Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Consolidated Balance Sheets [Abstract]
Trade, allowance	$ 729	$ 736
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	22,049,529	22,049,529
Common stock, shares outstanding	21,434,086	21,456,539
Treasury stock, shares	615,443	592,990