Acquisitions (Details) - Scenario, Forecast [Member] - store	3 Months Ended
	Dec. 31, 2016	Sep. 24, 2016
Mars Super Market [Member] | Maryland [Member]
Acquisitions [Line Items]
Number of stores acquired		5
Food Lion, LLC [Member]
Acquisitions [Line Items]
Number of stores acquired	38
Food Lion, LLC [Member] | Maryland [Member]
Acquisitions [Line Items]
Number of stores acquired	21
Food Lion, LLC [Member] | Virginia [Member]
Acquisitions [Line Items]
Number of stores acquired	13
Food Lion, LLC [Member] | Delaware [Member]
Acquisitions [Line Items]
Number of stores acquired	4