Segment Information (Operations by Lines of Business) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 28, 2026	Dec. 27, 2025	Mar. 29, 2025	Dec. 28, 2024	Mar. 28, 2026	Mar. 29, 2025
Segment Reporting Information [Line Items]
Total revenues from unaffiliated customers	$ 1,307,863,099		$ 1,331,273,155		$ 2,680,840,665	$ 2,619,387,821
Merchandise costs (4)	982,604,471		1,020,296,521		2,021,024,334	2,007,276,472
Depreciation And Amortization					60,366,075	61,535,627
Income from operations	34,471,087		21,640,338		73,606,210	45,212,282
Other operating income	5,188,000		6,366,000		9,488,000	6,399,000
Other income	2,765,415		2,842,253		5,682,735	6,139,638
Interest expense	4,495,087		4,878,576		9,102,160	9,889,565
Income tax expense	8,474,000		4,498,000		17,791,000	9,768,000
Net income	24,267,415	$ 28,128,370	15,106,015	$ 16,588,340	52,395,785	31,694,355
Operating Segments [Member] | Retail Grocery [Member]
Segment Reporting Information [Line Items]
Total revenues from unaffiliated customers	1,256,275,000		1,277,003,000		2,575,665,000	2,522,068,000
Merchandise costs (4)	947,027,000		983,287,000		1,949,660,000	1,936,395,000
Salary and wages	146,515,000		148,066,000		296,280,000	284,045,000
Insurance costs	11,036,000		13,609,000		26,955,000	27,205,000
Repairs and maintenance	23,332,000		22,693,000		45,152,000	44,628,000
Bank charges	15,075,000		14,646,000		31,099,000	28,564,000
Depreciation And Amortization	22,656,000		23,340,000		45,586,000	46,965,000
Utilities	16,345,000		16,298,000		30,991,000	31,105,000
Other retail grocery expenses (5)	45,006,000		39,789,000		85,824,000	84,348,000
Income from operations	29,283,000		15,275,000		64,118,000	38,813,000
Operating Segments [Member] | Retail Grocery [Member] | Grocery [Member]
Segment Reporting Information [Line Items]
Total revenues from unaffiliated customers	489,864,000		492,048,000		991,994,000	969,583,000
Operating Segments [Member] | Retail Grocery [Member] | Non-foods [Member]
Segment Reporting Information [Line Items]
Total revenues from unaffiliated customers	264,891,000		286,174,000		570,353,000	575,617,000
Operating Segments [Member] | Retail Grocery [Member] | Perishables [Member]
Segment Reporting Information [Line Items]
Total revenues from unaffiliated customers	353,590,000		348,132,000		713,253,000	682,434,000
Operating Segments [Member] | Retail Grocery [Member] | Fuel [Member]
Segment Reporting Information [Line Items]
Total revenues from unaffiliated customers	147,930,000		150,649,000		300,065,000	294,434,000
All Other [Member]
Segment Reporting Information [Line Items]
Total revenues from unaffiliated customers	$ 51,588,000		$ 54,270,000		$ 105,176,000	$ 97,320,000