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Common Stock and Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 | Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options, contractual term |  | 5 years 11 months 4 days |  |  |
Other than options granted in period |  | 42,530 |  |  |
Stock option outstanding |  | 241,847 | 315,678 |  |
Options granted in period - weighted average fair value |  | $ 153.31 | $ 131.91 | $ 92.89 |
Weighted average fair value of stock awards |  | $ 350.96 |  |  |
Expected dividends |  | 0.00% | 0.00% | 0.00% |
Estimated forfeiture rate for equity awards that do not vest on January 1st |  | 13.00% |  |  |
Total fair value of options vested in period |  | $ 4,800 | $ 2,500 | $ 3,200 |
Aggregate intrinsic value of stock options exercised in period |  | 45,900 | $ 20,900 | $ 19,200 |
Unrecognized compensation costs |  | $ 28,600 |  |  |
Unrecognized compensation costs, weighted average period |  | 2 years |  |  |
Option vested, number of shares |  | 45,860 | 33,205 | 20,678 |
Option vested, weighted average fair value |  | $ 214.23 | $ 188.63 | $ 156.50 |
Repurchase of shares |  | 13,797,037 | 13,797,037 | 13,797,037 | 13,447,346
Repurchased of value |  | $ 840,664 | $ 840,664 | $ 840,664 | $ 752,352
President and Chief Executive Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted in period | 9,959 |  |  |  |
Options granted in period - weighted average fair value | $ 100.50 |  |  |  |
Performance-Based Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock option outstanding |  | 14,962 |  |  |
Performance-Based Awards | Board of Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock option outstanding |  | 24,699 |  |  |
Non-Employee Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted in period |  | 4,410 | 4,779 | 5,080 |
Non-Employee Director | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options, contractual term |  | 10 years |  |  |
Employee Stock Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Options granted in period |  | 21,992 | 26,507 | 27,490 |
Employee Stock Compensation Plan | Investment Share Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 5 years |  |  |
Share based compensation arrangement by share based payment award participants payment description |  | Participants may pay for these shares either up front or through payroll deductions over an eleven-month period during the year of purchase. |  |  |
Shares employees elected to purchase |  | 9,127 | 7,901 | 9,214 |
Employee Stock Compensation Plan | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Employee Stock Compensation Plan | Minimum | Investment Share Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Requirement tenure of employee for investment share program, purchase shares at discount |  | 1 year |  |  |
Discount from current market value |  | 0.00% |  |  |
Employee Stock Compensation Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 5 years |  |  |
Stock options, contractual term |  | 10 years |  |  |
Employee Stock Compensation Plan | Maximum | Investment Share Program |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Discount from current market value |  | 40.00% |  |  |
Restricted Stock Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Other than options granted in period |  | 33,403 | 22,509 | 83,561 |
Restricted Stock Awards | Chief Executive Officer |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Other than options granted in period | 64,325 |  |  |  |
Weighted average fair value of stock awards | $ 229.30 |  |  |  |
Restricted Stock Awards | Performance-Based Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Other than options granted in period |  | 2,696 |  |  |
Restricted Stock Awards | Service-Based Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Other than options granted in period |  | 30,707 |  |  |
Restricted Stock Awards | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 1 year |  |  |
Restricted Stock Awards | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 5 years |  |  |
Common Class A | Non-Employee Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for issuance |  | 600,000 |  |  |
Shares available for grant |  | 100,000 |  |  |
Common Class A | Employee Stock Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for issuance |  | 6,700,000 |  |  |
Shares available for grant |  | 1,000,000.0 |  |  |

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