Leases Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Lessee, Lease, Description [Line Items]
Operating cash flows related to operating leases	$ 29,799
Operating cash flows related to finance leases	187
Financing cash flows related to finance leases	1,065	$ 0	$ 0
Right-of-use assets obtained in exchange for new operating lease liabilities	42,860
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 2,899