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	18,310			18,310
Foreign currency translation adjustments	(24)				(24)
Cash dividends	(7,263)			(7,263)
Stock-based compensation	2,000	1	1,999
Stock-based compensation, shares		100
Exercise of stock options, net	549	1	548
Exercise of stock options, shares		99
Excess tax benefit from stock option exercises and restricted stock vesting	598		598
Repurchase and retirement of common stock	(633)	(1)	(632)
Repurchase and retirement of common stock, shares		(31)
Ending Balance at Jun. 30, 2013	118,509	135	97,599	20,833	(58)
Ending Balance, shares at Jun. 30, 2013		13,538
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	12,982			12,982
Foreign currency translation adjustments	7				7
Cash dividends	(8,040)			(8,040)
Stock-based compensation	2,680	1	2,679
Stock-based compensation, shares		92
Exercise of stock options, net	215	1	214
Exercise of stock options, shares		114
Excess tax benefit from stock option exercises and restricted stock vesting	1,325		1,325
Repurchase and retirement of common stock	(1,809)	(1)	(1,808)
Repurchase and retirement of common stock, shares		(58)
Ending Balance at Jun. 30, 2014	$ 129,993	$ 137	$ 101,044	$ 28,872	$ (60)
Ending Balance, shares at Jun. 30, 2014		13,704