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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 3,507 $ 6,843
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares outstanding 64,248,000 65,137,000
Common stock, shares issued 64,248,000 65,137,000