PENSION PLANS - Fair Value of Pension Assets (Details) - USD ($) $ in Thousands	Jul. 25, 2020	Jul. 27, 2019
Defined Benefit Plan Disclosure [Line Items]
Cash	$ 61	$ 37
Equity Securities [Abstract]
Company stock	573	568
Mutual/Collective Trust Funds - U.S.	1,214	4,401
Mutual/Collective Trust Funds - International	396	2,613
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	68,439	57,554
Total	70,683	65,173
Level 1
Defined Benefit Plan Disclosure [Line Items]
Cash	61	37
Equity Securities [Abstract]
Company stock	573	568
Mutual/Collective Trust Funds - U.S.		0
Mutual/Collective Trust Funds - International	0	0
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	0	0
Total	634	605
Assets Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Cash	0	0
Equity Securities [Abstract]
Company stock	0	0
Mutual/Collective Trust Funds - U.S.	1,214	4,401
Mutual/Collective Trust Funds - International	396	2,613
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	68,439	57,554
Total	$ 70,049	$ 64,568