PENSION PLANS - Fair Value of Pension Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 25, 2020
Defined Benefit Plan Disclosure [Line Items]
Cash	$ 83	$ 61
Equity Securities [Abstract]
Mutual/Collective Trust Funds - U.S.	1,174	1,214
Mutual/Collective Trust Funds - International	387	396
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	60,891	68,439
Total	63,047	70,683
Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party
Equity Securities [Abstract]
Company stock	512	573
Level 1
Defined Benefit Plan Disclosure [Line Items]
Cash	83	61
Equity Securities [Abstract]
Mutual/Collective Trust Funds - U.S.	0	0
Mutual/Collective Trust Funds - International	0	0
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	0	0
Total	595	634
Level 1 | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party
Equity Securities [Abstract]
Company stock	512	573
Assets Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Cash	0	0
Equity Securities [Abstract]
Mutual/Collective Trust Funds - U.S.	1,174	1,214
Mutual/Collective Trust Funds - International	387	396
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	60,891	68,439
Total	62,452	70,049
Assets Measured at NAV | Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party
Equity Securities [Abstract]
Company stock	$ 0	$ 0