Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts of $5,775 and $5,371, respectively	$ 5,775	$ 5,371
Common stock, par value (in dollars per share)	$ 0.25	$ 0.25
Common stock, shares authorized (in shares)	64,000,000	64,000,000
Common stock, shares issued (in shares)	17,792,000	17,760,000
Common stock, shares outstanding (in shares)	17,792,000	17,760,000