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OTHER INCOME (EXPENSE)	6 Months Ended
OTHER INCOME (EXPENSE)	Mar. 31, 2020
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) For the quarters ended March 31, 2020 and 2019, Other income (expense) includes $745 and ($118), respectively, of net currency exchange gains (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 $389 and $787, respectively, as well as $(230) and $108, respectively, of net investment (loss) income. For the six months ended March 31, 2020 and 2019, Other income (expense) includes $369 and $384, respectively, of net currency exchange gains (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 $778 and 1,574, respectively, as well as $(149) and $31, respectively, of net investment (loss) income. During the six months ended March 31, 2020, Other income (expense) also includes a one-time contract award of $700.