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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 28, 2024 USD ($) Segment $ / shares shares | Dec. 30, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) shares | Dec. 25, 2021 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of reporting units | Segment | 2 |  |  |
Stock options excluded from calculation of diluted earnings per share, antidilutive | shares |  | 0 | 0 |
Dividends payable | $ 70,632,000 | $ 71,433,000 |  |
Restricted Cash | 0 | 0 | $ 0 | $ 4,049,000
Short-term investments | 51,619,000 | 59,661,000 |  | $ 35,778,000
Agent notes receivable | $ 26,606,000 | $ 5,079,000 |  |
Weighted average number of shares outstanding, diluted, adjustment | shares | 0 | 0 | 0 |
Common Stock [Member] | S 2023 A Dividends [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Dividends payable per share | $ / shares |  | $ 2 |  |
Dividend payable date |  | Jan. 19, 2024 |  |
Dividend record date |  | Jan. 03, 2024 |  |
Dividends payable |  | $ 71,433,000 |  |
Dividend announced date |  | Dec. 04, 2023 |  |
Common Stock [Member] | S 2024 A Dividends [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Dividends payable per share | $ / shares | $ 2 |  |  |
Dividend payable date | Jan. 21, 2025 |  |  |
Dividend record date | Jan. 07, 2025 |  |  |
Dividends payable | $ 70,632,000 |  |  |
Dividend announced date | Dec. 09, 2024 |  |  |
Buildings And Improvements |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciated life | 30 years |  |  |
Trailing Equipment | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciated life | 10 years |  |  |
Trailing Equipment | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciated life | 7 years |  |  |
Hardware And Software | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciated life | 7 years |  |  |
Hardware And Software | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Depreciated life | 3 years |  |  |
Commercial Trucking Claims |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained aggregate liability | $ 10,000,000 |  |  |
Self insurance excess value maintain third party | 5,000,000 |  |  |
Commercial Trucking Claims | Initial Excess Policy [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Liability for claims and claims adjustment expense | 18,000,000 |  |  |
Commercial Trucking Claims | Third Party Insurance [Member] | Excess Coverage Policy [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Self insurance excess value maintain third party | 10,000,000 |  |  |
Commercial Trucking Claims | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim |  |  | $ 10,000,000 |
Commercial Trucking Claims | Maximum | Initial Excess Policy [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained aggregate liability |  | $ 15,000,000 |  |
Commercial Trucking Claims | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim |  |  | $ 5,000,000 |
Commercial Trucking Claims | Minimum | Initial Excess Policy [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained aggregate liability |  | $ 5,000,000 |  |
General Liability Claim |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim | 2,000,000 |  |  |
Workers' Compensation Claim |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim | 250,000 |  |  |
Workers' Compensation Claim | BCO Independent Contractor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim | 750,000 |  |  |
Cargo Claim |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim | 250,000 |  |  |
Occupational Reinsurance Claims One [Member] | BCO Independent Contractor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim | 500,000 |  |  |
Occupational Reinsurance Claims Two [Member] | BCO Independent Contractor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim | 1,000,000 |  |  |
Occupational Reinsurance Claims Three [Member] | BCO Independent Contractor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Company retained liability per claim | $ 2,000,000 |  |  |

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