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Employee Stock Plans - Additional Information (Detail)
$ in Thousands
12 Months Ended
Oct. 02, 2015
USD ($)
performance_period
shares
Sep. 26, 2014
USD ($)
shares
Sep. 27, 2013
USD ($)
shares
Sep. 28, 2012
shares
Feb. 28, 2005
shares
Employee Stock Plans [Line Items]          
Total pre-tax intrinsic value of options exercised | $ $ 51,100 $ 54,400 $ 66,300    
Shares vested during the year (in shares) 500,000 335,000 396,000    
Shares vested during the year, fair value | $ $ 44,500        
Shares withheld for employees minimum withholding taxes at vesting (in shares) 183,458        
Shares repurchased for tax withholdings on vesting of restricted stock and restricted stock units | $ $ (16,323) $ (8,764) $ (9,560)    
Purchase period (in months) 6 months        
Maximum number of shares purchased (in shares) 7,000,000        
Number of shares issued 237,657 261,230      
Shares issued, value | $ $ 16,300 $ 15,300      
Number of shares available for issuance 6,661,000 8,168,000 9,925,000 11,868,000  
Stock Options          
Employee Stock Plans [Line Items]          
Unrecognized compensation expense related to outstanding stock awards | $ $ 10,600        
Weighted average period unrecognized compensation expense is expected to be recognized (in years) 1 year 7 months 10 days        
Restricted Stock Restricted Stock Units Deferred Stock Units And Performance Units          
Employee Stock Plans [Line Items]          
Unrecognized compensation expense related to outstanding stock awards | $ $ 34,100        
Weighted average period unrecognized compensation expense is expected to be recognized (in years) 1 year 8 months 12 days        
Employee Stock Purchase Plans          
Employee Stock Plans [Line Items]          
Common stock employee purchase price percentage lower than fair market value 85.00%        
Third Amended 2005 Plan          
Employee Stock Plans [Line Items]          
Number of shares authorized (in shares)         24,950,000
Award vesting percentage 33.33%        
Share Based Compensation Arrangement By Share Based Payment Award, Other Than Options, Number Of Shares Counted Against Available For Grant Limit For Every One Share Awarded 2.5        
Third Amended 2005 Plan | After February 9, 2012          
Employee Stock Plans [Line Items]          
Share Based Compensation Arrangement By Share Based Payment Award, Other Than Options, Number Of Shares Counted Against Available For Grant Limit For Every One Share Awarded 2.6        
Third Amended 2005 Plan | Beginning In Fiscal 2015          
Employee Stock Plans [Line Items]          
Maximum payout of shares that could be issued for each performance unit granted (in shares) 2.0        
Third Amended 2005 Plan | Stock Options          
Employee Stock Plans [Line Items]          
Shares counted against the available for grant (in shares) 1        
Third Amended 2005 Plan | Restricted Stock Units (RSUs)          
Employee Stock Plans [Line Items]          
Period between grant date and retirement date (in years) 1 year        
Third Amended 2005 Plan | Maximum | Restricted Stock And Restricted Stock Unit          
Employee Stock Plans [Line Items]          
Award vesting period (in years) 3 years        
Third Amended 2005 Plan | Minimum | Restricted Stock And Restricted Stock Unit          
Employee Stock Plans [Line Items]          
Award vesting period (in years) 1 year        
Third Amended 2005 Plan | Minimum | Deferred Stock Units          
Employee Stock Plans [Line Items]          
Award vesting period (in years) 1 year        
Common stock equivalent (in shares) 1        
Third Amended 2005 Plan | Performance Shares          
Employee Stock Plans [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Performance Periods | performance_period 1        
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period 3 years        
Third Amended 2005 Plan | Performance Shares, Company Performance [Member]          
Employee Stock Plans [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period 1 year        
Third Amended 2005 Plan | Performance Units          
Employee Stock Plans [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Performance Period 3 years        
Employee Stock Purchase Plans          
Employee Stock Plans [Line Items]          
Number of shares available for issuance 5,900,000        
Tranche One | Third Amended 2005 Plan          
Employee Stock Plans [Line Items]          
Award vesting period (in years) 1 year        
Period between grant date and retirement date (in years) 1 year        
Tranche Two | Third Amended 2005 Plan          
Employee Stock Plans [Line Items]          
Award vesting period (in years) 2 years        
Before February 16, 2007 | Third Amended 2005 Plan | Stock Options          
Employee Stock Plans [Line Items]          
Award expiration period 10 years        
After February 16, 2007 | Third Amended 2005 Plan | Stock Options          
Employee Stock Plans [Line Items]          
Award expiration period 7 years        
Before Fiscal Year 2015 | Third Amended 2005 Plan          
Employee Stock Plans [Line Items]          
Maximum payout of shares that could be issued for each performance unit granted (in shares) 1.5