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Segment Information (Operations By Lines Of Business) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	$ 1,062,262,169	$ 1,034,768,578	$ 3,125,942,755	$ 3,033,116,829
Total income from operations	43,352,789	29,778,193	113,562,316	89,220,867
Total assets	1,839,033,323		1,839,033,323		$ 1,824,910,820
Elimination of intercompany receivable [Member]
Segment Reporting Information By Segment [Line Items]
Total assets	(2,533,000)		(2,533,000)		(2,378,000)
Grocery [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	352,687,000	343,687,000	1,079,884,000	1,055,896,000
Non-foods [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	238,471,000	221,885,000	694,036,000	648,043,000
Perishables [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	281,655,000	273,339,000	824,614,000	800,018,000
Gasoline [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	155,897,000	165,510,000	430,393,000	438,722,000
Retail [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	1,028,710,000	1,004,421,000	3,028,927,000	2,942,679,000
Total income from operations	38,746,000	26,555,000	100,796,000	79,843,000
Total assets	1,663,762,000		1,663,762,000		1,679,301,000
Other Segment [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	33,552,000	30,348,000	97,016,000	90,438,000
Total income from operations	4,607,000	$ 3,223,000	12,766,000	$ 9,378,000
Total assets	$ 177,804,000		$ 177,804,000		$ 147,988,000