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Common Stock and Share-Based Compensation (Tables)

12 Months Ended

Dec. 25, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock Options under Equity Plan and Non-Employee Director Plan

Information related to stock options under the Equity Plan and the Non-Employee Director Plan is summarized as follows:

		Shares				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term in Years				Aggregate Intrinsic Value (in thousands)
Outstanding at December 26, 2020			241,847			$	228.58
Granted			20,420				1,031.01
Exercised			(40,913	)			186.52
Outstanding at December 25, 2021			221,354			$	310.38				5.53			$	54,048
Exercisable at December 25, 2021			98,390			$	228.66				4.78			$	28,199
Vested and expected to vest at December 25, 2021			205,369			$	305.29				5.48			$	50,688

Stock-Based Compensation Expense Included in Operating Expenses

The following table provides information regarding stock-based compensation expense included in operating expenses in the accompanying consolidated statements of comprehensive income:

		2021				2020				2019
		(in thousands)
Amounts included in advertising, promotional and    selling expenses		$	5,612			$	4,467			$	3,996
Amounts included in general and administrative    expenses			13,003				10,815				8,341
Total stock-based compensation expense		$	18,615			$	15,282			$	12,337
Amounts related to performance-based stock awards    included in total stock-based compensation expense		$	3,384			$	2,771			$	1,944

Weighted Average Assumptions used to Estimate Fair Value of Stock Options

Weighted average assumptions used to estimate fair values of stock options on the date of grants are as follows:

		2021				2020				2019
Expected volatility			36.1	%			32.6	%			32.1	%
Risk-free interest rate			1.45	%			1.09	%			2.63	%
Expected dividends			0	%			0	%			0	%
Exercise factor		2.6 times				2.1 times				2.33 times
Discount for post-vesting restrictions			0.0	%			0.0	%			0.0	%

Summary of Vesting Activities of Shares Issued Under Investment Share Program and Restricted Stock Awards

The following table summarizes vesting activities of shares issued under the investment share program and restricted stock awards:

		Number of Shares				Weighted Average Fair Value
Non-vested at December 26, 2020			114,316			$	263.47
Granted			17,821				877.10
Vested			(42,038	)			227.40
Forfeited			(1,251	)			458.28
Non-vested at December 25, 2021			88,848			$	401.70

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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