Income Taxes (Schedule Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
CURRENT EXPENSE
Federal	$ 12,663	$ 4,825	$ 1,031
State	1,890	406	162
Total current expense	14,553	5,231	1,193
DEFERRED EXPENSE
Federal	3,024	6,076	4,859
State	1,311	1,902	930
Total deferred expense	4,335	7,978	5,789
Total expense	18,888	13,209	6,982
Other comprehensive income (loss)	(9,510)	3,944	(2,905)
Total comprehensive income tax expense	$ 9,378	$ 17,153	$ 4,077