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Summary of Significant Accounting Policies and Select Balance Sheet Information - Denominator for Computation of Basic and Diluted Income Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income from continuing operations available to common shareholders	$ 2,444	$ 3,674	$ 2,459	$ 3,630	$ 3,733	$ 3,178	$ 3,420	$ 4,248	$ 12,207	$ 14,579	$ 10,129
Basic weighted average shares outstanding									13,632	14,464	17,318
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units and performance shares									244	267	113
Diluted weighted average shares outstanding									13,876	14,731	17,431

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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