CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2012	$ 104,972	$ 134	$ 95,086	$ 9,786	$ (34)
Beginning Balance, shares at Sep. 30, 2012		13,370
Net income	9,719			9,719
Foreign currency translation adjustments	(7)				(7)
Cash dividends	(4,725)			(4,725)
Stock-based compensation	1,496	1	1,495
Stock-based compensation, shares		102
Exercise of stock options, net	492	1	491
Exercise of stock options, shares		93
Excess tax benefit from stock option exercises and restricted stock vesting	576		576
Repurchase and retirement of common stock	(615)	(1)	(614)
Repurchase and retirement of common stock, shares		(30)
Ending Balance at Mar. 31, 2013	111,908	135	97,034	14,780	(41)
Ending Balance, shares at Mar. 31, 2013		13,535
Beginning Balance at Sep. 30, 2013	122,633	136	98,634	23,930	(67)
Beginning Balance, shares at Sep. 30, 2013		13,556
Net income	7,506			7,506
Foreign currency translation adjustments	7				7
Cash dividends	(5,305)			(5,305)
Stock-based compensation	1,849	1	1,848
Stock-based compensation, shares		98
Exercise of stock options, net	211	1	210
Exercise of stock options, shares		113
Excess tax benefit from stock option exercises and restricted stock vesting	1,321		1,321
Repurchase and retirement of common stock	(1,795)	(1)	(1,794)
Repurchase and retirement of common stock, shares		(57)
Ending Balance at Mar. 31, 2014	$ 126,427	$ 137	$ 100,219	$ 26,131	$ (60)
Ending Balance, shares at Mar. 31, 2014		13,710