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OTHER INCOME (EXPENSE)	12 Months Ended
OTHER INCOME (EXPENSE)	Sep. 30, 2019
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) Other income (expense) included $608, ($200) and $(723) for 2019, 2018 and 2017, respectively, of 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, as well as $(40), $1,184 and $53, respectively, of investment income.