Leases - Other information (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Finance leases included in property and equipment
Property and equipment	$ 176,591	$ 171,380
Accumulated depreciation	(51,869)	(41,737)
Property and equipment, net	$ 124,722	$ 129,643
Finance lease, right-of-use asset, balance sheet location [Extensible List]	Property and equipment, net of accumulated depreciation of $193,364 and $158,554, respectively	Property and equipment, net of accumulated depreciation of $193,364 and $158,554, respectively
Weighted-average remaining lease term (years)
Operating leases	4 years 8 months 12 days	4 years 10 months 24 days
Finance leases	3 years 6 months	3 years 7 months 6 days
Weighted-average discount rate
Operating leases	5.50%	5.50%
Finance leases	4.60%	5.00%