Net Income Per Share Data - Denominator for Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 4,003	$ 3,924	$ 7,341	$ 10,590
Basic weighted average shares outstanding	12,995	13,002	12,969	13,057
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units, deferred stock units and performance shares	289	277	234	267
Diluted weighted average shares outstanding	13,284	13,279	13,203	13,324