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Common Stock and Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 26, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [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 28, 2019 |  |  | 315,678 |  |  | $ | 186.53 |  |  |  |  |  |  |  |  |
Granted |  |  | 26,402 |  |  |  | 393.54 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (2,595 | ) |  |  | 242 |  |  |  |  |  |  |  |  |
Exercised |  |  | (97,638 | ) |  |  | 136.87 |  |  |  |  |  |  |  |  |
Outstanding at December 26, 2020 |  |  | 241,847 |  |  | $ | 228.58 |  |  |  | 5.93 |  |  | $ | 190,176 |
Exercisable at December 26, 2020 |  |  | 53,638 |  |  | $ | 211.32 |  |  |  | 5.16 |  |  | $ | 43,104 |
Vested and expected to vest at December 26, 2020 |  |  | 217,604 |  |  | $ | 227.97 |  |  |  | 5.91 |  |  | $ | 171,246 |
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:
|  | 2020 |  |  | 2019 |  |  | 2018 |
|  | (in thousands) |
Amounts included in advertising, promotional and selling expenses |  | $ | 4,467 |  |  | $ | 3,996 |  |  | $ | 3,243 |
Amounts included in general and administrative expenses |  |  | 10,815 |  |  |  | 8,341 |  |  |  | 6,792 |
Total stock-based compensation expense |  | $ | 15,282 |  |  | $ | 12,337 |  |  | $ | 10,035 |
Amounts related to performance-based stock awards included in total stock-based compensation expense |  | $ | 2,771 |  |  | $ | 1,944 |  |  | $ | 1,750 |
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:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Expected volatility |  |  | 32.6 | % |  |  | 32.1 | % |  |  | 34.0 | %
Risk-free interest rate |  |  | 1.09 | % |  |  | 2.63 | % |  |  | 2.68 | %
Expected dividends |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Exercise factor |  | 2.1 times |  |  | 2.33 times |  |  | 2.52 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 28, 2019 |  |  | 122,142 |  |  | $ | 213.52 |
Granted |  |  | 42,530 |  |  |  | 350.96 |
Vested |  |  | (45,860 | ) |  |  | 214.23 |
Forfeited |  |  | (4,496 | ) |  |  | 236.63 |
Non-vested at December 26, 2020 |  |  | 114,316 |  |  | $ | 263.47 |
Stock Repurchases | As of December 26, 2020, the Company has repurchased a cumulative total of approximately 13.8 million shares of its Class A Common Stock for an aggregate purchase price of approximately $840.7 million as follows:
|  | Number of Shares |  |  | Aggregate Purchase Price |
|  | (in thousands) |
Repurchased at December 30, 2017 |  |  | 13,447,346 |  |  | $ | 752,352 |
2018 repurchases |  |  | 349,691 |  |  |  | 88,312 |
Repurchased at December 29, 2018 |  |  | 13,797,037 |  |  |  | 840,664 |
2019 repurchases |  |  | — |  |  |  | — |
Repurchased at December 28, 2019 |  |  | 13,797,037 |  |  |  | 840,664 |
2020 repurchases |  |  | — |  |  |  | — |
Repurchased at December 26, 2020 |  |  | 13,797,037 |  |  | $ | 840,664 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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