BENEFIT PLANS - Net Periodic Benefit Cost (Income) Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 02, 2020	Apr. 27, 2019	May 02, 2020	Apr. 27, 2019
Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	13,602	24,004	43,894	49,855
Expected return on plan assets	(25,765)	(35,416)	(79,834)	(73,555)
Amortization of net actuarial loss (gain)	3	0	9	0
Pension settlement charge			10,303	0
Net periodic benefit (income) cost	(12,160)	(11,412)	(25,628)	(23,700)
Contributions to benefit plans	(1,500)	(2,386)	(6,750)	(2,574)
Other Postretirement Benefits
Net Periodic Benefit Cost
Service cost	14	55	42	114
Interest cost	236	478	708	993
Expected return on plan assets	(54)	(58)	(162)	(121)
Amortization of net actuarial loss (gain)	(780)	0	(2,337)	0
Pension settlement charge			0	0
Net periodic benefit (income) cost	(584)	475	(1,749)	986
Contributions to benefit plans	$ (175)	$ (92)	$ (335)	$ (218)