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ACQUISITION (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2012
Business Acquisition Revenue Exceeding	$ 40,000

X

- Definition

Amount of business acquisition revenue exceeding.

+ References

No definition available.

+ Details

Name:	gff_BusinessAcquisitionRevenueExceeding
Namespace Prefix:	gff_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration