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BUSINESS SEGMENTS (Details) - Summary of Segment Assets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Segment assets:    
Continuing Assets $ 1,743,369gff_AssetsOfContinuingOperations $ 1,802,811gff_AssetsOfContinuingOperations
Assets of discontinued operations 3,884us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation 3,750us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Total Assets 1,747,253us-gaap_Assets 1,806,561us-gaap_Assets
Home And Building Products [Member]    
Segment assets:    
Continuing Assets 1,091,443gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= gff_HomeAndBuildingProductsMember		 1,030,005gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= gff_HomeAndBuildingProductsMember
Telephonics [Member]    
Segment assets:    
Continuing Assets 291,535gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= gff_TelephonicsMember		 319,327gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= gff_TelephonicsMember
Plastics [Member]    
Segment assets:    
Continuing Assets 354,150gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= gff_PlasticsMember		 389,464gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= gff_PlasticsMember
Operating Segments [Member]    
Segment assets:    
Continuing Assets 1,737,128gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 1,738,796gff_AssetsOfContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Corporate, Non-Segment [Member]    
Segment assets:    
Continuing Assets $ 6,241gff_AssetsOfContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 $ 64,015gff_AssetsOfContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember