Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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RELATED PARTY INFORMATION - WAKEFERN (Details) - USD ($) $ in Thousands		6 Months Ended
	Aug. 15, 2017	Jan. 27, 2018	Jan. 28, 2017	Jul. 29, 2017
Related Party Transaction [Line Items]
Proceeds from Sale, Maturity and Collection of Long-term Investments		$ 22,172	$ 0
Due from Related Parties	$ 22,000
Investee [Member]
Related Party Transaction [Line Items]
Demand deposits at Wakefern		$ 69,619		$ 60,037
Related Party Note Receivable Maturing August 2017 [Member] \| Investee [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Basis Spread on Variable Rate	0.25%
Related Party Notes Receivable Maturing August 2022 [Member] \| Investee [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Basis Spread on Variable Rate	1.25%