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Segment Information (Operations By Lines Of Business) (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014	Sep. 27, 2014
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	$ 915,335,000imkta_Revenue	$ 947,761,000imkta_Revenue	$ 1,879,832,000imkta_Revenue	$ 1,892,885,000imkta_Revenue
Total income from operations	33,634,214us-gaap_OperatingIncomeLoss	27,804,626us-gaap_OperatingIncomeLoss	71,165,702us-gaap_OperatingIncomeLoss	54,004,984us-gaap_OperatingIncomeLoss
Total assets	1,658,240,281us-gaap_Assets		1,658,240,281us-gaap_Assets		1,656,951,564us-gaap_Assets
Elimination Of Intercompany Receivable [Member]
Segment Reporting Information By Segment [Line Items]
Total assets	(1,669,000)		(1,669,000)		(2,770,000)
Grocery Sales [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	879,838,000	908,448,000	1,805,840,000	1,818,534,000
Total income from operations	29,598,000	24,284,000	64,575,000	48,449,000
Total assets	1,515,901,000		1,515,901,000		1,515,055,000
Other Segment [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	35,496,000	39,313,000	73,992,000	74,351,000
Total income from operations	4,036,000	3,521,000	6,591,000	5,556,000
Total assets	$ 144,008,000		$ 144,008,000		$ 144,667,000