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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 26, 2020 USD ($) Segment $ / shares shares | Dec. 28, 2019 USD ($) $ / shares shares | Dec. 29, 2018 USD ($) shares
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 | 0
Dividends payable per share | $ / shares | $ 2.00 | $ 2.00 |
Dividend payable date | Jan. 22, 2021 | Jan. 24, 2020 |
Dividend record date | Jan. 08, 2021 | Jan. 10, 2020 |
Dividends payable | $ 76,770,000 | $ 78,947,000 |
Dividend announced date | Dec. 08, 2020 | Dec. 10, 2019 |
Self Insurance Reserve, Current | $ 149,774,000 | $ 44,532,000 |
Retained earnings | $ 2,046,238,000 | $ 1,962,161,000 |
Accounting Standards Update 2014-09 | Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Retained earnings |  |  | $ 773,000
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 |  |
Increase decrease in the provision for third party insurance premium | $ 14,000,000 |  |
Percentage increase decrease in the third party insurance premiums | 170.00% |  |
Self Insurance Reserve, Current | $ 104,000,000 |  |
Commercial Trucking Claims | Initial Excess Policy [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 5,000,000 |  |
Additional premium | 3,500,000 |  |
Commercial Trucking Claims | Third Party Insurance [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained aggregate liability | 104,000,000 |  |
Self insurance excess value maintain third party | 5,000,000 |  |
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 | Retained Liability Maximum In Aggregate For Three Year Policy From May 1 2019 To April 30 2022 [Member] | Initial Excess Policy [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained aggregate liability | 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 | Maximum | Additional Retained Liability, Maximum in Aggregate, for three year policy that goes May 1, 2019 through April 30, 2022 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained term aggregate | 20,000,000 |  |
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 |  |
Commercial Trucking Claims | Minimum | Third Party Insurance [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 5,000,000 |  |
Commercial Trucking Claims | Other Assets [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Claims receivable from third party insurance companies in excess of self insurance retention | 104,000,000 |  |
General Liability Claim |  |  |
Significant Accounting Policies [Line Items] |  |  |
Company retained liability per claim | 1,000,000 |  |
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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