Leases - Reconciliation of Future Undiscounted Cash Flows to Operating and Finance Leases (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Apr. 30, 2020
Operating leases
2020	$ 18,080
2021	20,889
2022	19,870
2023	17,977
2024	15,859
Thereafter	55,609
Total lease payments	148,284
Less imputed interest	(17,628)
Total lease liability	130,656
Current maturities	(19,566)	$ (18,896)
Lease liability - long-term	111,090	112,454
Lease assets	126,409	$ 127,668
Financing leases
2020	1,759
2021	1,508
2022	1,041
2023	864
2024	267
Thereafter	71
Total lease payments	5,510
Less imputed interest	(255)
Finance Lease, Liability	5,255
Current maturities	(2,087)
Lease liability - long-term	3,168
Lease assets	$ 9,782