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| | | <ShortName> OTHER INCOME (EXPENSE) (Details) </ShortName> |
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| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
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| | | <Role> http://griffoncorp.com/role/OtherComprehensiveIncomeLossDetailsSummaryOfOtherComprehensiveIncome </Role> |
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| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/OtherComprehensiveIncomeLossDetailsAccumulatedOtherComprehensiveIncome </Role> |
| | | <ShortName> OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Accumulated Other Comprehensive Income </ShortName> |
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| | | <ParentRole> http://griffoncorp.com/role/OtherComprehensiveIncomeLossTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/OtherComprehensiveIncomeLossDetailsTotalComprehensiveIncomeLoss </Role> |
| | | <ShortName> OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Total Comprehensive Income (Loss) </ShortName> |
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| | | <ParentRole> http://griffoncorp.com/role/OtherComprehensiveIncomeLossTables </ParentRole> |
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| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/OtherComprehensiveIncomeLossDetailsSummaryOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome </Role> |
| | | <ShortName> OTHER COMPREHENSIVE INCOME (LOSS) (Details) - Summary of Amounts Reclassified from Accumulated Other Comprehensive Income </ShortName> |
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| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/ConsolidatingGuarantorAndNonGuarantorFinancialInformationDetails </Role> |
| | | <ShortName> CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) </ShortName> |
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| | | <LongName> 2421403 - Disclosure - CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated balance sheets </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/ConsolidatingGuarantorAndNonGuarantorFinancialInformationDetailsSummaryOfConsolidatedBalanceSheets </Role> |
| | | <ShortName> CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated balance sheets </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://griffoncorp.com/role/ConsolidatingGuarantorAndNonGuarantorFinancialInformationTables </ParentRole> |
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| | | <LongName> 2421404 - Disclosure - CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated statement of operations and comprehensive income </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/ConsolidatingGuarantorAndNonGuarantorFinancialInformationDetailsSummaryOfConsolidatedStatementOfOperationsAndComprehensiveIncome </Role> |
| | | <ShortName> CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated statement of operations and comprehensive income </ShortName> |
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| | | <ParentRole> http://griffoncorp.com/role/ConsolidatingGuarantorAndNonGuarantorFinancialInformationTables </ParentRole> |
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| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
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| | | <LongName> 2421405 - Disclosure - CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated cash flows </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/ConsolidatingGuarantorAndNonGuarantorFinancialInformationDetailsSummaryOfConsolidatedCashFlows </Role> |
| | | <ShortName> CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Details) - Summary of consolidated cash flows </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://griffoncorp.com/role/ConsolidatingGuarantorAndNonGuarantorFinancialInformationTables </ParentRole> |
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| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
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| | | <LongName> 2422401 - Disclosure - SUBSEQUENT EVENTS (Details) </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/SubsequentEventsDetails </Role> |
| | | <ShortName> SUBSEQUENT EVENTS (Details) </ShortName> |
| | | <MenuCategory> Details </MenuCategory> |
| | | <ParentRole> http://griffoncorp.com/role/SubsequentEvents </ParentRole> |
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| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
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| | | <LongName> 2423401 - Disclosure - SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts </LongName> |
| | | <ReportType> Sheet </ReportType> |
| | | <Role> http://griffoncorp.com/role/ScheduleIiValuationAndQualifyingAccountsDetailsScheduleOfValuationAndQualifyingAccounts </Role> |
| | | <ShortName> SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - Schedule of Valuation and Qualifying Accounts </ShortName> |
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| | | <ParentRole> http://griffoncorp.com/role/ScheduleIiValuationAndQualifyingAccounts </ParentRole> |
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| | <Report> |
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| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <LongName> All Reports </LongName> |
| | | <ReportType> Book </ReportType> |
| | | <ShortName> All Reports </ShortName> |
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| | </MyReports> |
| <Logs> |
| | <Log type="Info"> In ''CONSOLIDATED BALANCE SHEETS'', column(s) 3, 4 are contained in other reports, so were removed by flow through suppression. </Log> |
| | <Log type="Info"> In ''CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)'', column(s) 1, 3, 5, 7, 9, 11, 13, 15 are contained in other reports, so were removed by flow through suppression. </Log> |
| | <Log type="Info"> In ''CONSOLIDATED STATEMENTS OF CASH FLOWS'', column(s) 1, 2, 3, 4, 5, 6, 7, 8 are contained in other reports, so were removed by flow through suppression. </Log> |
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| | <File> gff-20150930_lab.xml </File> |
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| | <File> gff-20150930.xsd </File> |
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