Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Deferred tax assets:
Accrued expenses	$ 4,646	$ 4,479
Deferred revenue	11,082	9,603
Allowance for credit losses and related reserves	29,666	25,849
Internally-developed software	0	4,588
Deferred and stock-based compensation	6,669	5,970
Net operating loss carry-forward	86,213	72,618
Lease liabilities	126,505	0
Federal tax benefits related to state unrecognized tax benefits	16,729	20,141
Intangibles - intellectual property	85,688	93,300
Valuation allowance	(45,124)	(47,070)
Total deferred tax assets	322,074	189,478
Deferred tax liabilities:
Prepaid expenses and other	(5,189)	(8,592)
Lease right of use asset	(123,900)	0
Property and equipment	(12,221)	(9,726)
Intangibles	(64,252)	(59,477)
Total deferred tax liabilities	(205,562)	(77,795)
Net deferred tax assets	116,512	111,683
Deferred income tax assets	138,527	130,609
Deferred tax liabilities	$ (22,015)	$ (18,926)