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, 2017	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income from continuing operations available to common shareholders	$ 3,926	$ 9,985	$ 11,947
Basic weighted average shares outstanding	13,153	12,998	13,029
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units and performance shares	236	221	260
Diluted weighted average shares outstanding	13,389	13,219	13,289