Employee Stock Plans - Options Outstanding and Exercisable Under Employee Stock Plans (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number of Shares (in shares)	2,537	3,343	4,485	6,459
Weighted Average Remaining Contractual Term (in years)	4 years 26 days
Weighted Average Exercise Price (in dollars per share)	$ 72.58	$ 60.53	$ 53.02	$ 48.34
Aggregate Intrinsic Value	$ 22,279
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of Shares (in shares)	1,596	2,486
Weighted Average Remaining Contractual Term (in years)	2 years 11 months 13 days
Weighted Average Exercise Price (in dollars per share)	$ 62.97	$ 54.21
Aggregate Intrinsic Value	$ 22,085
Closing price (in dollars per share)	$ 75.19
$37.06 – $39.85
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of Exercise Prices, Lower (in dollars per share)	37.06
Range of Exercise Prices, Upper (in dollars per share)	$ 39.85
Number of Shares (in shares)	31
Weighted Average Remaining Contractual Term (in years)	4 months 13 days
Weighted Average Exercise Price (in dollars per share)	$ 37.17
Aggregate Intrinsic Value	$ 1,196
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of Shares (in shares)	31
Weighted Average Remaining Contractual Term (in years)	4 months 13 days
Weighted Average Exercise Price (in dollars per share)	$ 37.17
Aggregate Intrinsic Value	$ 1,196
$45.22 – $52.07
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of Exercise Prices, Lower (in dollars per share)	$ 45.22
Range of Exercise Prices, Upper (in dollars per share)	$ 52.07
Number of Shares (in shares)	379
Weighted Average Remaining Contractual Term (in years)	11 months 16 days
Weighted Average Exercise Price (in dollars per share)	$ 50.45
Aggregate Intrinsic Value	$ 9,377
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of Shares (in shares)	379
Weighted Average Remaining Contractual Term (in years)	11 months 16 days
Weighted Average Exercise Price (in dollars per share)	$ 50.45
Aggregate Intrinsic Value	$ 9,377
$52.61 – $72.26
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of Exercise Prices, Lower (in dollars per share)	$ 52.61
Range of Exercise Prices, Upper (in dollars per share)	$ 72.26
Number of Shares (in shares)	908
Weighted Average Remaining Contractual Term (in years)	3 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share)	$ 62.30
Aggregate Intrinsic Value	$ 11,697
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of Shares (in shares)	878
Weighted Average Remaining Contractual Term (in years)	3 years 26 days
Weighted Average Exercise Price (in dollars per share)	$ 62.08
Aggregate Intrinsic Value	$ 11,508
$74.28 – $92.65
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Range of Exercise Prices, Lower (in dollars per share)	$ 74.28
Range of Exercise Prices, Upper (in dollars per share)	$ 92.65
Number of Shares (in shares)	1,219
Weighted Average Remaining Contractual Term (in years)	5 years 10 months 10 days
Weighted Average Exercise Price (in dollars per share)	$ 88.03
Aggregate Intrinsic Value	$ 9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of Shares (in shares)	308
Weighted Average Remaining Contractual Term (in years)	5 years 3 months 22 days
Weighted Average Exercise Price (in dollars per share)	$ 83.57
Aggregate Intrinsic Value	$ 4