PENSION PLANS - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 53	$ 65	$ 106	$ 130
Interest cost on projected benefit obligations	655	629	1,310	1,258
Expected return on plan assets	(721)	(820)	(1,442)	(1,640)
Amortization of net losses	145	142	290	284
Net periodic pension cost	$ 132	$ 16	$ 264	$ 32