Stockholders' Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	2 Months Ended	3 Months Ended								1 Months Ended	2 Months Ended
	Apr. 01, 2012	Apr. 01, 2012 Stock Options [Member]	Apr. 01, 2012 Employee Stock Purchase Plan [Member]	Apr. 01, 2012 Restricted Stock [Member]		Apr. 01, 2012 Performance Stock Units [Member]	May 16, 2014 Warrants [Member]	Apr. 01, 2012 Warrants [Member]	Dec. 30, 2007 Warrants [Member]	Apr. 18, 2012 Share Repurchase Program [Member]	Apr. 01, 2012 Stockholder Rights Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable (in shares)		6,622,000
Stock options exercisable outstanding weighted average exercise price per share (in dollars per share)		$ 25.26
Weighted average fair value per share (in dollars per share)		$ 13.46
Specified percentage of the fair market value of the common stock on the first or last day of the offering period which is lower at which stock is purchased			85.00%
Total shares issued under ESPP (in shares)			156,000
Weighted average subscription date fair value of shares (in dollars per share)			$ 18.26	$ 50.19		$ 50.47
Total shares available under ESPP (in shares)			15,578,000
Shares outstanding (in shares)								18,322,000	18,322,000
Exercise price of warrants held by hedging counter parties (in dollars per share)								$ 31.435	$ 31.435
Warrant expiration period (in days)							40 days
Stock Repurchase Program, Authorized Amount										$ 250
Stock options granted vesting period (in years)						3 years
Performance Stock Award Issuable, Minimum						50.00%
Performance Stock Award Issuable, Maximum						150.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				541,000	[1]	528,000
Preferred stock, par value (in dollars per share)											$ 0.01
Dividend price per share of Series A Junior Participating Preferred Stock (in dollars per one thousandth of a share)											$ 275.00
Dividend portion of a share of Series A Junior Participating Preferred Stock											0.001
Minimum percent ownership of outstanding common stock required to exercise rights											15.00%
Price per right Board of Directors are entitled to redeem rights (in dollars per share)											$ 0.001
Dividend number of preferred share purchase rights for each outstanding share of common stock (in shares)				1
Number of units each right entitles (in shares)											1
Minimum percent ownership of outstanding common stock required prior to exchange by board of directors	15.00%
Maximum percent ownership of outstanding common stock required prior to exchange by board of directors	50.00%

[1] The fair value of each restricted stock unit represents the fair market value of one share of the Company’s common stock.