Leases - Narrative (Details) $ in Millions	6 Months Ended
	Jan. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Option to extend operating leases	10 years
Option to extend operating subleases	4 years
Leases not yet commenced	$ 27
Minimum
Lessee, Lease, Description [Line Items]
Terms for leases not yet commenced	3 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease terms	11 years
Operating sublease terms	5 years
Terms for leases not yet commenced	10 years