Leases - Reconciliation of Future Undiscounted Cash Flows to Operating and Finance Leases (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Apr. 30, 2019
Operating leases
2020	$ 18,174
2021	21,854
2022	14,837
2023	11,251
2024	10,410
Thereafter	34,881
Total lease payments	111,407
Less imputed interest	(14,847)
Total lease liability	96,560
Current maturities	(20,289)	$ 0
Lease liability - long-term	76,271	0
Lease assets	95,285	$ 0
Financing leases
2020	1,927
2021	2,089
2022	1,149
2023	779
2024	763
Thereafter	176
Total lease payments	6,883
Less imputed interest	(342)
Finance Lease, Liability	6,541
Current maturities	(2,352)
Lease liability - long-term	4,189
Lease assets	$ 10,810