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Employee Stock Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Mar. 27, 2020
Jun. 26, 2020
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted stock units 100,000 800,000
Weighted average fair value, granted $ 24.00 $ 17.84
Stock-based compensation cost, net of estimated forfeitures, recognized   $ 20.4
Outstanding restricted stock   1,900,000
Aggregate fair value   $ 43.5
Weighted average remaining contractual term (in years)   1 year 4 months 24 days
Vested shares withheld to satisfy withholding tax obligations   100,000
Vested shares issued net of tax withholdings   400,000
Restricted Stock Units [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares vesting period, years   2 years
Restricted Stock Units [Member] | Employees [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares vesting period, years   3 years
Unit purchase price of Restricted Stock Units   $ 0.0
Performance Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares vesting period, years   2 years
Stock-based compensation cost, net of estimated forfeitures, recognized   $ 20.4
Outstanding restricted stock   1,900,000
Aggregate fair value   $ 43.5
Weighted average remaining contractual term (in years)   1 year 4 months 24 days
Restricted Stock Awards [Member] | Non-Employee Directors [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding restricted stock   44,000
Unamortized expense of company's unvested restricted stock awards   $ 0.8