3.20.2 html 299 598 1 false 88 0 false 10 false false R1.htm 0001001 - Document - Cover Sheet http://www.quanexbuildingproducts.com/role/Cover Cover Cover 1 false false R2.htm 1001002 - Statement - Consolidated Balance Sheets Sheet http://www.quanexbuildingproducts.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 1002003 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.quanexbuildingproducts.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 3 false false R4.htm 1003004 - Statement - Consolidated Statements of Income (Loss) Sheet http://www.quanexbuildingproducts.com/role/ConsolidatedStatementsofIncomeLoss Consolidated Statements of Income (Loss) Statements 4 false false R5.htm 1005006 - Statement - Consolidated Statements of Comprehensive Income (Loss) Sheet http://www.quanexbuildingproducts.com/role/ConsolidatedStatementsofComprehensiveIncomeLoss Consolidated Statements of Comprehensive Income (Loss) Statements 5 false false R6.htm 1006007 - Statement - Consolidated Statement of Stockholders' Equity Sheet http://www.quanexbuildingproducts.com/role/ConsolidatedStatementofStockholdersEquity Consolidated Statement of Stockholders' Equity Statements 6 false false R7.htm 1007008 - Statement - Consolidated Statement of Stockholders' Equity (Parenthetical) Sheet http://www.quanexbuildingproducts.com/role/ConsolidatedStatementofStockholdersEquityParenthetical Consolidated Statement of Stockholders' Equity (Parenthetical) Statements 7 false false R8.htm 1008009 - Statement - Consolidated Statements of Cash Flow Sheet http://www.quanexbuildingproducts.com/role/ConsolidatedStatementsofCashFlow Consolidated Statements of Cash Flow Statements 8 false false R9.htm 2101101 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPolicies Nature of Operations, Basis of Presentation and Significant Accounting Policies Notes 9 false false R10.htm 2112102 - Disclosure - Receivables & Allowance Sheet http://www.quanexbuildingproducts.com/role/ReceivablesAllowance Receivables & Allowance Notes 10 false false R11.htm 2115103 - Disclosure - Inventories Sheet http://www.quanexbuildingproducts.com/role/Inventories Inventories Notes 11 false false R12.htm 2118104 - Disclosure - Property, Plant & Equipment Sheet http://www.quanexbuildingproducts.com/role/PropertyPlantEquipment Property, Plant & Equipment Notes 12 false false R13.htm 2121105 - Disclosure - Leases Sheet http://www.quanexbuildingproducts.com/role/Leases Leases Notes 13 false false R14.htm 2124106 - Disclosure - Goodwill and Intangible Assets Sheet http://www.quanexbuildingproducts.com/role/GoodwillandIntangibleAssets Goodwill and Intangible Assets Notes 14 false false R15.htm 2127107 - Disclosure - Accrued Liabilities Sheet http://www.quanexbuildingproducts.com/role/AccruedLiabilities Accrued Liabilities Notes 15 false false R16.htm 2136109 - Disclosure - Retirement Plans Sheet http://www.quanexbuildingproducts.com/role/RetirementPlans Retirement Plans Notes 16 false false R17.htm 2139110 - Disclosure - Income Taxes Sheet http://www.quanexbuildingproducts.com/role/IncomeTaxes Income Taxes Notes 17 false false R18.htm 2143111 - Disclosure - Commitments and Contingencies Sheet http://www.quanexbuildingproducts.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 18 false false R19.htm 2145112 - Disclosure - Fair Value Measurement of Assets and Liabilities Sheet http://www.quanexbuildingproducts.com/role/FairValueMeasurementofAssetsandLiabilities Fair Value Measurement of Assets and Liabilities Notes 19 false false R20.htm 2147113 - Disclosure - Stock-Based Compensation Sheet http://www.quanexbuildingproducts.com/role/StockBasedCompensation Stock-Based Compensation Notes 20 false false R21.htm 2150114 - Disclosure - Stockholders' Equity Sheet http://www.quanexbuildingproducts.com/role/StockholdersEquity Stockholders' Equity Notes 21 false false R22.htm 2152115 - Disclosure - Other Income (Expense) Sheet http://www.quanexbuildingproducts.com/role/OtherIncomeExpense Other Income (Expense) Notes 22 false false R23.htm 2155116 - Disclosure - Segment Information Sheet http://www.quanexbuildingproducts.com/role/SegmentInformation Segment Information Notes 23 false false R24.htm 2158117 - Disclosure - Earnings Per Share Sheet http://www.quanexbuildingproducts.com/role/EarningsPerShare Earnings Per Share Notes 24 false false R25.htm 2161118 - Disclosure - Unaudited Quarterly Data Sheet http://www.quanexbuildingproducts.com/role/UnauditedQuarterlyData Unaudited Quarterly Data Notes 25 false false R26.htm 2164119 - Disclosure - New Accounting Guidance Sheet http://www.quanexbuildingproducts.com/role/NewAccountingGuidance New Accounting Guidance Notes 26 false false R27.htm 2202201 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies (Policies) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesPolicies Nature of Operations, Basis of Presentation and Significant Accounting Policies (Policies) Policies http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPolicies 27 false false R28.htm 2303301 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies (Tables) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesTables Nature of Operations, Basis of Presentation and Significant Accounting Policies (Tables) Tables http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPolicies 28 false false R29.htm 2313302 - Disclosure - Receivables & Allowance (Tables) Sheet http://www.quanexbuildingproducts.com/role/ReceivablesAllowanceTables Receivables & Allowance (Tables) Tables http://www.quanexbuildingproducts.com/role/ReceivablesAllowance 29 false false R30.htm 2316303 - Disclosure - Inventories (Tables) Sheet http://www.quanexbuildingproducts.com/role/InventoriesTables Inventories (Tables) Tables http://www.quanexbuildingproducts.com/role/Inventories 30 false false R31.htm 2319304 - Disclosure - Property, Plant & and Equipment (Tables) Sheet http://www.quanexbuildingproducts.com/role/PropertyPlantandEquipmentTables Property, Plant & and Equipment (Tables) Tables 31 false false R32.htm 2322305 - Disclosure - Leases, Codification Topic 842 (Tables) Sheet http://www.quanexbuildingproducts.com/role/LeasesCodificationTopic842Tables Leases, Codification Topic 842 (Tables) Tables 32 false false R33.htm 2325306 - Disclosure - Goodwill and Intangible Assets (Tables) Sheet http://www.quanexbuildingproducts.com/role/GoodwillandIntangibleAssetsTables Goodwill and Intangible Assets (Tables) Tables http://www.quanexbuildingproducts.com/role/GoodwillandIntangibleAssets 33 false false R34.htm 2328307 - Disclosure - Accrued Liabilities (Tables) Sheet http://www.quanexbuildingproducts.com/role/AccruedLiabilitiesTables Accrued Liabilities (Tables) Tables http://www.quanexbuildingproducts.com/role/AccruedLiabilities 34 false false R35.htm 2331308 - Disclosure - Debt and Capital Lease Obligations (Tables) Sheet http://www.quanexbuildingproducts.com/role/DebtandCapitalLeaseObligationsTables Debt and Capital Lease Obligations (Tables) Tables 35 false false R36.htm 2337309 - Disclosure - Retirement Plans (Tables) Sheet http://www.quanexbuildingproducts.com/role/RetirementPlansTables Retirement Plans (Tables) Tables http://www.quanexbuildingproducts.com/role/RetirementPlans 36 false false R37.htm 2340310 - Disclosure - Income Tax (Tables) Sheet http://www.quanexbuildingproducts.com/role/IncomeTaxTables Income Tax (Tables) Tables http://www.quanexbuildingproducts.com/role/IncomeTaxes 37 false false R38.htm 2348311 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.quanexbuildingproducts.com/role/StockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.quanexbuildingproducts.com/role/StockBasedCompensation 38 false false R39.htm 2353312 - Disclosure - Other Income (Expense) (Tables) Sheet http://www.quanexbuildingproducts.com/role/OtherIncomeExpenseTables Other Income (Expense) (Tables) Tables http://www.quanexbuildingproducts.com/role/OtherIncomeExpense 39 false false R40.htm 2356313 - Disclosure - Segment Information (Tables) Sheet http://www.quanexbuildingproducts.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.quanexbuildingproducts.com/role/SegmentInformation 40 false false R41.htm 2359314 - Disclosure - Earnings Per Share (Tables) Sheet http://www.quanexbuildingproducts.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.quanexbuildingproducts.com/role/EarningsPerShare 41 false false R42.htm 2362315 - Disclosure - Unaudited Quarterly Data (Tables) Sheet http://www.quanexbuildingproducts.com/role/UnauditedQuarterlyDataTables Unaudited Quarterly Data (Tables) Tables http://www.quanexbuildingproducts.com/role/UnauditedQuarterlyData 42 false false R43.htm 2404401 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Revenue from Contracts with Customers (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesRevenuefromContractswithCustomersDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Revenue from Contracts with Customers (Details) Details 43 false false R44.htm 2405402 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Concentration (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesConcentrationDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Concentration (Details) Details http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesTables 44 false false R45.htm 2406403 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Long Lived Assets (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesLongLivedAssetsDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Long Lived Assets (Details) Details http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesTables 45 false false R46.htm 2407404 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Goodwill (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesGoodwillDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Goodwill (Details) Details http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesTables 46 false false R47.htm 2408405 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Income Taxes (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesIncomeTaxesDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Income Taxes (Details) Details http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesTables 47 false false R48.htm 2409406 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Stock-Based Compensation (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesStockBasedCompensationDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Stock-Based Compensation (Details) Details 48 false false R49.htm 2410407 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Cash Flow (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesCashFlowDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Cash Flow (Details) Details http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesTables 49 false false R50.htm 2411408 - Disclosure - Nature of Operations, Basis of Presentation and Significant Accounting Policies, Related Party Transactions (Details) Sheet http://www.quanexbuildingproducts.com/role/NatureofOperationsBasisofPresentationandSignificantAccountingPoliciesRelatedPartyTransactionsDetails Nature of Operations, Basis of Presentation and Significant Accounting Policies, Related Party Transactions (Details) Details 50 false false R51.htm 2414409 - Disclosure - Receivables & Allowance (Details) Sheet http://www.quanexbuildingproducts.com/role/ReceivablesAllowanceDetails Receivables & Allowance (Details) Details http://www.quanexbuildingproducts.com/role/ReceivablesAllowanceTables 51 false false R52.htm 2417410 - Disclosure - Inventories (Detail) Sheet http://www.quanexbuildingproducts.com/role/InventoriesDetail Inventories (Detail) Details http://www.quanexbuildingproducts.com/role/InventoriesTables 52 false false R53.htm 2420411 - Disclosure - Property, Plant & and Equipment (Details) Sheet http://www.quanexbuildingproducts.com/role/PropertyPlantandEquipmentDetails Property, Plant & and Equipment (Details) Details http://www.quanexbuildingproducts.com/role/PropertyPlantandEquipmentTables 53 false false R54.htm 2423412 - Disclosure - Leases, Codification Topic 842 (Details) Sheet http://www.quanexbuildingproducts.com/role/LeasesCodificationTopic842Details Leases, Codification Topic 842 (Details) Details http://www.quanexbuildingproducts.com/role/LeasesCodificationTopic842Tables 54 false false R55.htm 2426413 - Disclosure - Goodwill and Intangible Assets (Detail) Sheet http://www.quanexbuildingproducts.com/role/GoodwillandIntangibleAssetsDetail Goodwill and Intangible Assets (Detail) Details http://www.quanexbuildingproducts.com/role/GoodwillandIntangibleAssetsTables 55 false false R56.htm 2429414 - Disclosure - Accrued Liabilities (Details) Sheet http://www.quanexbuildingproducts.com/role/AccruedLiabilitiesDetails Accrued Liabilities (Details) Details http://www.quanexbuildingproducts.com/role/AccruedLiabilitiesTables 56 false false R57.htm 2432415 - Disclosure - Debt and Capital Lease Obligations - Schedule of Debt Obligations (Details) Sheet http://www.quanexbuildingproducts.com/role/DebtandCapitalLeaseObligationsScheduleofDebtObligationsDetails Debt and Capital Lease Obligations - Schedule of Debt Obligations (Details) Details 57 false false R58.htm 2433416 - Disclosure - Debt and Capital Lease Obligations - Narrative (Details) Sheet http://www.quanexbuildingproducts.com/role/DebtandCapitalLeaseObligationsNarrativeDetails Debt and Capital Lease Obligations - Narrative (Details) Details 58 false false R59.htm 2434417 - Disclosure - Debt and Capital Lease Obligations - Schedule of Applicable Margins and Commitment Fees (Details) Sheet http://www.quanexbuildingproducts.com/role/DebtandCapitalLeaseObligationsScheduleofApplicableMarginsandCommitmentFeesDetails Debt and Capital Lease Obligations - Schedule of Applicable Margins and Commitment Fees (Details) Details 59 false false R60.htm 2435418 - Disclosure - Debt and Capital Lease Obligations - Schedule of Debt Maturities (Details) Sheet http://www.quanexbuildingproducts.com/role/DebtandCapitalLeaseObligationsScheduleofDebtMaturitiesDetails Debt and Capital Lease Obligations - Schedule of Debt Maturities (Details) Details 60 false false R61.htm 2438419 - Disclosure - Retirement Plans (Detail) Sheet http://www.quanexbuildingproducts.com/role/RetirementPlansDetail Retirement Plans (Detail) Details http://www.quanexbuildingproducts.com/role/RetirementPlansTables 61 false false R62.htm 2441420 - Disclosure - Income Taxes (Details) Sheet http://www.quanexbuildingproducts.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://www.quanexbuildingproducts.com/role/IncomeTaxTables 62 false false R63.htm 2442421 - Disclosure - Income Taxes - Narrative (Details) Sheet http://www.quanexbuildingproducts.com/role/IncomeTaxesNarrativeDetails Income Taxes - Narrative (Details) Details 63 false false R64.htm 2444422 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.quanexbuildingproducts.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.quanexbuildingproducts.com/role/CommitmentsandContingencies 64 false false R65.htm 2446423 - Disclosure - Fair Value Measurement of Assets and Liabilities (Details) Sheet http://www.quanexbuildingproducts.com/role/FairValueMeasurementofAssetsandLiabilitiesDetails Fair Value Measurement of Assets and Liabilities (Details) Details http://www.quanexbuildingproducts.com/role/FairValueMeasurementofAssetsandLiabilities 65 false false R66.htm 2449424 - Disclosure - Stock Based Compensation (Detail) Sheet http://www.quanexbuildingproducts.com/role/StockBasedCompensationDetail Stock Based Compensation (Detail) Details 66 false false R67.htm 2451425 - Disclosure - Stockholders' Equity (Details) Sheet http://www.quanexbuildingproducts.com/role/StockholdersEquityDetails Stockholders' Equity (Details) Details http://www.quanexbuildingproducts.com/role/StockholdersEquity 67 false false R68.htm 2454426 - Disclosure - Other Income (Expense) (Detail) Sheet http://www.quanexbuildingproducts.com/role/OtherIncomeExpenseDetail Other Income (Expense) (Detail) Details http://www.quanexbuildingproducts.com/role/OtherIncomeExpenseTables 68 false false R69.htm 2457427 - Disclosure - Segment Information (Detail) Sheet http://www.quanexbuildingproducts.com/role/SegmentInformationDetail Segment Information (Detail) Details http://www.quanexbuildingproducts.com/role/SegmentInformationTables 69 false false R70.htm 2460428 - Disclosure - Earnings Per Share (Detail) Sheet http://www.quanexbuildingproducts.com/role/EarningsPerShareDetail Earnings Per Share (Detail) Details http://www.quanexbuildingproducts.com/role/EarningsPerShareTables 70 false false R71.htm 2463429 - Disclosure - Unaudited Quarterly Data (Details) Sheet http://www.quanexbuildingproducts.com/role/UnauditedQuarterlyDataDetails Unaudited Quarterly Data (Details) Details http://www.quanexbuildingproducts.com/role/UnauditedQuarterlyDataTables 71 false false R72.htm 2465430 - Disclosure - Accounting Changes and Error Corrections (Details) Sheet http://www.quanexbuildingproducts.com/role/AccountingChangesandErrorCorrectionsDetails Accounting Changes and Error Corrections (Details) Details 72 false false All Reports Book All Reports nx-20201031.htm nx-20201031.xsd nx-20201031_cal.xml nx-20201031_def.xml nx-20201031_lab.xml nx-20201031_pre.xml nx-exhibit1039.htm nx-exhibit211202010k.htm nx-exhibit231202010k.htm nx-exhibit311202010k.htm nx-exhibit312202010k.htm nx-exhibit32202010k.htm nx-20201031_g1.jpg http://fasb.org/us-gaap/2020-01-31 http://xbrl.sec.gov/country/2020-01-31 http://fasb.org/srt/2020-01-31 http://xbrl.sec.gov/dei/2020-01-31 true true