PENSION PLANS - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 27, 2018	Jan. 28, 2017
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 65	$ 116	$ 130	$ 255
Interest cost on projected benefit obligations	629	604	1,258	1,209
Expected return on plan assets	(820)	(973)	(1,640)	(1,946)
Amortization of net losses	142	378	284	755
Net periodic pension cost	$ 16	$ 125	$ 32	$ 273