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Employee Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation $ 7,352 $ 7,578
Shares issued under share-based compensation plans 345,484 103,629
Restricted Stock Units (RSUs)    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 37,100 36,000
Weighted Average Grant Date Fair Value $ 76.83 $ 85.33
Performance Share Plan Shares    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 42,600 55,300
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]    
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 234,700 218,200
Weighted-average grant date fair value of options granted $ 32.60 $ 35.84
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%