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Employee Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 01, 2016
Mar. 27, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation $ 7,578 $ 6,274 [1]
Shares issued under share-based compensation plans 103,629 231,000
Restricted Stock Units (RSUs)    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 36,000 20,300
Weighted Average Grant Date Fair Value $ 85.33 $ 113.98
Performance Share Plan Shares    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 55,300 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 0 0
Equity Incentive Plan    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of options granted 218,200 187,500
Weighted-average grant date fair value of options granted $ 35.84 $ 48.62
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)