CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts,receivable current	$ 4,371	$ 4,226
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	64,854,000	65,223,000
Common stock, shares issued	64,854,000	65,223,000