Leases - Fiscal Year Maturity of Lease Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020
Operating Lease Maturities
2022	$ 23,761
2023	22,875
2024	20,881
2025	18,058
2026	17,852
Thereafter	40,881
Total lease payments	144,308
Less imputed interest	(14,686)
Total lease liability	129,622
Current maturities	(19,994)	$ (18,896)
Long-term lease liability - operating	109,628	112,454
Operating lease right-of-use assets	123,118	127,668
Finance Lease Maturities
2022	2,199
2023	1,732
2024	1,352
2025	339
2026	109
Thereafter	0
Total lease payments	5,731
Less imputed interest	(237)
Total lease liability	5,494	$ 5,700
Current maturities	(2,072)
Lease liability - long-term	3,422
Lease assets	$ 10,037