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SUBSEQUENT EVENTS (Details) | Nov. 14, 2018 $ / shares
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Subsequent Event [Member] |
SUBSEQUENT EVENTS (Details) [Line Items] |
Dividends payable, amount per share (in Dollars per share) | $ 0.0725

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

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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_DividendsPayableAmountPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
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