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Information about Stock Options Vested and Expected to Vest (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Vested 26
Number of Options, Expected to vest 24 [1]
$ 0 - $20
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 0
Range of Exercise Prices, Upper Range $ 20
Number of Options, Vested 2
Weighted Average Exercise Price, Vested $ 18.07
Weighted Average Remaining Years of Contractual Life, Vested 2 years 1 month 6 days
$21 - $25
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 21
Range of Exercise Prices, Upper Range $ 25
Number of Options, Vested 5
Weighted Average Exercise Price, Vested $ 22.72
Weighted Average Remaining Years of Contractual Life, Vested 2 years 2 months 12 days
$26 - $30
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 26
Range of Exercise Prices, Upper Range $ 30
Number of Options, Vested 10
Weighted Average Exercise Price, Vested $ 28.99
Weighted Average Remaining Years of Contractual Life, Vested 2 years 7 months 6 days
$31 - $35
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 31
Range of Exercise Prices, Upper Range $ 35
Number of Options, Vested 8
Weighted Average Exercise Price, Vested $ 33.17
Weighted Average Remaining Years of Contractual Life, Vested 3 years 1 month 6 days
$36 - $45
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 36
Range of Exercise Prices, Upper Range $ 45
Number of Options, Vested 1
Weighted Average Exercise Price, Vested $ 39.63
Weighted Average Remaining Years of Contractual Life, Vested 8 years 3 months 18 days
$0 - $25
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 0
Range of Exercise Prices, Upper Range $ 25
Number of Options, Expected to vest 2 [1]
Weighted Average Exercise Price, Expected to vest $ 20.78
Weighted Average Remaining Years of Contractual Life, Expected to vest 3 years 3 months 18 days
$26 - $30
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 26
Range of Exercise Prices, Upper Range $ 30
Number of Options, Expected to vest 3 [1]
Weighted Average Exercise Price, Expected to vest $ 28.61
Weighted Average Remaining Years of Contractual Life, Expected to vest 3 years 1 month 6 days
$31 - $35
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 31
Range of Exercise Prices, Upper Range $ 35
Number of Options, Expected to vest 4 [1]
Weighted Average Exercise Price, Expected to vest $ 31.18
Weighted Average Remaining Years of Contractual Life, Expected to vest 7 years 3 months 18 days
$36 - $40
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 36
Range of Exercise Prices, Upper Range $ 40
Number of Options, Expected to vest 14 [1]
Weighted Average Exercise Price, Expected to vest $ 39.12
Weighted Average Remaining Years of Contractual Life, Expected to vest 8 years 10 months 24 days
$41 - $50
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, Lower Range $ 41
Range of Exercise Prices, Upper Range $ 50
Number of Options, Expected to vest 1 [1]
Weighted Average Exercise Price, Expected to vest $ 46.28
Weighted Average Remaining Years of Contractual Life, Expected to vest 9 years 7 months 6 days
[1] Number of options expected to vest is total unvested options less estimated forfeitures.