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