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INCOME TAXES - Unrecognized tax benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
INCOME TAXES    
Accrued interest and penalties related to unrecognized tax benefits $ 2,200 $ 2,800
Reconciliation of the change in gross unrecognized tax benefits    
Unrecognized tax benefits at the beginning of the period 4,773 9,551
Gross increases - tax positions in prior periods 3  
Gross decreases - tax positions in prior periods   (1)
Gross decreases - current period effect of tax positions (280) (170)
Gross increases - current period effect of tax positions 10,537 300
Expiration of statute of limitations for assessments (128) (4,907)
Unrecognized tax benefits at the end of the period 14,905 4,773
Unrecognized tax benefits related to discontinued operations $ 14,300 $ 3,700