BENEFIT PLANS BENEFIT PLANS - Net Periodic Benefit Cost (Income) Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 01, 2020	Jan. 26, 2019	Feb. 01, 2020	Jan. 26, 2019
Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	13,602	24,004	30,292	25,851
Expected return on plan assets	(26,587)	(35,415)	(54,069)	(38,139)
Amortization of net actuarial loss (gain)	3	0	6	0
Pension settlement charge	10,303	0	10,303	0
Net periodic benefit (income) cost	(2,679)	(11,411)	(13,468)	(12,288)
Contributions to benefit plans	(1,150)	(151)	(5,250)	(188)
Other Postretirement Benefits
Net Periodic Benefit Cost
Service cost	14	55	28	59
Interest cost	236	477	472	515
Expected return on plan assets	(54)	(58)	(108)	(63)
Amortization of net actuarial loss (gain)	(780)	0	(1,557)	0
Pension settlement charge	0	0	0	0
Net periodic benefit (income) cost	(584)	474	(1,165)	511
Contributions to benefit plans	$ (60)	$ (117)	$ (160)	$ (126)