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OTHER INCOME (EXPENSE)	3 Months Ended
OTHER INCOME (EXPENSE)	Dec. 31, 2018
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) For the quarters ended December 31, 2018 and 2017, Other income (expense) includes $502 and ($437), 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 as well as $(77) and $(5), respectively, of net investment income (loss). Additionally, during the quarters ended December 31, 2018 and 2017, Other income (expense) included net periodic benefit income of $787 and $882, respectively. Effective October 1, 2018, these benefits amounts are required to be included in other income; in the past these were in Selling, general and administrative expenses, as a result of implementation of the new accounting standard on pensions. All periods have been restated. See Note 13 - Employee Benefit Plans for further information on the implementation of this guidance.