3.8.0.1 html 329 448 1 false 104 0 false 8 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.versummaterials.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - ANNUAL CONSOLIDATED INCOME STATEMENTS Sheet http://www.versummaterials.com/role/AnnualConsolidatedIncomeStatements ANNUAL CONSOLIDATED INCOME STATEMENTS Statements 2 false false R3.htm 1002000 - Statement - ANNUAL CONSOLIDATED COMPREHENSIVE INCOME STATEMENTS Sheet http://www.versummaterials.com/role/AnnualConsolidatedComprehensiveIncomeStatements ANNUAL CONSOLIDATED COMPREHENSIVE INCOME STATEMENTS Statements 3 false false R4.htm 1002001 - Statement - ANNUAL CONSOLIDATED COMPREHENSIVE INCOME STATEMENTS (Parentheticals) Sheet http://www.versummaterials.com/role/AnnualConsolidatedComprehensiveIncomeStatementsParentheticals ANNUAL CONSOLIDATED COMPREHENSIVE INCOME STATEMENTS (Parentheticals) Statements 4 false false R5.htm 1003000 - Statement - ANNUAL CONSOLIDATED BALANCE SHEETS Sheet http://www.versummaterials.com/role/AnnualConsolidatedBalanceSheets ANNUAL CONSOLIDATED BALANCE SHEETS Statements 5 false false R6.htm 1004000 - Statement - ANNUAL CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.versummaterials.com/role/AnnualConsolidatedStatementsOfCashFlows ANNUAL CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 1005000 - Statement - ANNUAL CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND NONCONTROLLING INTERESTS Sheet http://www.versummaterials.com/role/AnnualConsolidatedStatementsOfChangesInEquityAndNoncontrollingInterests ANNUAL CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND NONCONTROLLING INTERESTS Statements 7 false false R8.htm 2101100 - Disclosure - Basis of Presentation Sheet http://www.versummaterials.com/role/BasisOfPresentation Basis of Presentation Notes 8 false false R9.htm 2104100 - Disclosure - Major Accounting Policies Sheet http://www.versummaterials.com/role/MajorAccountingPolicies Major Accounting Policies Notes 9 false false R10.htm 2107100 - Disclosure - New Accounting Guidance Sheet http://www.versummaterials.com/role/NewAccountingGuidance New Accounting Guidance Notes 10 false false R11.htm 2110100 - Disclosure - Related Party Transactions Sheet http://www.versummaterials.com/role/RelatedPartyTransactions Related Party Transactions Notes 11 false false R12.htm 2113100 - Disclosure - Business Separation, Restructuring, and Cost Reduction Actions Sheet http://www.versummaterials.com/role/BusinessSeparationRestructuringAndCostReductionActions Business Separation, Restructuring, and Cost Reduction Actions Notes 12 false false R13.htm 2116100 - Disclosure - Sale of Equity Affiliate Sheet http://www.versummaterials.com/role/SaleOfEquityAffiliate Sale of Equity Affiliate Notes 13 false false R14.htm 2119100 - Disclosure - Inventories Sheet http://www.versummaterials.com/role/Inventories Inventories Notes 14 false false R15.htm 2122100 - Disclosure - Plant and Equipment, Net Sheet http://www.versummaterials.com/role/PlantAndEquipmentNet Plant and Equipment, Net Notes 15 false false R16.htm 2125100 - Disclosure - Goodwill Sheet http://www.versummaterials.com/role/Goodwill Goodwill Notes 16 false false R17.htm 2128100 - Disclosure - Intangible Assets Sheet http://www.versummaterials.com/role/IntangibleAssets Intangible Assets Notes 17 false false R18.htm 2131100 - Disclosure - Debt Sheet http://www.versummaterials.com/role/Debt Debt Notes 18 false false R19.htm 2134100 - Disclosure - Leases Sheet http://www.versummaterials.com/role/Leases Leases Notes 19 false false R20.htm 2137100 - Disclosure - Fair Value Sheet http://www.versummaterials.com/role/FairValue Fair Value Notes 20 false false R21.htm 2140100 - Disclosure - Financial Instruments Financial instruments Sheet http://www.versummaterials.com/role/FinancialInstrumentsFinancialInstruments Financial Instruments Financial instruments Notes 21 false false R22.htm 2143100 - Disclosure - Retirement Benefits Sheet http://www.versummaterials.com/role/RetirementBenefits Retirement Benefits Notes 22 false false R23.htm 2149100 - Disclosure - Share Based Compensation Share Based Compensation Sheet http://www.versummaterials.com/role/ShareBasedCompensationShareBasedCompensation Share Based Compensation Share Based Compensation Notes 23 false false R24.htm 2152100 - Disclosure - Stock Holders Equity Stock Holders Equity Sheet http://www.versummaterials.com/role/StockHoldersEquityStockHoldersEquity Stock Holders Equity Stock Holders Equity Notes 24 false false R25.htm 2155100 - Disclosure - Earnings Per Share Earnings Per Share Sheet http://www.versummaterials.com/role/EarningsPerShareEarningsPerShare Earnings Per Share Earnings Per Share Notes 25 false false R26.htm 2158100 - Disclosure - Income Taxes Sheet http://www.versummaterials.com/role/IncomeTaxes Income Taxes Notes 26 false false R27.htm 2159100 - Disclosure - Supplemental Information Sheet http://www.versummaterials.com/role/SupplementalInformation Supplemental Information Notes 27 false false R28.htm 2160100 - Disclosure - Commitments and Contingencies Sheet http://www.versummaterials.com/role/CommitmentsAndContingencies Commitments and Contingencies Notes 28 false false R29.htm 2161100 - Disclosure - Segment and Geographic Information Sheet http://www.versummaterials.com/role/SegmentAndGeographicInformation Segment and Geographic Information Notes 29 false false R30.htm 2162100 - Disclosure - Acquisition Acquisition Sheet http://www.versummaterials.com/role/AcquisitionAcquisition Acquisition Acquisition Notes 30 false false R31.htm 2163100 - Disclosure - Subsequent Events Sheet http://www.versummaterials.com/role/SubsequentEvents Subsequent Events Notes 31 false false R32.htm 2164100 - Disclosure - Summary By Quarter (Unaudited) Sheet http://www.versummaterials.com/role/SummaryByQuarterUnaudited Summary By Quarter (Unaudited) Notes 32 false false R33.htm 2165100 - Disclosure - Schedule II-Valuation and Qualifying Accounts Sheet http://www.versummaterials.com/role/ScheduleIiValuationAndQualifyingAccounts Schedule II-Valuation and Qualifying Accounts Notes 33 false false R34.htm 2204201 - Disclosure - Major Accounting Policies (Policies) Sheet http://www.versummaterials.com/role/MajorAccountingPoliciesPolicies Major Accounting Policies (Policies) Policies http://www.versummaterials.com/role/MajorAccountingPolicies 34 false false R35.htm 2310301 - Disclosure - Related Party Transactions (Tables) Sheet http://www.versummaterials.com/role/RelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://www.versummaterials.com/role/RelatedPartyTransactions 35 false false R36.htm 2313301 - Disclosure - Business Separation, Restructuring, and Cost Reduction Actions (Tables) Sheet http://www.versummaterials.com/role/BusinessSeparationRestructuringAndCostReductionActionsTables Business Separation, Restructuring, and Cost Reduction Actions (Tables) Tables http://www.versummaterials.com/role/BusinessSeparationRestructuringAndCostReductionActions 36 false false R37.htm 2319301 - Disclosure - Inventories (Tables) Sheet http://www.versummaterials.com/role/InventoriesTables Inventories (Tables) Tables http://www.versummaterials.com/role/Inventories 37 false false R38.htm 2322301 - Disclosure - Plant and Equipment, Net (Tables) Sheet http://www.versummaterials.com/role/PlantAndEquipmentNetTables Plant and Equipment, Net (Tables) Tables http://www.versummaterials.com/role/PlantAndEquipmentNet 38 false false R39.htm 2325301 - Disclosure - Goodwill (Tables) Sheet http://www.versummaterials.com/role/GoodwillTables Goodwill (Tables) Tables http://www.versummaterials.com/role/Goodwill 39 false false R40.htm 2328301 - Disclosure - Intangible Assets (Tables) Sheet http://www.versummaterials.com/role/IntangibleAssetsTables Intangible Assets (Tables) Tables http://www.versummaterials.com/role/IntangibleAssets 40 false false R41.htm 2331301 - Disclosure - Debt (Tables) Sheet http://www.versummaterials.com/role/DebtTables Debt (Tables) Tables http://www.versummaterials.com/role/Debt 41 false false R42.htm 2334301 - Disclosure - Leases (Tables) Sheet http://www.versummaterials.com/role/LeasesTables Leases (Tables) Tables http://www.versummaterials.com/role/Leases 42 false false R43.htm 2337301 - Disclosure - Fair Value (Tables) Sheet http://www.versummaterials.com/role/FairValueTables Fair Value (Tables) Tables http://www.versummaterials.com/role/FairValue 43 false false R44.htm 2340301 - Disclosure - Financial Instruments (Tables) Sheet http://www.versummaterials.com/role/FinancialInstrumentsTables Financial Instruments (Tables) Tables http://www.versummaterials.com/role/FinancialInstrumentsFinancialInstruments 44 false false R45.htm 2343301 - Disclosure - Retirement Benefits (Tables) Sheet http://www.versummaterials.com/role/RetirementBenefitsTables Retirement Benefits (Tables) Tables http://www.versummaterials.com/role/RetirementBenefits 45 false false R46.htm 2349301 - Disclosure - Share Based Compensation (Tables) Sheet http://www.versummaterials.com/role/ShareBasedCompensationTables Share Based Compensation (Tables) Tables http://www.versummaterials.com/role/ShareBasedCompensationShareBasedCompensation 46 false false R47.htm 2352301 - Disclosure - Stock Holders Equity (Tables) Sheet http://www.versummaterials.com/role/StockHoldersEquityTables Stock Holders Equity (Tables) Tables http://www.versummaterials.com/role/StockHoldersEquityStockHoldersEquity 47 false false R48.htm 2355301 - Disclosure - Earnings Per Share (Tables) Sheet http://www.versummaterials.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.versummaterials.com/role/EarningsPerShareEarningsPerShare 48 false false R49.htm 2358301 - Disclosure - Income Taxes (Tables) Sheet http://www.versummaterials.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.versummaterials.com/role/IncomeTaxes 49 false false R50.htm 2359301 - Disclosure - Supplemental Information (Tables) Sheet http://www.versummaterials.com/role/SupplementalInformationTables Supplemental Information (Tables) Tables http://www.versummaterials.com/role/SupplementalInformation 50 false false R51.htm 2361301 - Disclosure - Segment and Geographic Information (Tables) Sheet http://www.versummaterials.com/role/SegmentAndGeographicInformationTables Segment and Geographic Information (Tables) Tables http://www.versummaterials.com/role/SegmentAndGeographicInformation 51 false false R52.htm 2362301 - Disclosure - Acquisition (Tables) Sheet http://www.versummaterials.com/role/AcquisitionTables Acquisition (Tables) Tables http://www.versummaterials.com/role/AcquisitionAcquisition 52 false false R53.htm 2364301 - Disclosure - Summary By Quarter (Unaudited) (Tables) Sheet http://www.versummaterials.com/role/SummaryByQuarterUnauditedTables Summary By Quarter (Unaudited) (Tables) Tables http://www.versummaterials.com/role/SummaryByQuarterUnaudited 53 false false R54.htm 2401401 - Disclosure - Basis of Presentation (Details) Sheet http://www.versummaterials.com/role/BasisOfPresentationDetails Basis of Presentation (Details) Details http://www.versummaterials.com/role/BasisOfPresentation 54 false false R55.htm 2404402 - Disclosure - Major Accounting Policies (Details) Sheet http://www.versummaterials.com/role/MajorAccountingPoliciesDetails Major Accounting Policies (Details) Details http://www.versummaterials.com/role/MajorAccountingPoliciesPolicies 55 false false R56.htm 2410402 - Disclosure - Related Party Transactions (Details) Sheet http://www.versummaterials.com/role/RelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://www.versummaterials.com/role/RelatedPartyTransactionsTables 56 false false R57.htm 2413402 - Disclosure - Business Separation, Restructuring, and Cost Reduction Actions (Narrative) (Details) Sheet http://www.versummaterials.com/role/BusinessSeparationRestructuringAndCostReductionActionsNarrativeDetails Business Separation, Restructuring, and Cost Reduction Actions (Narrative) (Details) Details http://www.versummaterials.com/role/BusinessSeparationRestructuringAndCostReductionActionsTables 57 false false R58.htm 2413403 - Disclosure - Business Separation, Restructuring, and Cost Reduction Actions (Details) Sheet http://www.versummaterials.com/role/BusinessSeparationRestructuringAndCostReductionActionsDetails Business Separation, Restructuring, and Cost Reduction Actions (Details) Details http://www.versummaterials.com/role/BusinessSeparationRestructuringAndCostReductionActionsTables 58 false false R59.htm 2416401 - Disclosure - Sale of Equity Affiliate (Details) Sheet http://www.versummaterials.com/role/SaleOfEquityAffiliateDetails Sale of Equity Affiliate (Details) Details http://www.versummaterials.com/role/SaleOfEquityAffiliate 59 false false R60.htm 2419402 - Disclosure - Inventories (Details) Sheet http://www.versummaterials.com/role/InventoriesDetails Inventories (Details) Details http://www.versummaterials.com/role/InventoriesTables 60 false false R61.htm 2419403 - Disclosure - Inventories (Narrative) (Details) Sheet http://www.versummaterials.com/role/InventoriesNarrativeDetails Inventories (Narrative) (Details) Details http://www.versummaterials.com/role/InventoriesTables 61 false false R62.htm 2422402 - Disclosure - Plant and Equipment, Net (Details) Sheet http://www.versummaterials.com/role/PlantAndEquipmentNetDetails Plant and Equipment, Net (Details) Details http://www.versummaterials.com/role/PlantAndEquipmentNetTables 62 false false R63.htm 2422403 - Disclosure - Plant and Equipment, Net (Narrative) (Details) Sheet http://www.versummaterials.com/role/PlantAndEquipmentNetNarrativeDetails Plant and Equipment, Net (Narrative) (Details) Details http://www.versummaterials.com/role/PlantAndEquipmentNetTables 63 false false R64.htm 2425402 - Disclosure - Goodwill (Details) Sheet http://www.versummaterials.com/role/GoodwillDetails Goodwill (Details) Details http://www.versummaterials.com/role/GoodwillTables 64 false false R65.htm 2425403 - Disclosure - Goodwill (Narrative) (Details) Sheet http://www.versummaterials.com/role/GoodwillNarrativeDetails Goodwill (Narrative) (Details) Details http://www.versummaterials.com/role/GoodwillTables 65 false false R66.htm 2428402 - Disclosure - Intangible Assets - Acquired Intangible Assets (Details) Sheet http://www.versummaterials.com/role/IntangibleAssetsAcquiredIntangibleAssetsDetails Intangible Assets - Acquired Intangible Assets (Details) Details 66 false false R67.htm 2428403 - Disclosure - Intangible Assets (Narrative) (Details) Sheet http://www.versummaterials.com/role/IntangibleAssetsNarrativeDetails Intangible Assets (Narrative) (Details) Details http://www.versummaterials.com/role/IntangibleAssetsTables 67 false false R68.htm 2428404 - Disclosure - Intangible Assets - Projected Annual Amortization Expense for Intangible Assets (Details) Sheet http://www.versummaterials.com/role/IntangibleAssetsProjectedAnnualAmortizationExpenseForIntangibleAssetsDetails Intangible Assets - Projected Annual Amortization Expense for Intangible Assets (Details) Details 68 false false R69.htm 2431402 - Disclosure - Debt Components of Debt (Details) Sheet http://www.versummaterials.com/role/DebtComponentsOfDebtDetails Debt Components of Debt (Details) Details 69 false false R70.htm 2431403 - Disclosure - Debt Components of Long Term Debt (Details) Sheet http://www.versummaterials.com/role/DebtComponentsOfLongTermDebtDetails Debt Components of Long Term Debt (Details) Details 70 false false R71.htm 2431404 - Disclosure - Debt Long-term Debt Maturities (Details) Sheet http://www.versummaterials.com/role/DebtLongTermDebtMaturitiesDetails Debt Long-term Debt Maturities (Details) Details 71 false false R72.htm 2431405 - Disclosure - Debt (Narrative) (Details) Sheet http://www.versummaterials.com/role/DebtNarrativeDetails Debt (Narrative) (Details) Details http://www.versummaterials.com/role/DebtTables 72 false false R73.htm 2434402 - Disclosure - Leases (Details) Sheet http://www.versummaterials.com/role/LeasesDetails Leases (Details) Details http://www.versummaterials.com/role/LeasesTables 73 false false R74.htm 2437402 - Disclosure - Fair Value (Details) Sheet http://www.versummaterials.com/role/FairValueDetails Fair Value (Details) Details http://www.versummaterials.com/role/FairValueTables 74 false false R75.htm 2440402 - Disclosure - Financial Instruments (Details) Sheet http://www.versummaterials.com/role/FinancialInstrumentsDetails Financial Instruments (Details) Details http://www.versummaterials.com/role/FinancialInstrumentsTables 75 false false R76.htm 2440403 - Disclosure - Financial Instruments Fair Value and Balance Sheet Location of Outstanding Derivatives (Details) Sheet http://www.versummaterials.com/role/FinancialInstrumentsFairValueAndBalanceSheetLocationOfOutstandingDerivativesDetails Financial Instruments Fair Value and Balance Sheet Location of Outstanding Derivatives (Details) Details 76 false false R77.htm 2440404 - Disclosure - Financial Instruments Gain or Loss Related to Forward Contracts (Details) Sheet http://www.versummaterials.com/role/FinancialInstrumentsGainOrLossRelatedToForwardContractsDetails Financial Instruments Gain or Loss Related to Forward Contracts (Details) Details 77 false false R78.htm 2443402 - Disclosure - Retirement Benefits - Benefit Obligation, Fair Value of Plan Assets and Funded Status (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsBenefitObligationFairValueOfPlanAssetsAndFundedStatusDetails Retirement Benefits - Benefit Obligation, Fair Value of Plan Assets and Funded Status (Details) Details 78 false false R79.htm 2443403 - Disclosure - Retirement Benefits - Amounts Recognized in Balance Sheet (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsAmountsRecognizedInBalanceSheetDetails Retirement Benefits - Amounts Recognized in Balance Sheet (Details) Details 79 false false R80.htm 2443404 - Disclosure - Retirement Benefits - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsAmountsRecognizedInAccumulatedOtherComprehensiveLossDetails Retirement Benefits - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) Details 80 false false R81.htm 2443405 - Disclosure - Retirement Benefits - Components of Net Periodic Pension Costs (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsComponentsOfNetPeriodicPensionCostsDetails Retirement Benefits - Components of Net Periodic Pension Costs (Details) Details 81 false false R82.htm 2443406 - Disclosure - Retirement Benefits - Narrative (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsNarrativeDetails Retirement Benefits - Narrative (Details) Details 82 false false R83.htm 2443407 - Disclosure - Retirement Benefits - Assumptions Used for Defined Benefit Obligation and Net Periodic Pension Cost (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsAssumptionsUsedForDefinedBenefitObligationAndNetPeriodicPensionCostDetails Retirement Benefits - Assumptions Used for Defined Benefit Obligation and Net Periodic Pension Cost (Details) Details 83 false false R84.htm 2443408 - Disclosure - Retirement Benefits - Fair Value of Pension Plan Assets (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsFairValueOfPensionPlanAssetsDetails Retirement Benefits - Fair Value of Pension Plan Assets (Details) Details 84 false false R85.htm 2443409 - Disclosure - Retirement Benefits - Expected Future Benefit Payments (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsExpectedFutureBenefitPaymentsDetails Retirement Benefits - Expected Future Benefit Payments (Details) Details 85 false false R86.htm 2443410 - Disclosure - Retirement Benefits - Defined Contribution Expense (Details) Sheet http://www.versummaterials.com/role/RetirementBenefitsDefinedContributionExpenseDetails Retirement Benefits - Defined Contribution Expense (Details) Details 86 false false R87.htm 2449402 - Disclosure - Share Based Compensation (Details) Sheet http://www.versummaterials.com/role/ShareBasedCompensationDetails Share Based Compensation (Details) Details http://www.versummaterials.com/role/ShareBasedCompensationTables 87 false false R88.htm 2449403 - Disclosure - Share Based Compensation Compensation Awards Cost Recognized (Details) Sheet http://www.versummaterials.com/role/ShareBasedCompensationCompensationAwardsCostRecognizedDetails Share Based Compensation Compensation Awards Cost Recognized (Details) Details 88 false false R89.htm 2449404 - Disclosure - Share Based Compensation Before-tax Share-Based Compensation Award (Details) Sheet http://www.versummaterials.com/role/ShareBasedCompensationBeforeTaxShareBasedCompensationAwardDetails Share Based Compensation Before-tax Share-Based Compensation Award (Details) Details 89 false false R90.htm 2449405 - Disclosure - Share Based Compensation Assumptions used in Calculation of Fair Value of Market-based Restricted Stock Units (Details) Sheet http://www.versummaterials.com/role/ShareBasedCompensationAssumptionsUsedInCalculationOfFairValueOfMarketBasedRestrictedStockUnitsDetails Share Based Compensation Assumptions used in Calculation of Fair Value of Market-based Restricted Stock Units (Details) Details 90 false false R91.htm 2449406 - Disclosure - Share Based Compensation Summary of Restricted Stock Unit Activity (Details) Sheet http://www.versummaterials.com/role/ShareBasedCompensationSummaryOfRestrictedStockUnitActivityDetails Share Based Compensation Summary of Restricted Stock Unit Activity (Details) Details 91 false false R92.htm 2449407 - Disclosure - Share Based Compensation Summary of Stock Option Activity (Details) Sheet http://www.versummaterials.com/role/ShareBasedCompensationSummaryOfStockOptionActivityDetails Share Based Compensation Summary of Stock Option Activity (Details) Details 92 false false R93.htm 2452402 - Disclosure - Stock Holders Equity Changes in Accumulated Other Comprehensive Loss (Details) Sheet http://www.versummaterials.com/role/StockHoldersEquityChangesInAccumulatedOtherComprehensiveLossDetails Stock Holders Equity Changes in Accumulated Other Comprehensive Loss (Details) Details 93 false false R94.htm 2452403 - Disclosure - Stock Holders Equity Reclassification Out of Accumulated Other Comprehensive Loss (Details) Sheet http://www.versummaterials.com/role/StockHoldersEquityReclassificationOutOfAccumulatedOtherComprehensiveLossDetails Stock Holders Equity Reclassification Out of Accumulated Other Comprehensive Loss (Details) Details 94 false false R95.htm 2452404 - Disclosure - Stock Holders Equity Cash Dividends (Details) Sheet http://www.versummaterials.com/role/StockHoldersEquityCashDividendsDetails Stock Holders Equity Cash Dividends (Details) Details 95 false false R96.htm 2455402 - Disclosure - Earnings Per Share (Details) Sheet http://www.versummaterials.com/role/EarningsPerShareDetails Earnings Per Share (Details) Details http://www.versummaterials.com/role/EarningsPerShareTables 96 false false R97.htm 2458402 - Disclosure - Income Taxes - Income Before Taxes (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesIncomeBeforeTaxesDetails Income Taxes - Income Before Taxes (Details) Details 97 false false R98.htm 2458403 - Disclosure - Income Taxes - Components of Provision for Income Taxes (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesComponentsOfProvisionForIncomeTaxesDetails Income Taxes - Components of Provision for Income Taxes (Details) Details 98 false false R99.htm 2458404 - Disclosure - Income Taxes - Effective Tax Rate Reconciliation (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesEffectiveTaxRateReconciliationDetails Income Taxes - Effective Tax Rate Reconciliation (Details) Details 99 false false R100.htm 2458405 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Details http://www.versummaterials.com/role/IncomeTaxesTables 100 false false R101.htm 2458406 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails Income Taxes - Deferred Tax Assets and Liabilities (Details) Details 101 false false R102.htm 2458407 - Disclosure - Income Taxes - Net Deferred Income Tax Liability (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesNetDeferredIncomeTaxLiabilityDetails Income Taxes - Net Deferred Income Tax Liability (Details) Details 102 false false R103.htm 2458408 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails Income Taxes - Unrecognized Tax Benefits (Details) Details 103 false false R104.htm 2458409 - Disclosure - Income Taxes - Summary of Income Tax Examinations (Details) Sheet http://www.versummaterials.com/role/IncomeTaxesSummaryOfIncomeTaxExaminationsDetails Income Taxes - Summary of Income Tax Examinations (Details) Details 104 false false R105.htm 2459402 - Disclosure - Supplemental Information - Payables and Accrued Liabilities (Details) Sheet http://www.versummaterials.com/role/SupplementalInformationPayablesAndAccruedLiabilitiesDetails Supplemental Information - Payables and Accrued Liabilities (Details) Details 105 false false R106.htm 2460401 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.versummaterials.com/role/CommitmentsAndContingenciesDetails Commitments and Contingencies (Details) Details http://www.versummaterials.com/role/CommitmentsAndContingencies 106 false false R107.htm 2461402 - Disclosure - Segment and Geographic Information (Narrative) (Details) Sheet http://www.versummaterials.com/role/SegmentAndGeographicInformationNarrativeDetails Segment and Geographic Information (Narrative) (Details) Details http://www.versummaterials.com/role/SegmentAndGeographicInformationTables 107 false false R108.htm 2461403 - Disclosure - Segment and Geographic Information - Segments (Details) Sheet http://www.versummaterials.com/role/SegmentAndGeographicInformationSegmentsDetails Segment and Geographic Information - Segments (Details) Details 108 false false R109.htm 2461404 - Disclosure - Segment and Geographic Information - Sales by Product Group (Details) Sheet http://www.versummaterials.com/role/SegmentAndGeographicInformationSalesByProductGroupDetails Segment and Geographic Information - Sales by Product Group (Details) Details 109 false false R110.htm 2461405 - Disclosure - Segment and Geographic Information - Geographic Information (Details) Sheet http://www.versummaterials.com/role/SegmentAndGeographicInformationGeographicInformationDetails Segment and Geographic Information - Geographic Information (Details) Details 110 false false R111.htm 2462402 - Disclosure - Acquisition - Narrative (Details) Sheet http://www.versummaterials.com/role/AcquisitionNarrativeDetails Acquisition - Narrative (Details) Details 111 false false R112.htm 2462403 - Disclosure - Acquisition - Purchase Price Allocation (Details) Sheet http://www.versummaterials.com/role/AcquisitionPurchasePriceAllocationDetails Acquisition - Purchase Price Allocation (Details) Details 112 false false R113.htm 2462404 - Disclosure - Acquisition - Intangibles Business Combination (Details) Sheet http://www.versummaterials.com/role/AcquisitionIntangiblesBusinessCombinationDetails Acquisition - Intangibles Business Combination (Details) Details 113 false false R114.htm 2463401 - Disclosure - Subsequent Events (Details) Sheet http://www.versummaterials.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://www.versummaterials.com/role/SubsequentEvents 114 false false R115.htm 2464402 - Disclosure - Summary By Quarter (Unaudited) (Details) Sheet http://www.versummaterials.com/role/SummaryByQuarterUnauditedDetails Summary By Quarter (Unaudited) (Details) Details http://www.versummaterials.com/role/SummaryByQuarterUnauditedTables 115 false false R116.htm 2465401 - Disclosure - Schedule II-Valuation and Qualifying Accounts (Details) Sheet http://www.versummaterials.com/role/ScheduleIiValuationAndQualifyingAccountsDetails Schedule II-Valuation and Qualifying Accounts (Details) Details http://www.versummaterials.com/role/ScheduleIiValuationAndQualifyingAccounts 116 false false All Reports Book All Reports vsm-20170930.xml vsm-20170930.xsd vsm-20170930_cal.xml vsm-20170930_def.xml vsm-20170930_lab.xml vsm-20170930_pre.xml http://xbrl.sec.gov/invest/2013-01-31 http://xbrl.sec.gov/dei/2014-01-31 http://fasb.org/us-gaap/2016-01-31 http://xbrl.sec.gov/country/2016-01-31 true true