Leases - Narrative (Details) - Real Estate	3 Months Ended
	Oct. 31, 2020 contract
Lessee, Lease, Description [Line Items]
Number of lease contracts (in contracts)	90
Minimum
Lessee, Lease, Description [Line Items]
Lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term	16 years