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DISCONTINUED OPERATIONS - Narrative (Details) - Discontinued Operations - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, insurance claims, warranty and environmental reserves	$ 9,137		$ 7,768
Revenue from disposed business	$ 0	$ 0

X

- Definition

Disposal Group, Including Discontinued Operation, Insurance Claims, Warranty And Environmental Reserves

+ References

No definition available.

+ Details

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Namespace Prefix:	gff_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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