Segment Information (Operations By Lines Of Business) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Sep. 28, 2019
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	$ 1,189,599,756	$ 1,062,262,169	$ 3,413,436,742	$ 3,125,942,755
Total income from operations	91,462,413	43,352,789	193,238,452	113,562,316
Total assets	2,011,113,223		2,011,113,223		$ 1,867,328,368
Elimination of intercompany receivable
Segment Reporting Information By Segment [Line Items]
Total assets	(2,213,000)		(2,213,000)		(2,296,000)
Grocery [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	452,725,000	352,687,000	1,255,718,000	1,079,884,000
Non-foods [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	281,306,000	238,471,000	788,252,000	694,036,000
Perishables [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	344,597,000	281,655,000	929,507,000	824,614,000
Gasoline [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	84,127,000	155,897,000	345,170,000	430,393,000
Retail [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	1,162,755,000	1,028,710,000	3,318,647,000	3,028,927,000
Total income from operations	89,206,000	38,746,000	181,496,000	100,796,000
Total assets	1,839,660,000		1,839,660,000		1,698,904,000
Other Segment [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	26,845,000	33,552,000	94,790,000	97,016,000
Total income from operations	2,256,000	$ 4,607,000	11,742,000	$ 12,766,000
Total assets	$ 173,666,000		$ 173,666,000		$ 170,720,000