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Information about Restricted Stock Unit Transactions (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Oct. 02, 2010
Units      
Unvested at beginning of year 32    
Granted 10 13 15
Vested (12)    
Forfeited (3)    
Unvested at end of year 27 32  
Weighted Average Grant-Date Fair Value      
Unvested at beginning of year $ 32.34    
Granted $ 39.39    
Vested $ 30.63    
Forfeited $ 32.80    
Unvested at end of year $ 35.49 $ 32.34