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OTHER INCOME (EXPENSE)	12 Months Ended
OTHER INCOME (EXPENSE)	Sep. 30, 2016
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) Other income (expense) included $770, $286 and $220 for the years ended September 30, 2016, 2015 and 2014, 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 $316, $424 and $110, respectively, of investment income.