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, 2016	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income from continuing operations available to common shareholders	$ 9,985	$ 11,947	$ 12,207
Basic weighted average shares outstanding	12,998	13,029	13,632
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units and performance shares	221	260	244
Diluted weighted average shares outstanding	13,219	13,289	13,876