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Share-Based Compensation - Weighted-Average Assumptions Used for Grants of Stock Options and SARs (Detail) - SARs - $ / shares
6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield 0.00% 0.00%
Forfeiture rate 8.00% 8.20%
Volatility 42.51% 36.79%
Risk free interest rate 0.24% 2.28%
Expected weighted-average life 4 years 4 years 7 days
Weighted-average grant date fair value of SARs granted (per underlying share) (USD per share) $ 79.47 $ 64.17