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Segment Information (Operations By Lines Of Business) (Details) - USD ($)	3 Months Ended
	Dec. 30, 2017	Dec. 24, 2016	Sep. 30, 2017
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	$ 1,013,786,078	$ 982,758,339
Total income from operations	35,888,502	32,166,383
Total assets	1,773,661,878		$ 1,733,305,774
Elimination of intercompany receivable [Member]
Segment Reporting Information By Segment [Line Items]
Total assets	(1,839,000)		(2,469,000)
Grocery [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	363,325,000	360,901,000
Non-foods [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	217,744,000	212,311,000
Perishables [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	265,294,000	255,849,000
Gasoline [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	136,674,000	118,523,000
Retail [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	983,037,000	947,584,000
Total income from operations	32,903,000	28,991,000
Total assets	1,639,964,000		1,600,699,000
Other Segment [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	30,749,000	35,174,000
Total income from operations	2,986,000	$ 3,175,000
Total assets	$ 135,538,000		$ 135,076,000

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Segment Reporting Information By Segment [Line Items]

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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