Summary of Significant Accounting Policies and Select Balance Sheet Information - Components of Basic and Diluted Income Per Share Computation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share [Abstract]
Net income from continuing operations available to common shareholders	$ 2,854	$ 3,174	$ 1,946	$ 2,155	$ 3,733	$ 3,178	$ 3,420	$ 4,248	$ 14,579	$ 10,129	$ 10,925
Basic weighted average shares outstanding									14,464	17,318	17,419
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units and performance shares									267	113	43
Diluted weighted average shares outstanding									14,731	17,431	17,462