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Employee Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 01, 2016
Jun. 26, 2015
Jul. 01, 2016
Jun. 26, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share-based compensation     $ 12,501 $ 8,744 [1]
Shares issued under share-based compensation plans 50,446 69,235 154,075 300,235
Restricted Stock Units (RSUs)        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted     36,000 22,000
Weighted Average Grant Date Fair Value     $ 85.33 $ 112.53
Performance Share Plan Shares        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted     56,200 34,000
Grant Date Fair Value     $ 79.31 $ 117.53
Employee Share-save Scheme        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Discount rate of market value on purchase date     5.00%  
The term of options, years     3 years  
Number of options granted     70,673 25,984
Weighted-average grant date fair value of options granted     $ 16.65 $ 24.31
Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of options granted     221,200 192,700
Weighted-average grant date fair value of options granted     $ 35.69 $ 48.48
Employee Stock Purchase Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Discount rate of market value on purchase date     5.00%  
[1] (Recast)