Leases - Summary of Information Related to Remaining Lease Term and Discount Rate (Details)	Jul. 31, 2020	Jul. 31, 2019
Leases [Abstract]
Weighted average remaining lease term, Operating leases (in years)	6 years 1 month 13 days	7 years 14 days
Weighted average remaining lease term, Finance leases (in years)	2 years 8 months 15 days	2 years 11 months 26 days
Weighted average discount rate, Operating leases	5.27%	5.40%
Weighted average discount rate, Finance leases	4.43%	3.93%