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Segment Information (Operations By Lines Of Business) (Details) (USD $)	3 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Sep. 27, 2014
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	$ 964,497,000imkta_Revenue	$ 945,125,000imkta_Revenue
Total income from operations	37,531,487us-gaap_OperatingIncomeLoss	26,200,359us-gaap_OperatingIncomeLoss
Total assets	1,675,583,961us-gaap_Assets		1,656,951,564us-gaap_Assets
Elimination Of Intercompany Receivable [Member]
Segment Reporting Information By Segment [Line Items]
Total assets	(2,294,000)	(2,770,000)
Grocery Sales [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	926,002,000	910,087,000
Total income from operations	34,977,000	24,165,000
Total assets	1,442,300,000	1,515,055,000
Other Segment [Member]
Segment Reporting Information By Segment [Line Items]
Total revenues from unaffiliated customers	38,495,000	35,038,000
Total income from operations	2,555,000	2,035,000
Total assets	$ 235,578,000	$ 144,667,000