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OTHER INCOME (EXPENSE)	12 Months Ended
OTHER INCOME (EXPENSE)	Sep. 30, 2015
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) Other income (expense) included $286, $220 and $(166) for the years ended September 30, 2015, 2014 and 2013, 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 $424, $110 and $565, respectively, of investment income.