RELATED PARTY INFORMATION - WAKEFERN (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020
Related Party Transaction [Line Items]
Related party transaction amount	$ 632	$ 303
Wakefern
Related Party Transaction [Line Items]
Ownership interest in Wakefern	12.20%
Purchase obligation, as a percentage of merchandise requirements	85.00%
Purchase obligation period	10 years
Percentage of stockholders to request termination	75.00%
Indebtedness to Wakefern	$ 3,423
Vendor allowances and rebates	43,003	33,151
Support services incurred charges	47,462	33,303
Demand deposits invested at related party Wakefern	86,670	76,259
Interest income earned on investments related entity	3,522	3,992
Wakefern | Related Party Note Receivable Maturing August 2022
Related Party Transaction [Line Items]
Notes receivable from Wakefern	$ 27,325
Basis spread on variable rate (as a percent)	1.25%
Wakefern | Related Party Note Receivable Maturing February 2024
Related Party Transaction [Line Items]
Notes receivable from Wakefern	$ 27,970
Basis spread on variable rate (as a percent)	0.75%
Wakefern | Insure-Rite Ltd.
Related Party Transaction [Line Items]
Investment in Insure-Rite, Ltd	9.30%
Stock Subscriptions Outstanding, Payments Due In 2023
Related Party Transaction [Line Items]
Related party transaction amount	$ 844
Stock Subscriptions Outstanding, Payments Due In 2024
Related Party Transaction [Line Items]
Related party transaction amount	512
Stock Subscriptions Outstanding, Payments Due In 2025
Related Party Transaction [Line Items]
Related party transaction amount	512
Stock Subscriptions Outstanding, Payments Due In 2026
Related Party Transaction [Line Items]
Related party transaction amount	511
Stock Subscriptions Outstanding, Payments Due After 2026
Related Party Transaction [Line Items]
Related party transaction amount	412
Per Store Investment, Maximum | Wakefern
Related Party Transaction [Line Items]
Related party transaction amount	975	$ 950
Per Store Investment, Additions | Wakefern
Related Party Transaction [Line Items]
Related party transaction amount	$ 670