Leases - Fiscal Year Maturity of Lease Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Operating Lease Maturities
2021	$ 24,071
2022	20,886
2023	19,870
2024	17,977
2025	15,859
Thereafter	55,609
Total lease payments	154,272
Less imputed interest	(22,922)
Total lease liability	131,350
Current maturities	(18,896)
Long-term lease liability - operating	112,454
Operating lease right-of-use assets	127,668
Finance Lease Maturities
2021	2,359
2022	1,423
2023	1,003
2024	858
2025	267
Thereafter	71
Total lease payments	5,981
Less imputed interest	(294)
Total lease liability	5,687	$ 6,600
Current maturities	(2,216)
Lease liability - long-term	3,471
Lease assets	$ 10,248