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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 25, 2020
Share-based Payment Arrangement [Abstract]  
Stock Option Activity Stock option activity during the twenty-six weeks ended June 25, 2020 was as follows:
​OptionsWeighted Average Exercise Price
Outstanding at December 27, 20196,037,079  $13.64  
Granted278,499  57.22  
Exercised(1,291,255) 6.71  
Forfeited or expired(91,618) 23.00  
Outstanding at June 25, 20204,932,705  $17.74  
Vested and exercisable at June 25, 20202,746,188  $10.39  
Estimated Fair Value of Stock Option Grants
The Company estimated the fair value of stock option grants using the Black-Scholes-Merton option pricing model with the following weighted average assumptions during the period:
​Twenty-six Weeks Ended
​June 25, 2020
Risk-free interest rate1.22 %
Expected volatility38.7 %
Expected life (in years)5.75
Dividend yield— %
Restricted Stock Unit Activity
The following table summarizes restricted stock unit activity during the twenty-six weeks ended June 25, 2020:
Restricted Stock Units
Unvested at December 27, 2019—  
Granted114,440  
Vested—  
Forfeited(2,060) 
Unvested at June 25, 2020112,380  
Restricted Stock Award Activity
The following table summarizes restricted stock award activity during the twenty-six weeks ended June 25, 2020:
Restricted Stock Awards
Service-basedPerformance-basedTSR
Unvested at December 27, 201937,032  —  —  
Granted102,931  160,315  104,456  
Vested(3,870) —  —  
Forfeited—  —  —  
Unvested at June 25, 2020136,093  160,315  104,456