Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit) For Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Current:
Federal	$ 18,048	$ 74,993	$ (53,630)
State	(16,614)	12,345	25,240
Foreign	1,991	6,711	9,953
Current income tax expense (benefit)	3,425	94,049	(18,437)
Deferred:
Federal	1,703	6,625	50,505
State	(1,516)	(1,070)	24,666
Foreign	(13,142)	300	(14,911)
Deferred taxes	(12,955)	5,855	60,260
Total income tax expense (benefit)	$ (9,530)	$ 99,904	$ 41,823