Leases - Reconciliation of Future Undiscounted Cash Flows to Operating and Finance Leases (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020
Operating leases
2021	$ 12,157
2022	21,928
2023	21,250
2024	19,345
2025	17,157
Thereafter	57,709
Total lease payments	149,546
Less imputed interest	(16,516)
Operating lease liabilities	133,030
Current maturities	(19,519)	$ (18,896)
Long-term lease liability - operating	113,511	112,454
Lease assets	128,125	$ 127,668
Financing leases
2021	1,247
2022	1,766
2023	1,300
2024	1,001
2025	318
Thereafter	92
Total lease payments	5,724
Less imputed interest	(259)
Finance Lease, Liability	5,465
Current maturities	(2,140)
Lease liability - long-term	3,325
Lease assets	$ 10,013