Information Regarding Reportable Business Segments (Detail) - USD ($)	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Dec. 25, 2021
Segment Reporting Information [Line Items]
Revenue	$ 5,303,322,000	$ 7,436,562,000	$ 6,537,568,000
Investment income	10,141,000	3,162,000	2,857,000
Interest and debt (income) expense	(3,946,000)	3,620,000	3,976,000
Depreciation and amortization	58,153,000	57,453,000	49,609,000
Operating income	344,149,000	571,083,000	505,668,000
Expenditures on long-lived assets	25,688,000	26,005,000	23,261,000
Goodwill	42,275,000	41,220,000	40,768,000
Finance lease additions	4,093,000	30,659,000	48,674,000
Total assets	1,801,846,000	1,931,879,000	2,045,465,000
Related Party [Member]
Segment Reporting Information [Line Items]
Revenue	67,977,000	79,229,000	62,558,000
Transportation Logistics
Segment Reporting Information [Line Items]
Revenue	5,230,846,000	7,358,008,000	6,465,711,000
Interest and debt (income) expense	(3,946,000)	3,620,000	3,976,000
Depreciation and amortization	58,153,000	57,453,000	49,609,000
Operating income	288,574,000	524,500,000	464,282,000
Expenditures on long-lived assets	25,688,000	26,005,000	23,261,000
Goodwill	42,275,000	41,220,000	40,768,000
Finance lease additions	4,093,000	30,659,000	48,674,000
Total assets	1,463,236,000	1,704,557,000	1,736,854,000
Insurance
Segment Reporting Information [Line Items]
Revenue	72,476,000	78,554,000	71,857,000
Investment income	10,141,000	3,162,000	2,857,000
Operating income	55,575,000	46,583,000	41,386,000
Total assets	338,610,000	227,322,000	308,611,000
Insurance | Related Party [Member]
Segment Reporting Information [Line Items]
Revenue	$ 67,977,000	$ 79,229,000	$ 62,558,000