PENSION PLANS - Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 25, 2020	Jul. 27, 2019
Compensation Related Costs [Abstract]
Service cost	$ 202	$ 213
Interest cost on projected benefit obligation	2,154	2,674
Expected return on plan assets	(2,792)	(2,873)
Loss on settlement	1,604
Amortization of gains and losses	555	605
Net periodic pension cost	$ 1,723	$ 1,060