Leases - Other information (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
Finance leases included in property and equipment
Property and equipment	$ 175,852	$ 176,591
Accumulated depreciation	(53,609)	(51,869)
Property and equipment, net	$ 122,243	$ 124,722
Finance lease, right-of-use asset, balance sheet location [Extensible List]	Property and equipment, net of accumulated depreciation of $201,441 and $193,364, respectively	Property and equipment, net of accumulated depreciation of $201,441 and $193,364, respectively
Weighted-average remaining lease term (years)
Operating leases	4 years 8 months 12 days	4 years 8 months 12 days
Finance leases	3 years 6 months	3 years 6 months
Weighted-average discount rate
Operating leases	5.20%	5.50%
Finance leases	4.60%	4.60%