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RELATED PARTY INFORMATION - WAKEFERN (Details) - USD ($)
$ in Thousands
9 Months Ended
Aug. 15, 2017
Apr. 28, 2018
Apr. 29, 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   $ 58,042   $ 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%