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ACQUISITIONS (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
May 21, 2014
Mar. 31, 2014
Business Acquisition [Line Items]        
Payments to acquire businesses, net of cash acquired $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 22,781us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired    
Guarantor Companies [Member]        
Business Acquisition [Line Items]        
Payments to acquire businesses, net of cash acquired   1,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Cyclone [Member]        
Business Acquisition [Line Items]        
Business combination, consideration transferred     40,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= gff_CycloneMember
 
Business combination, working capital adjustment     4,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= gff_CycloneMember
 
Business acquisition, transaction costs     2,363us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= gff_CycloneMember
 
Northcote Pottery [Member] | Guarantor Companies [Member]        
Business Acquisition [Line Items]        
Payments to acquire businesses, net of cash acquired       22,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= gff_NorthcotePotteryMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Business acquisition, transaction costs   $ 798us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= gff_NorthcotePotteryMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
  $ 798us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= gff_NorthcotePotteryMember
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember