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RELATED PARTIES	12 Months Ended
RELATED PARTIES	Sep. 30, 2020
Related Party Transactions [Abstract]
RELATED PARTIES	RELATED PARTIES On September 5, 2017, Griffon entered into an engagement letter with Goldman Sachs & Co. ("Goldman Sachs") pursuant to which Goldman Sachs agreed to act as Griffon’s financial advisor in connection with the exploration of strategic alternatives for Plastics. On November 15, 2017, Griffon signed an agreement to sell Plastics for approximately $465,000 to Berry. Under the terms of the engagement letter, upon the closing of the transaction a customary advisory fee was paid by Griffon to Goldman Sachs. Goldman Sachs acted as a joint lead manager and as an initial purchaser in connection with Griffon’s add-on offering of $275,000 aggregate principal amount of 5.25% senior notes due 2022 that closed on October 2, 2017, and received a customary fee upon closing of the offering. On June 19, 2018, GS Direct completed an underwritten secondary offering to sell 5,583,375 shares of Griffon's common stock, inclusive of the underwriters' 30-day option to purchase additional shares. GS Direct's initial 10,000,000 share investment was in 2008; following the closing of the offering, GS Direct no longer owns any shares of Griffon.