Income Taxes (Schedule Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
CURRENT EXPENSE
Federal	$ 29,072	$ 25,649	$ 8,668
State	7,581	8,231	1,290
Foreign	533	1,125	257
Total current expense	37,186	35,005	10,215
DEFERRED EXPENSE
Federal	(7,167)	(4,498)	17,833
State	(4,190)	(3,266)	3,642
Deferred Foreign Income Tax Expense (Benefit)	(142)	(41)	(71)
Total deferred (benefit) expense	(11,499)	(7,805)	21,404
Total expense	25,687	27,200	31,619
Other comprehensive income (loss)	(573)	190	50
Total comprehensive income tax expense	$ 25,114	$ 27,390	$ 31,669