Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Sep. 30, 2010	$ 114,597,000	$ 335,000	$ 89,598,000	$ (50,128,000)	$ 75,432,000	$ (640,000)
Beginning Balance, Common Stock, Shares at Sep. 30, 2010		33,521,591
Beginning Balance, Treasury Stock, Shares at Sep. 30, 2010				5,895,617
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, shares		1,036,440
Exercise of stock options	3,944,000	11,000	3,933,000
Purchase of treasury stock, shares				1,824,040
Purchase of treasury stock	(10,036,000)			(10,036,000)
Tax benefit of stock options exercised	0		0
Share-based compensation expense	1,532,000		1,532,000
Net income	5,677,000				5,677,000
Foreign Currency translation adjustments	188,000					188,000
Ending Balance at Sep. 30, 2011	115,902,000	346,000	95,063,000	(60,164,000)	81,109,000	(452,000)
Ending Balance, Common Stock, Shares at Sep. 30, 2011		34,558,031
Ending Balance, Treasury Stock, Shares at Sep. 30, 2011				7,719,657
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, shares	1,737,996	1,737,996
Exercise of stock options	8,732,000	17,000	8,715,000
Purchase of treasury stock, shares				392,821
Purchase of treasury stock	(1,884,000)			(1,884,000)
Long-term incentive program	651,000		651,000
Tax benefit of stock options exercised	555,000		555,000
Share-based compensation expense	2,767,000		2,767,000
Net income	28,174,000				28,174,000
Foreign Currency translation adjustments	123,000
Ending Balance at Sep. 30, 2012	155,020,000	363,000	107,751,000	(62,048,000)	109,283,000	(329,000)
Ending Balance, Common Stock, Shares at Sep. 30, 2012	28,183,549	36,296,027
Ending Balance, Treasury Stock, Shares at Sep. 30, 2012	8,112,478			8,112,478
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, shares	1,427,673	1,506,923
Exercise of stock options	9,176,000	15,000	9,161,000
Purchase of treasury stock, shares				303,602
Purchase of treasury stock	(4,838,000)			(4,838,000)
Long-term incentive program	478,000		478,000
Tax benefit of stock options exercised	10,394,000		10,394,000
Share-based compensation expense	3,448,000		3,448,000
Net income	34,934,000				34,934,000
Foreign Currency translation adjustments	329,000					329,000
Ending Balance at Sep. 30, 2013	$ 208,941,000	$ 378,000	$ 131,232,000	$ (66,886,000)	$ 144,217,000	$ 0
Ending Balance, Common Stock, Shares at Sep. 30, 2013	29,386,870	37,802,950
Ending Balance, Treasury Stock, Shares at Sep. 30, 2013	8,416,080			8,416,080