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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 2,459	$ 1,466	$ 4,069	$ 4,038
Basic weighted average shares outstanding	13,601	13,394	13,577	13,384
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units, deferred stock units and performance shares	185	332	198	392
Diluted weighted average shares outstanding	13,786	13,726	13,775	13,776