average common shares outstanding - basic" } } }, "localname": "WeightedAverageNumberOfSharesOutstandingBasic", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureNetIncomeLossPerShareComponentsAndCalculationOfBasicAndDilutedNetIncomeLossPerShareDetail", "http://www.beaconroofingsupply.com/20190630/taxonomy/role/StatementConsolidatedStatementsOfOperations" ], "xbrltype": "sharesItemType" }, "us-gaap_WriteOffOfDeferredDebtIssuanceCost": { "auth_ref": [ "r63" ], "crdr": "debit", "lang": { "en-US": { "role": { "documentation": "Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.", "label": "Write Off Of Deferred Debt Issuance Cost", "terseLabel": "Write off of debt issuance costs" } } }, "localname": "WriteOffOfDeferredDebtIssuanceCost", "nsuri": "http://fasb.org/us-gaap/2018-01-31", "presentation": [ "http://www.beaconroofingsupply.com/20190630/taxonomy/role/DisclosureFinancingArrangements2022TermLoanAdditionalInformationDetail" ], "xbrltype": "monetaryItemType" } }, "unitCount": 9 } }, "std_ref": { "r0": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "205", "URI": "http://asc.fasb.org/topic&trid=2122149" }, "r1": { "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" }, "r10": { "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" }, "r100": { "Name": "Accounting Standards Codification", "Paragraph": "60B", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "260", "URI": "http://asc.fasb.org/extlink&oid=109260490&loc=SL5780133-109256" }, "r101": { "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" }, "r102": { "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" }, "r103": { "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" }, "r104": { "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" }, "r105": { "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" }, "r106": { "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" }, "r107": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "260", "URI": "http://asc.fasb.org/topic&trid=2144383" }, "r108": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r109": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592" }, "r11": { "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" }, "r110": { "Name": "Accounting Standards Codification", "Paragraph": "11", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592" }, "r111": { "Name": "Accounting Standards Codification", "Paragraph": "12", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592" }, "r112": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592" }, "r113": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592" }, "r114": { "Name": "Accounting Standards Codification", "Paragraph": "9", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "275", "URI": "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592" }, "r115": { "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" }, "r116": { "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" }, "r117": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599" }, "r118": { "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" }, "r119": { "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" }, "r12": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(27)(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r120": { "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" }, "r121": { "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" }, "r122": { "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" }, "r123": { "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" }, "r124": { "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" }, "r125": { "Name": "Accounting Standards Codification", "Paragraph": "40", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599" }, "r126": { "Name": "Accounting Standards Codification", "Paragraph": "41", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "280", "URI": "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599" }, "r127": { "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" }, "r128": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "280", "URI": "http://asc.fasb.org/topic&trid=2134510" }, "r129": { "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" }, "r13": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(27))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r130": { "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" }, "r131": { "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" }, "r132": { "Name": "Accounting Standards Codification", "Paragraph": "8", "Publisher": "FASB", "Section": "30", "SubTopic": "10", "Topic": "330", "URI": "http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311" }, "r133": { "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" }, "r134": { "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" }, "r135": { "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" }, "r136": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(f)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267" }, "r137": { "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" }, "r138": { "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" }, "r139": { "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" }, "r14": { "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" }, "r140": { "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" }, "r141": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "30", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274" }, "r142": { "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" }, "r143": { "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" }, "r144": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275" }, "r145": { "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" }, "r146": { "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" }, "r147": { "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" }, "r148": { "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" }, "r149": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(2)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r15": { "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" }, "r150": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(a)(3)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r151": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(b)", "Topic": "350", "URI": "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275" }, "r152": { "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" }, "r153": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "350", "URI": "http://asc.fasb.org/topic&trid=2144416" }, "r154": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "360", "URI": "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229" }, "r155": { "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" }, "r156": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "440", "URI": "http://asc.fasb.org/topic&trid=2144648" }, "r157": { "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" }, "r158": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "450", "URI": "http://asc.fasb.org/topic&trid=2127136" }, "r159": { "Name": "Accounting Standards Codification", "Paragraph": "13", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600" }, "r16": { "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" }, "r160": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600" }, "r161": { "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" }, "r162": { "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" }, "r163": { "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" }, "r164": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(b)(2)", "Topic": "470", "URI": "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870" }, "r165": { "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" }, "r166": { "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" }, "r167": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "470", "URI": "http://asc.fasb.org/topic&trid=2208564" }, "r168": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Topic": "480", "URI": "http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764" }, "r169": { "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" }, "r17": { "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" }, "r170": { "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" }, "r171": { "Name": "Accounting Standards Codification", "Paragraph": "4", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "505", "URI": "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644" }, "r172": { "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" }, "r173": { "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" }, "r174": { "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" }, "r175": { "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" }, "r176": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "SubTopic": "50", "Topic": "505", "URI": "http://asc.fasb.org/subtopic&trid=2208855" }, "r177": { "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" }, "r178": { "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" }, "r179": { "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" }, "r18": { "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" }, "r180": { "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" }, "r181": { "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" }, "r182": { "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" }, "r183": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "606", "URI": "http://asc.fasb.org/topic&trid=49130388" }, "r184": { "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" }, "r185": { "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" }, "r186": { "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" }, "r187": { "Name": "Accounting Standards Codification", "Paragraph": "19A", "Publisher": "FASB", "Section": "25", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897" }, "r188": { "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" }, "r189": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901" }, "r19": { "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" }, "r190": { "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" }, "r191": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901" }, "r192": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901" }, "r193": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r194": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r195": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)(3)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r196": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a),(g)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r197": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r198": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r199": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r2": { "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" }, "r20": { "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" }, "r200": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(i)-(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r201": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r202": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r203": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(3)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r204": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(1)(iv)(4)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r205": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(i)-(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r206": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r207": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r208": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(c)(2)(iii)(3)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r209": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r21": { "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" }, "r210": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r211": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(d)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r212": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r213": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)(1)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r214": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r215": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r216": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r217": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(ii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r218": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(iii)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r219": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(f)(2)(iv)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r22": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02(7))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r220": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)(1)(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r221": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(i)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r222": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901" }, "r223": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 14.D.2)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809" }, "r224": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SAB Topic 14.F)", "Topic": "718", "URI": "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809" }, "r225": { "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" }, "r226": { "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" }, "r227": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "718", "URI": "http://asc.fasb.org/topic&trid=2228938" }, "r228": { "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" }, "r229": { "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" }, "r23": { "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" }, "r230": { "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" }, "r231": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "740", "URI": "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319" }, "r232": { "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" }, "r233": { "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" }, "r234": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463" }, "r235": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)(2)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463" }, "r236": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(h)(3)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463" }, "r237": { "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" }, "r238": { "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" }, "r239": { "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" }, "r24": { "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" }, "r240": { "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" }, "r241": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472" }, "r242": { "Name": "Accounting Standards Codification", "Paragraph": "4A", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(c)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=84161108&loc=SL65897772-128472" }, "r243": { "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" }, "r244": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "55", "SubTopic": "20", "Subparagraph": "(e)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5263-128473" }, "r245": { "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" }, "r246": { "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" }, "r247": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "30", "Subparagraph": "(d)", "Topic": "805", "URI": "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479" }, "r248": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "805", "URI": "http://asc.fasb.org/topic&trid=2303972" }, "r249": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "808", "URI": "http://asc.fasb.org/extlink&oid=6931272&loc=SL5834143-161434" }, "r25": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.12)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r250": { "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" }, "r251": { "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" }, "r252": { "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" }, "r253": { "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" }, "r254": { "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" }, "r255": { "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" }, "r256": { "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" }, "r257": { "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" }, "r258": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "810", "URI": "http://asc.fasb.org/topic&trid=2197479" }, "r259": { "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" }, "r26": { "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" }, "r260": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(b)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258" }, "r261": { "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" }, "r262": { "Name": "Accounting Standards Codification", "Paragraph": "6A", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "820", "URI": "http://asc.fasb.org/extlink&oid=99377789&loc=SL6742756-110258" }, "r263": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "820", "URI": "http://asc.fasb.org/topic&trid=2155941" }, "r264": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610" }, "r265": { "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" }, "r266": { "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" }, "r267": { "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" }, "r268": { "Name": "Accounting Standards Codification", "Paragraph": "20", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611" }, "r269": { "Name": "Accounting Standards Codification", "Paragraph": "21", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611" }, "r27": { "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" }, "r270": { "Name": "Accounting Standards Codification", "Paragraph": "22", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13572-108611" }, "r271": { "Name": "Accounting Standards Codification", "Paragraph": "23", "Publisher": "FASB", "Section": "50", "SubTopic": "10", "Topic": "825", "URI": "http://asc.fasb.org/extlink&oid=109250915&loc=d3e13587-108611" }, "r272": { "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" }, "r273": { "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" }, "r274": { "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" }, "r275": { "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" }, "r276": { "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" }, "r277": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "835", "URI": "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391" }, "r278": { "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" }, "r279": { "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" }, "r28": { "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" }, "r280": { "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" }, "r281": { "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" }, "r282": { "Name": "Accounting Standards Codification", "Paragraph": "40", "Publisher": "FASB", "Section": "55", "SubTopic": "10", "Subparagraph": "(Note 3)", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697" }, "r283": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717" }, "r284": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(a)", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717" }, "r285": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Topic": "840", "URI": "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717" }, "r286": { "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" }, "r287": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r288": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "20", "Subparagraph": "(bb)(2)", "Topic": "860", "URI": "http://asc.fasb.org/extlink&oid=109247956&loc=d3e107207-111719" }, "r289": { "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" }, "r29": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.19-26)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r290": { "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" }, "r291": { "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" }, "r292": { "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" }, "r293": { "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" }, "r294": { "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" }, "r295": { "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" }, "r296": { "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" }, "r297": { "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" }, "r298": { "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" }, "r299": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "220", "Subparagraph": "(SX 210.9-04.9)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260" }, "r3": { "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" }, "r30": { "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" }, "r300": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "45", "SubTopic": "405", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817" }, "r301": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Subparagraph": "(c)", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823" }, "r302": { "Name": "Accounting Standards Codification", "Paragraph": "3", "Publisher": "FASB", "Section": "50", "SubTopic": "470", "Subparagraph": "e", "Topic": "942", "URI": "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823" }, "r303": { "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" }, "r304": { "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" }, "r305": { "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" }, "r306": { "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" }, "r307": { "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" }, "r308": { "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" }, "r309": { "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" }, "r31": { "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" }, "r310": { "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" }, "r311": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "210", "Subparagraph": "(SX 210.7-03.16(a))", "Topic": "944", "URI": "http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910" }, "r312": { "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" }, "r313": { "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" }, "r314": { "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" }, "r315": { "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" }, "r316": { "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" }, "r317": { "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" }, "r318": { "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" }, "r319": { "Name": "Regulation 12B", "Number": "240", "Publisher": "SEC", "Section": "12", "Subsection": "b-2" }, "r32": { "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" }, "r320": { "Footnote": "2", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "28" }, "r321": { "Footnote": "4", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "28" }, "r322": { "Footnote": "4", "Name": "Regulation S-X (SX)", "Number": "210", "Publisher": "SEC", "Section": "12", "Subsection": "29" }, "r323": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "d", "Publisher": "SEC", "Section": "3", "Subparagraph": "(4)(iii)", "Subsection": "10" }, "r324": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "d", "Publisher": "SEC", "Section": "3", "Subparagraph": "(4)(iv)", "Subsection": "10" }, "r325": { "Name": "Regulation S-X (SX)", "Number": "210", "Paragraph": "i", "Publisher": "SEC", "Section": "3", "Subsection": "10" }, "r33": { "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" }, "r34": { "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" }, "r35": { "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" }, "r36": { "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" }, "r37": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-02.28(b))", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r38": { "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" }, "r39": { "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" }, "r4": { "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" }, "r40": { "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" }, "r41": { "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" }, "r42": { "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" }, "r43": { "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" }, "r44": { "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" }, "r45": { "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" }, "r46": { "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" }, "r47": { "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" }, "r48": { "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" }, "r49": { "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" }, "r5": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(27)", "Topic": "210", "URI": "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682" }, "r50": { "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" }, "r51": { "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" }, "r52": { "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" }, "r53": { "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" }, "r54": { "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" }, "r55": { "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" }, "r56": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(210.5-03(11))", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r57": { "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" }, "r58": { "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" }, "r59": { "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" }, "r6": { "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" }, "r60": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.1,2)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r61": { "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" }, "r62": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.4)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r63": { "Name": "Accounting Standards Codification", "Paragraph": "2", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.5-03.8)", "Topic": "220", "URI": "http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227" }, "r64": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "220", "URI": "http://asc.fasb.org/topic&trid=2134417" }, "r65": { "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" }, "r66": { "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" }, "r67": { "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" }, "r68": { "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" }, "r69": { "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" }, "r7": { "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" }, "r70": { "Name": "Accounting Standards Codification", "Paragraph": "14", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(a)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585" }, "r71": { "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" }, "r72": { "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" }, "r73": { "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" }, "r74": { "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" }, "r75": { "Name": "Accounting Standards Codification", "Paragraph": "15", "Publisher": "FASB", "Section": "45", "SubTopic": "10", "Subparagraph": "(e)", "Topic": "230", "URI": "http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585" }, "r76": { "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" }, "r77": { "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" }, "r78": { "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" }, "r79": { "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" }, "r8": { "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" }, "r80": { "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" }, "r81": { "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" }, "r82": { "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" }, "r83": { "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" }, "r84": { "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" }, "r85": { "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" }, "r86": { "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" }, "r87": { "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" }, "r88": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08(d)(1))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r89": { "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" }, "r9": { "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" }, "r90": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(d)(1))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r91": { "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" }, "r92": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(f))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r93": { "Name": "Accounting Standards Codification", "Paragraph": "1", "Publisher": "FASB", "Section": "S99", "SubTopic": "10", "Subparagraph": "(SX 210.4-08.(h)(1)(i))", "Topic": "235", "URI": "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690" }, "r94": { "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" }, "r95": { "Name": "Accounting Standards Codification", "Publisher": "FASB", "Topic": "235", "URI": "http://asc.fasb.org/topic&trid=2122369" }, "r96": { "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" }, "r97": { "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" }, "r98": { "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" }, "r99": { "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" } }, "version": "2.1" }