Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net income (loss)	$ 2,496	$ (101)	$ 3,603	$ 1,325
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding	24,938,000	25,274,000	24,525,000	25,545,000
Effect of dilutive securities:
Stock options and restricted stock units	772,000	0	560,000	420,000
Denominator for diluted net income per common share — adjusted weighted average shares	25,710,000	25,274,000	25,085,000	25,965,000
Net income per common share, basic (USD per share)	$ 0.10	$ 0.00	$ 0.15	$ 0.05
Net income per common share, diluted (USD per share)	$ 0.10	$ 0.00	$ 0.14	$ 0.05
Potentially dilutive securities excluded from computation of earnings per share	2,416,518	4,979,372	3,451,827	3,399,013