Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit) For Continuing Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Current:
Federal	$ 74,993	$ (53,630)	$ 147,961
State	12,345	25,240	15,118
Foreign	6,711	9,953	10,678
Current income tax expense (benefit)	94,049	(18,437)	173,757
Deferred:
Federal	6,625	50,505	39,299
State	(1,070)	24,666	(5,064)
Foreign	300	(14,911)	378
Deferred taxes	5,855	60,260	34,613
Total income taxes for continuing operations	$ 99,904	$ 41,823	$ 208,370

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