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OTHER INCOME (EXPENSE)	12 Months Ended
OTHER INCOME (EXPENSE)	Sep. 30, 2014
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) Other income (expense) included $220, ($166) and $(1,414) for the years ended September 30, 2014, 2013 and 2012, 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 $110, $565 and $12, respectively, of investment income (loss).