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OTHER INCOME (EXPENSE)	3 Months Ended
OTHER INCOME (EXPENSE)	Dec. 31, 2020
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) For the quarters ended December 31, 2020 and 2019, Other income (expense) of $(41) and $778, respectively, includes $(699) and ($376), respectively, of net currency exchange losses in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan income of $227 and $389, respectively, as well as $330 and $81, respectively, of net investment income. Additionally, Other income (expense) also includes a one-time technology recognition award for $700 in the quarter ended December 31, 2019.