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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 720	$ 3,934	$ 3,526	$ 7,408
Basic weighted average shares outstanding	13,155	12,995	13,190	12,969
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units, deferred stock units and performance shares	230	289	214	234
Diluted weighted average shares outstanding	13,385	13,284	13,404	13,203