Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jan. 31, 2020	Jan. 31, 2020	Aug. 01, 2019	Jul. 31, 2019	Jan. 31, 2019
Amortization of the finance ROU assets	$ 2,438	$ 4,876
Finance Lease, Interest Expense	8,509	17,017
Operating lease expense	10,411	20,448
Short-term lease expense1	2,459	4,812
Variable lease expense	$ 1,339	2,181
Operating cash outflows for operating leases		25,435
Operating cash outflows for finance leases		15,180
Financing cash outflows for finance leases		$ 5,387
Operating Lease, Weighted Average Remaining Lease Term	10 years 8 months 12 days	10 years 8 months 12 days
Finance Lease, Weighted Average Remaining Lease Term	43 years 4 months 24 days	43 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	4.50%	4.50%
Finance Lease, Weighted Average Discount Rate, Percent	10.00%	10.00%
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 30,141	$ 30,141
Lessee, Operating Lease, Liability, Payments, Due Year Two	45,805	45,805
Lessee, Operating Lease, Liability, Payments, Due Year Three	42,606	42,606
Lessee, Operating Lease, Liability, Payments, Due Year Four	37,666	37,666
Lessee, Operating Lease, Liability, Payments, Due Year Five	33,889	33,889
Lessee, Operating Lease, Liability, Payments, Due after Year Five	166,166	166,166
Lessee, Operating Lease, Liability, Payments, Due	356,273	356,273
Less amount representing interest	(92,149)	(92,149)
Operating Lease, Liability	264,124	264,124	$ 258,000
Finance Lease, Liability, Payments, Remainder of Fiscal Year	14,126	14,126
Finance Lease, Liability, Payments, Due Year Two	28,818	28,818
Finance Lease, Liability, Payments, Due Year Three	29,394	29,394
Finance Lease, Liability, Payments, Due Year Four	29,982	29,982
Finance Lease, Liability, Payments, Due Year Five	30,582	30,582
Finance Lease, Liability, Payments, Due after Year Five	1,805,048	1,805,048
Finance Lease, Liability, Payment, Due	1,937,950	1,937,950
Less amount representing interest	(1,594,803)	(1,594,803)
Finance Lease, Liability	343,147	343,147
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year				$ 44,984
Lessee, Operating Lease, Liability, Payments, Due Year Two				42,512
Lessee, Operating Lease, Liability, Payments, Due Year Three				39,440
Lessee, Operating Lease, Liability, Payments, Due Year Four				34,840
Lessee, Operating Lease, Liability, Payments, Due Year Five				30,836
Lessee, Operating Lease, Liability, Payments, Due after Year Five				142,526
Lessee, Operating Lease, Liability, Payments, Due				335,138
Capital Leases, Future Minimum Payments Due, Next Twelve Months				28,253
Capital Leases, Future Minimum Payments Due in Two Years				28,818
Capital Leases, Future Minimum Payments Due in Three Years				29,394
Capital Leases, Future Minimum Payments Due in Four Years				29,982
Capital Leases, Future Minimum Payments Due in Five Years				30,582
Capital Leases, Future Minimum Payments Due Thereafter				1,805,048
Capital Leases, Future Minimum Payments Due				1,952,077
Capital Leases, Future Minimum Payments, Interest Included in Payments				(1,611,816)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments				340,261
Operating Lease, Liability, Current	35,700	35,700	34,900
Operating Lease, Right-of-Use Asset	227,394	227,394	$ 225,600	$ 0	$ 0
Canyons Obligation [Member]
Amortization of the finance ROU assets		60,900
Operating Lease, Right-of-Use Asset	$ 122,700	$ 122,700
Maximum [Member]
Lessee Operating And Finance Lease Term		60 years
Minimum [Member]
Lessee Operating And Finance Lease Term		1 year