Leases - Narrative (Details) $ in Millions	3 Months Ended
	Oct. 31, 2020 USD ($) option_to_extend
Lessee, Lease, Description [Line Items]
Number of options to extend | option_to_extend	1
Option to extend operating leases	10 years
Option to extend sublease	5 years
Leases not yet commenced | $	$ 48
Minimum
Lessee, Lease, Description [Line Items]
Terms for leases not yet commenced	3 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease terms	10 years
Operating sublease terms	4 years
Terms for leases not yet commenced	11 years