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Employee Benefit Plan (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Oct. 01, 2011
Oct. 02, 2010
Oct. 01, 2011
Oct. 02, 2010
Employee Benefit Plan    
Profit Sharing and Retirement Savings Plan expense$ 26.4$ 3.4$ 97.5$ 24.3