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Leases Supplemental Cash Flow Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating cash flows related to operating leases $ 7,856 $ 7,753
Operating cash flows related to finance leases 21 7
Financing cash flows related to finance leases 327 0
Right-of-use assets obtained in exchange for new operating lease liabilities 5,672 9,009
Right-of-use assets obtained in exchange for new finance lease liabilities $ 15,761 0
Technology Equipment    
Lessee, Lease, Description [Line Items]    
Financing cash flows related to finance leases   $ 159