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SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Sep. 30, 2018
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On November 14, 2018, the Board of Directors declared a cash dividend of $0.0725 per share, payable on December 20, 2018 to shareholders of record as of the close of business on November 29, 2018. Griffon currently intends to pay dividends each quarter; however, payment of dividends is determined by the Board of Directors, at its discretion, based on various factors, and no assurance can be provided as to the payment of future dividends. *****