BENEFIT PLANS - Net Periodic Benefit Cost (Income) Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Nov. 02, 2019
Pension Benefits
Net Periodic Benefit (Income) Cost
Service cost	$ 0	$ 0
Interest cost	9,164	16,690
Expected return on plan assets	(25,965)	(27,482)
Amortization of prior service credit	0	0
Amortization of net actuarial loss (gain)	356	3
Net periodic benefit income	(16,445)	(10,789)
Contributions to benefit plans	(375)	(4,100)
Other Postretirement Benefits
Net Periodic Benefit (Income) Cost
Service cost	12	14
Interest cost	103	236
Expected return on plan assets	(26)	(54)
Amortization of prior service credit	(350)	(350)
Amortization of net actuarial loss (gain)	(315)	(427)
Net periodic benefit income	(576)	(581)
Contributions to benefit plans	$ (950)	$ (100)