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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2018
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Income Tax [Line Items]        
Effective income tax rate   24.60% 30.50%  
Tax Cuts And Jobs Act Of 2017, incomplete accounting, provisional income tax expense (benefit)       $ 7,000,000
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense       13,700,000
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax benefit       $ 6,700,000
Tax Cuts And Jobs Act Of 2017, incomplete accounting, increase (decrease) in provisional income tax expense $ 1,800,000 $ 3,900,000    
Minimum        
Income Tax [Line Items]        
Decrease in unrecognized tax benefits   0    
Increase in unrecognized tax benefits   0    
Maximum        
Income Tax [Line Items]        
Decrease in unrecognized tax benefits   800,000    
Increase in unrecognized tax benefits   $ 1,500,000