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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Changes in uncertain tax positions    
Balance at the beginning of the period $ 0 $ 377
Effect of tax positions taken in prior years 0 0
Accrued interest related to tax positions taken 0 11
Settlements 0 (10)
Lapse of statute 0 (369)
Translation adjustments 0 (9)
Balance at the end of the period $ 0 $ 0