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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Statement Of Financial Position [Abstract]    
Property and equipment, accumulated depreciation $ 59,682 $ 56,282
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 25,682,502 25,562,994
Common stock, shares outstanding 24,115,486 24,199,661
Treasury stock, at cost 1,567,016 1,363,333