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Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($)
$ in Thousands
Jan. 31, 2021
Apr. 30, 2020
Finance Leases:    
Property and equipment, at cost $ 4,714 $ 4,281
Accumulated depreciation (2,276) (1,485)
Property and equipment, net 2,438 $ 2,796
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]   us-gaap:PropertyPlantAndEquipmentNet
Other accrued liabilities 1,042 $ 1,241
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]   us-gaap:OtherAccruedLiabilitiesCurrent
Other liabilities 1,499 $ 1,634
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]   us-gaap:OtherLiabilitiesNoncurrent
Total finance lease liabilities $ 2,541 $ 2,875
Weighted average remaining lease terms:    
Operating leases 5 years 2 months 12 days 5 years 6 months
Finance leases 2 years 9 months 18 days 2 years 10 months 24 days
Weighted average discount rate:    
Operating leases 4.80% 4.80%
Finance leases 4.20% 4.10%