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RELATED PARTY INFORMATION - WAKEFERN (Details) - USD ($)	9 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Jul. 28, 2018
Related Party Transaction [Line Items]
Increase of required investment in Wakefern common stock	$ 1,482,000
Proceeds from Sale, Maturity and Collection of Long-term Investments	24,937,000	$ 22,172,000
Investee [Member]
Related Party Transaction [Line Items]
Demand deposits at Wakefern	$ 81,833,000		$ 63,413,000
Related Party Note Receivable Maturing August 2022 [Member] \| Investee [Member]
Related Party Transaction [Line Items]
Basis spread on prime rate	1.25%
Due from Related Parties	$ 24,278,000
Related Party Note Receivable Maturing February 2024 [Member] \| Investee [Member]
Related Party Transaction [Line Items]
Basis spread on prime rate	0.75%
Due from Related Parties	$ 25,129,000
Related Party Note Receivable Maturing February 2019 [Member] \| Investee [Member]
Related Party Transaction [Line Items]
Proceeds from Collection of Notes Receivable	$ 24,937