Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Accrued expenses	$ 4,479	$ 3,847
Deferred revenue	9,603	9,482
Allowance for credit losses and related reserves	25,849	25,058
Internally-developed software	4,588	15,741
Deferred and stock-based compensation	5,970	4,526
Net operating loss carry-forward	72,618	69,567
Federal tax benefits related to state unrecognized tax benefits	20,141	15,738
Intangibles - intellectual property	93,300	0
Valuation allowance	(47,070)	(49,215)
Total deferred tax assets	189,478	94,744
Prepaid expenses and other	(8,592)	(8,986)
Property and equipment	(9,726)	(7,944)
Intangibles	(59,477)	(61,226)
Total deferred tax liabilities	(77,795)	(78,156)
Net deferred tax assets	111,683	16,588
Deferred income tax assets	130,609	29,455
Deferred tax liabilities	$ (18,926)	$ (12,867)