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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. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
[1]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation $ 10,771 $ 9,847 $ 13,462 $ 12,106
Income tax benefit recognized $ 2,700 $ 2,300 $ 3,600  
Weighted-average grant date fair value of options granted   $ 32.72 $ 35.69  
Number of options exercised 182,322 492,968 112,790  
Weighted average exercise price of options exercised $ 50.94 $ 51.70 $ 48.61  
Aggregate intrinsic value of option shares outstanding   $ 13,200    
Aggregate intrinsic value of option shares exercisable   $ 10,600    
Number of option shares vested or expected to vest   1,000,000    
Option shares vested or expected to vest aggregate intrinsic value   $ 12,900    
Weighted average exercise price of option shares vested or expected to vest   $ 81.59    
Weighted average remaining contractual term of option shares vested or expected to vest, years   6 years 3 months 19 days    
Weighted average remaining contractual term of option shares currently exercisable   4 years 10 months 25 days    
Total unrecognized compensation expense for options   $ 6,500    
Fair value of option shares vested   $ 1,400    
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 10 months 25 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 6 months    
Granted 28,150 37,100 37,000  
Total unrecognized compensation expense for options   $ 3,100    
Performance Share Plan Shares        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted 36,800 43,650 56,275  
Performance period   3 years    
Performance Share Plan Shares | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage of the target number of shares paid out   0.00%    
Performance Share Plan Shares | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage of the target number of shares paid out   300.00%    
Employee Share-save Scheme        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Accrued deductions for purchase of shares   $ 500    
Share purchase date   Dec. 15, 2017    
Discount rate of market value on purchase date   95.00%    
The term of options, years   3 years    
Common stock reserved for issuance, shares   136,770    
Remaining shares available for issuance   450,400    
Number of options granted 25,984 11,338 70,673  
Weighted-average grant date fair value of options granted   $ 24.61    
Number of options exercised   1,764    
Weighted average exercise price of options exercised   $ 69.12    
Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Remaining shares available for issuance   2,455,036    
Shares reserved for issuance to officers and key employees   3,617,032    
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   18,183    
Employees purchase price per share fair market value   $ 94.16    
[1] (Recast)