Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of assumptions used to estimate the fair value of stock option awards granted

The fair value of stock option awards granted was estimated using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions:

	Fiscal Year Ended December 31, 2020		Fiscal Year Ended December 26, 2019		Fiscal Year Ended December 27, 2018
Weighted average fair value per stock option	$	22.27	$	20.38	$	15.63
Risk-free interest rate	1.17%		2.06%		3.05%
Expected volatility	39%		45%		45%
Expected life (in years)	5.75		6.68		6.29
Dividend yield	—%		—%		—%

Schedule of stock option activity

The table below summarizes stock option activity for the fiscal year ended December 31, 2020:

	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 26, 2019	6,037,079	$	13.64
Granted	294,563	58.15
Exercised	(2,485,427)	7.75
Forfeited or expired	(105,611)	25.71
Outstanding at December 31, 2020	3,740,604	$	20.72	5.9	$	269,794
Vested and exercisable at December 31, 2020	2,071,137	$	13.22	4.8	$	164,918

Schedule of restricted stock unit activity

The following table summarizes restricted stock unit activity during the fiscal year ended December 31, 2020:

	Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested at December 27, 2019	—	$	—
Granted	133,256	59.24
Vested	—	—
Forfeited	(5,036)	55.08
Unvested at December 31, 2020	128,220	$	59.40

Schedule of restricted stock award activity

The following table summarizes restricted stock award activity during the fiscal year ended December 31, 2020:

	Restricted Stock Awards
	Service-based			Performance-based			TSR
	Shares	Weighted Average Grant Date Fair Value		Shares	Weighted Average Grant Date Fair Value		Shares	Weighted Average Grant Date Fair Value
Unvested at December 27, 2019	37,032	$	35.78	—	$	—	—	$	—
Granted	103,767	57.84		160,315	57.70		104,456	44.28
Vested	(8,955)	27.23		—	—		—	—
Forfeited	—	—		—	—		—	—
Unvested at December 31, 2020	131,844	$	53.72	160,315	$	57.70	104,456	$	44.28