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Leases - Summary of Information Related to Remaining Lease Term and Discount Rate (Details) | Apr. 30, 2020 | Apr. 30, 2019
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Leases [Abstract] |  |
Weighted average remaining lease term, Operating leases (in years) | 6 years 3 months 14 days | 7 years 2 months 19 days
Weighted average remaining lease term, Finance leases (in years) | 2 years 9 months 29 days | 2 years 11 months 8 days
Weighted average discount rate, Operating leases | 5.26% | 5.39%
Weighted average discount rate, Finance leases | 4.42% | 3.62%

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