CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Treasury Stock
Stockholders' Equity at Mar. 31, 2008	$ 578,620	$ 673	$ 369,655	$ (3,581)	$ 608,849	$ (396,976)
Common Stock, Shares, Outstanding at Mar. 31, 2008		48,944
Net income (loss)	(64,899)				(64,899)
Foreign currency translation adjustments	(2,606)			(2,606)
Unrealized gain (loss) on hedges, net of tax	12,179			12,179
Unrealized gain on investments, net of tax	2,863			2,863
Comprehensive income (loss)	(52,463)
Exercise of stock options (shares)		359
Exercise of stock options	6,898	4	6,894
Issuance of restricted common stock (shares)		187
Issuance of restricted common stock	1	1
Repurchase of restricted common stock (shares)		(20)
Repurchase of restricted common stock	0	0
Cash dividends declared	(9,787)				(9,787)
Stock-based compensation	15,742		15,742
Income tax benefit associated with stock options	(1,025)		(1,025)
Repurchase of common stock including taxes paid related to net share settlement on equity awards (shares)		(1,007)
Repurchase of common stock including taxes paid related to net share settlement on equity awards	(17,817)					(17,817)
Sale of treasury stock (shares)		429
Sale of treasury stock	5,198		(5,042)			10,240
Retirement of treasury stock					(330,227)	330,227
Stockholders' Equity at Mar. 31, 2009	525,367	678	386,224	8,855	203,936	(74,326)
Common Stock, Shares, Outstanding at Mar. 31, 2009		48,892
Net income (loss)	57,378				57,378
Foreign currency translation adjustments	1,047			1,047
Unrealized gain (loss) on hedges, net of tax	(3,630)			(3,630)
Comprehensive income (loss)	54,795
Exercise of stock options (shares)		1,493
Exercise of stock options	32,579	15	32,564
Issuance of restricted common stock (shares)		154
Issuance of restricted common stock	2	2
Repurchase of restricted common stock (shares)		(18)
Repurchase of restricted common stock	0	0
Cash dividends declared	(9,781)				(9,781)
Stock-based compensation	14,877		14,877
Income tax benefit associated with stock options	(476)		(476)
Repurchase of common stock including taxes paid related to net share settlement on equity awards (shares)		(1,935)
Repurchase of common stock including taxes paid related to net share settlement on equity awards	(49,652)					(49,652)
Sale of treasury stock (shares)		284
Sale of treasury stock	3,623		(4,782)			8,405
Retirement of treasury stock					(56,240)	56,240
Stockholders' Equity at Mar. 31, 2010	571,334	695	428,407	6,272	195,293	(59,333)
Common Stock, Shares, Outstanding at Mar. 31, 2010		48,870
Net income (loss)	109,243				109,243
Foreign currency translation adjustments	1,613			1,613
Unrealized gain (loss) on hedges, net of tax	(6,419)			(6,419)
Unrealized gain on investments, net of tax	7			7
Comprehensive income (loss)	104,444
Exercise of stock options (shares)		2,196
Exercise of stock options	50,106	22	50,084
Issuance of restricted common stock (shares)		424
Issuance of restricted common stock	3	3
Repurchase of restricted common stock (shares)		(26)
Repurchase of restricted common stock	0	0
Cash dividends declared	(9,703)				(9,703)
Stock-based compensation	15,873		15,873
Income tax benefit associated with stock options	4,319		4,319
Repurchase of common stock including taxes paid related to net share settlement on equity awards (shares)		(3,321)
Repurchase of common stock including taxes paid related to net share settlement on equity awards	(105,716)					(105,716)
Sale of treasury stock (shares)		172
Sale of treasury stock	4,192		344			3,848
Retirement of treasury stock					(102,365)	102,365
Stockholders' Equity at Mar. 31, 2011	$ 634,852	$ 720	$ 499,027	$ 1,473	$ 192,468	$ (58,836)
Common Stock, Shares, Outstanding at Mar. 31, 2011		48,315