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Income Taxes (Schedule of Income Tax Expense and Related Effective Rate) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 02, 2011
Jul. 03, 2010
Jul. 02, 2011
Jul. 03, 2010
Income Taxes        
Income tax expense $ 27,657 $ 7,965 $ 58,850 $ 24,008
Income tax rate 33.90% 12.30% 34.40% 20.30%