COMMITMENTS AND CONTINGENCIES (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Net Capital Cost Value	$ 5,000
Net Capital Cost Value In Proposed Remedial Action Plan	$ 10,000

Amount of net capital cost value in Proposed Remedial Action Plan as of the reporting date.

No definition available.

Name:	gff_NetCapitalCostValueInProposedRemedialActionPlan
Namespace Prefix:	gff_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant