CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Intercompany Debt Agreement Borrowed Loan Amount	$ 491,372

Amount of loan borrowed from inter-company debt agreement made with a non-guarantor.

No definition available.

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