PENSION PLANS - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 27, 2018	Oct. 28, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 53	$ 65
Interest cost on projected benefit obligations	655	629
Expected return on plan assets	(721)	(820)
Amortization of net losses	145	142
Net periodic pension cost	$ 132	$ 16