Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Treasury Stock	Additional Paid in Capital	Accumulated Deficit	Accumulated Other Comprehensive (Loss) Income
Beginning Balance at Mar. 31, 2012	$ 126,297	$ 393	$ (827)	$ 401,771	$ (273,275)	$ (1,765)
Beginning Balance (in shares) at Mar. 31, 2012		39,272,754	50,954
Restricted stock issued (in shares)		91,503
Restricted stock issued		1		(1)
Stock options exercised (in shares)		337,212
Stock options exercised	2,936	3		2,933
Stock issued under employee stock purchase plan (in shares)		33,132
Stock issued under employee stock purchase plan	555			555
Stock issued to directors (in shares)		2,828
Stock issued to directors	51			51
Repurchase of common stock (in shares)		(1,123,587)	1,123,587
Repurchase of common stock	(15,045)		(15,045)
Return of common stock to pay withholding taxes on restricted stock (in shares)		(12,458)	12,458
Return of common stock to pay withholding taxes on restricted stock	(257)		(257)
Stock compensation expense	9,501			9,501
Other comprehensive income (loss)	(1,972)					(1,972)
Net income	15,014				15,014
Ending Balance at Mar. 31, 2013	137,080	397	(16,129)	414,810	(258,261)	(3,737)
Ending Balance (in shares) at Mar. 31, 2013		38,601,384	1,186,999
Restricted stock issued (in shares)		254,991
Restricted stock issued		3		(3)
Stock options exercised (in shares)		1,029,024
Stock options exercised	9,360	11		9,349
Stock issued under employee stock purchase plan (in shares)		43,779
Stock issued under employee stock purchase plan	697			697
Stock issued to directors (in shares)		6,518
Stock issued to directors	65			65
Return of common stock to pay withholding taxes on restricted stock (in shares)		(19,368)	19,368
Return of common stock to pay withholding taxes on restricted stock	(425)		(425)
Stock compensation expense	11,218			11,218
Other comprehensive income (loss)	3,007					3,007
Net income	7,351				7,351
Ending Balance at Mar. 31, 2014	168,353	411	(16,554)	436,136	(250,910)	(730)
Ending Balance (in shares) at Mar. 31, 2014		39,916,328	1,206,367
Restricted stock issued (in shares)		543,420
Restricted stock issued		5		(5)
Stock options exercised (in shares)	911,000	911,553
Stock options exercised	10,927	9		10,918
Stock issued under employee stock purchase plan (in shares)		39,095
Stock issued under employee stock purchase plan	795			795
Stock issued to directors (in shares)		1,954
Stock issued to directors	76			76
Return of common stock to pay withholding taxes on restricted stock (in shares)		(76,577)	76,577
Return of common stock to pay withholding taxes on restricted stock	(2,805)	(12)	(2,793)
Stock compensation expense	16,520			16,520
Excess tax benefit from stock-based awards	606			606
Other comprehensive income (loss)	(16,600)					(16,600)
Net income	113,688				113,688
Ending Balance at Mar. 31, 2015	$ 291,560	$ 413	$ (19,347)	$ 465,046	$ (137,222)	$ (17,330)
Ending Balance (in shares) at Mar. 31, 2015		41,335,773	1,282,944