Net Income (Loss) Per Share Data - Denominator for Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 1,466	$ (2,682)	$ 4,038	$ (2,704)
Basic weighted average shares outstanding	13,394	13,203	13,384	13,117
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units, deferred stock units and performance shares	332		392
Diluted weighted average shares outstanding	13,726	13,203	13,776	13,117