Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Income Tax Disclosure [Abstract]
Document Fiscal Year Focus	2017
Accrued expenses	$ 4,491	$ 7,919
Deferred Tax Assets, Deferred Income	36,305	35,066
Allowance for credit losses and related reserves	39,243	69,347
Deferred Tax Assets, Goodwill and Intangible Assets	55,253	51,998
Deferred and stock-based compensation	17,919	19,075
Net operating loss carry-forward	28,049	26,992
Federal tax benefits related to state unrecognized tax benefits	36,265	31,123
Other	0	10,187
Deferred Tax Assets, Valuation Allowance	(22,844)	(21,515)
Total deferred tax assets	194,681	230,192
Prepaid expenses and other	(12,104)	(3,225)
Property and equipment	(10,024)	(19,913)
Intangibles	(95,385)	(93,406)
Total deferred tax liabilities	117,513	116,544
Total deferred tax liabilities	(159,085)	(132,960)
Net deferred tax assets	$ 77,168	$ 113,648