Components of Basic and Diluted Income Per Share Computation (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Components Of Basic And Diluted Earning Per Share [Line Items]
Net income from continuing operations available to common shareholders	$ 3,420	$ 1,946	$ 7,668	$ 4,101
Basic weighted average shares outstanding	14,622	17,519	14,639	17,498
Dilutive effect of outstanding stock options, non-vested restricted stock, restricted stock units and performance shares	292	113	232	77
Diluted weighted average shares outstanding	14,914	17,632	14,871	17,575