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Stock-Based Compensation Plans (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Dec. 31, 2011
Apr. 02, 2011
Summary of restricted stock unit activity and related information    
Number of Shares, Beginning balance 4,215 3,652
Number of Shares, Granted 2,243 2,043
Number of Shares, Vested (1,237) (1,192)
Number of Shares, Cancelled (331) (288)
Number of Shares, Ending balance 4,890 4,215
Weighted-Average Grant-Date Fair Value, Beginning balance $ 23.19 $ 21.70
Weighted-Average Grant-Date Fair Value, Granted $ 33.89 $ 25.14
Weighted-Average Grant-Date Fair Value, Vested $ 23.00 $ 22.23
Weighted-Average Grant-Date Fair Value, Cancelled $ 24.65 $ 21.99
Weighted-Average Grant-Date Fair Value, Ending balance $ 28.04 $ 23.19