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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 25, 2010
Income Taxes      
U.S. Federal Statutory rate (as a percent) 35.00%    
Tax at U.S. Federal Statutory rate $ 201,692 $ 105,961 $ 46,623
Increase (decrease) in rates resulting from:      
Foreign tax rate differential (18,072) (9,289) (589)
Non-deductible stock compensation expense 1,024 1,761 632
State taxes, net of federal benefit 27,114 11,276 5,776
Provincial taxes 10,591 6,309  
Domestic production activities deduction (9,245) (7,831) (3,055)
Acquisition costs   4,158 5,380
Federal tax credits (282) (962)  
Release of capital loss valuation allowance (3,071) (6,194)  
Other 2,890 (3,490) (1,064)
Total tax expense $ 212,641 $ 101,699 $ 53,703