Summary of Significant Accounting Policies and Select Balance Sheet Information - Denominator for Computation of Basic and Diluted Income Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 7,592	$ (4,457)	$ 3,926
Basic weighted average shares outstanding	13,389	13,157	13,153
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units and performance shares	390		236
Diluted weighted average shares outstanding	13,779	13,157	13,389