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Segment Information (Operations By Lines Of Business) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019	Sep. 28, 2019
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	$ 1,145,482,049	$ 1,001,843,929	$ 2,223,836,986	$ 2,063,680,587
Total income from operations	63,300,678	30,745,989	101,776,039	70,209,528
Total assets	1,964,230,250		1,964,230,250		$ 1,867,328,368
Elimination of intercompany receivable [Member]
Segment Reporting Information By Segment [Line Items]
Total assets	(3,268,000)		(3,268,000)		(2,296,000)
Grocery [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	424,664,000	351,558,000	802,993,000	727,197,000
Non-foods [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	260,914,000	223,067,000	506,945,000	455,564,000
Perishables [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	304,105,000	267,565,000	584,910,000	542,960,000
Gasoline [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	121,932,000	127,985,000	261,044,000	274,496,000
Retail [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	1,111,615,000	970,175,000	2,155,892,000	2,000,217,000
Total income from operations	58,069,000	26,434,000	92,290,000	62,051,000
Total assets	1,792,303,000		1,792,303,000		1,698,904,000
Other Segment [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	33,867,000	31,669,000	67,945,000	63,464,000
Total income from operations	5,232,000	$ 4,312,000	9,486,000	$ 8,159,000
Total assets	$ 175,195,000		$ 175,195,000		$ 170,720,000