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Employee Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
11 Months Ended 12 Months Ended
Oct. 02, 2015
Sep. 30, 2016
Oct. 02, 2015
Oct. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation $ 10,771 $ 13,462 $ 12,106 [1] $ 13,044
Income tax benefit recognized $ 2,700 $ 3,600   $ 3,000
Weighted-average grant date fair value of options granted $ 47.85 $ 35.69    
Number of options exercised 182,322 112,790   618,645
Weighted average exercise price of options exercised $ 50.94 $ 48.61   $ 45.16
Aggregate intrinsic value of option shares outstanding   $ 17,800    
Aggregate intrinsic value of option shares exercisable   $ 17,200    
Number of option shares vested or expected to vest   1,300,000    
Option shares vested or expected to vest aggregate intrinsic value   $ 17,700    
Weighted average exercise price of option shares vested or expected to vest   $ 71.12    
Weighted average remaining contractual term of option shares vested or expected to vest, years   5 years 6 months    
Weighted average remaining contractual term of option shares currently exercisable   4 years 4 months 24 days    
Total unrecognized compensation expense for options   $ 7,400    
Fair value of option shares vested   $ 2,400    
Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award period   10 years    
Award period end date   Mar. 05, 2023    
Vesting period   4 years    
Unrecognized compensation expense will be recognized over a weighted average period, years   1 year 9 months 18 days    
Restricted Stock Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Unrecognized compensation expense will be recognized over a weighted average period, years   1 year 8 months 12 days    
Granted 28,150 37,000    
Total unrecognized compensation expense for options $ 3,400   $ 3,400  
Performance Shares        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted 36,800 56,275    
Performance period   3 years    
Performance Shares | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares paid out as percentage of target number of shares   0.00%    
Performance Shares | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares paid out as percentage of target number of shares   300.00%    
Employee Stock Purchase Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Purchase price fair market value percentage   95.00%    
Number of shares purchased by employees   24,441    
Employees purchase price per share fair market value   $ 71.44    
Employee Share-save Scheme        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock reserved for issuance, shares   142,030    
Accrued deductions for purchase of shares   $ 500    
Share purchase date   Dec. 15, 2016    
Discount rate of market value on purchase date   95.00%    
The term of options, years   3 years    
Remaining shares available for issuance   465,087    
Number of options granted 25,984 70,673   29,242
Weighted-average grant date fair value of options granted   $ 16.65    
Number of options exercised   1,813    
Weighted average exercise price of options exercised   $ 65.84    
Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Remaining shares available for issuance   866,158    
Shares reserved for issuance to officers and key employees   1,693,557    
[1] (Recast)