PENSION PLANS - Fair Value of Pension Assets (Details) - USD ($) $ in Thousands	Jul. 27, 2019	Jul. 28, 2018
Defined Benefit Plan Disclosure [Line Items]
Cash	$ 37	$ 17
Equity Securities [Abstract]
Company stock	568	611
Mutual/Collective Trust Funds - U.S.	4,401	10,213
Mutual/Collective Trust Funds - International	2,613	8,337
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	57,554	41,893
Total	65,173	61,071
Level 1
Defined Benefit Plan Disclosure [Line Items]
Cash	37	17
Equity Securities [Abstract]
Company stock	568	611
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	605	628
FairValueMeasuredAtNetAssetValuePerShareMember [Domain]
Equity Securities [Abstract]
Mutual/Collective Trust Funds - U.S.	4,401
Mutual/Collective Trust Funds - International	2,613
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income	57,554
Total	64,568
Assets Measured at NAV/Level 2
Defined Benefit Plan Disclosure [Line Items]
Cash	0	0
Equity Securities [Abstract]
Company stock	$ 0	0
Mutual/Collective Trust Funds - U.S.		10,213
Mutual/Collective Trust Funds - International		8,337
Fixed Income Securities [Abstract]
Mutual/Collective Trust Funds - Fixed Income		41,893
Total		$ 60,443