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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | Jun. 30, 2011 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Net capital cost value in proposed remedial action plan | $ 10,000

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- Definition Amount of net capital cost value in Proposed Remedial Action Plan as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | gff_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration