CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
BALANCE at Mar. 31, 2010	$ 269,426	$ 112	$ 166,094	$ 101,894	$ 1,326
BALANCE (in shares) at Mar. 31, 2010		11,211,000
Increase (Decrease) in Shareholders' Equity
Net income	41,412			41,412
Other comprehensive income (loss) - currency translation adjustment, net of tax	1,388				1,388
Exercise of stock options, including tax benefit	9,594	4	9,590
Exercise of stock options, including tax benefit (in shares)		417,000
Repurchase and retirement of common stock	(27,766)	(6)	(8,444)	(19,316)
Repurchase and retirement of common stock (in shares)		(556,000)
Share-based compensation expense	3,307		3,307
BALANCE at Mar. 31, 2011	297,361	110	170,547	123,990	2,714
BALANCE (in shares) at Mar. 31, 2011		11,072,000
Increase (Decrease) in Shareholders' Equity
Net income	14,102			14,102
Other comprehensive income (loss) - currency translation adjustment, net of tax	(861)				(861)
Exercise of stock options, including tax benefit	4,251	2	4,249
Exercise of stock options, including tax benefit (in shares)		191,000
Repurchase and retirement of common stock	(43,802)	(10)	(15,532)	(28,260)
Repurchase and retirement of common stock (in shares)		(1,023,000)
Share-based compensation expense	2,650		2,650
BALANCE at Mar. 31, 2012	273,701	102	161,914	109,832	1,853
BALANCE (in shares) at Mar. 31, 2012	10,239,819	10,240,000
Increase (Decrease) in Shareholders' Equity
Net income	22,225			22,225
Other comprehensive income (loss) - currency translation adjustment, net of tax	(2,371)				(2,371)
Exercise of stock options, including tax benefit	1,406	1	1,405
Exercise of stock options, including tax benefit (in shares)		83,000
Repurchase and retirement of common stock	(18,912)	(7)	(10,987)	(7,918)
Repurchase and retirement of common stock (in shares)		(690,000)
Share-based compensation expense	2,325		2,325
BALANCE at Mar. 31, 2013	$ 278,374	$ 96	$ 154,657	$ 124,139	$ (518)
BALANCE (in shares) at Mar. 31, 2013	9,633,475	9,633,000