Leases - Maturities of Operating and FInance Lease Liability Payments (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Apr. 30, 2020
Leases [Abstract]
2020	$ 2,955
2021	10,422
2022	8,444
2023	6,806
2024	4,934
Thereafter	40,562
Total lease payments	74,123
Less: imputed interest	20,866
Total lease liabilities	$ 53,257
Operating lease payments		$ 18,778