PENSION PLANS - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 28, 2017	Jan. 23, 2016	Jan. 28, 2017	Jan. 23, 2016
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 116	$ 1,104	$ 255	$ 2,208
Interest cost on projected benefit obligations	604	827	1,209	1,654
Expected return on plan assets	(973)	(940)	(1,946)	(1,880)
Amortization of net losses	378	482	755	964
Net periodic pension cost	$ 125	$ 1,473	$ 273	$ 2,946