Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Income Tax Disclosure [Abstract]
Document Fiscal Year Focus	2016
Accrued expenses	$ 7,919	$ 9,301
Deferred Tax Assets, Deferred Income	35,066	39,604
Allowance for credit losses and related reserves	69,347	107,554
Deferred Tax Assets, Goodwill and Intangible Assets	51,998	46,376
Deferred and stock-based compensation	19,075	21,776
Net operating loss carry-forward	26,992	27,285
Federal tax benefits related to state unrecognized tax benefits	31,123	26,862
Other	10,187	7,278
Deferred Tax Assets, Valuation Allowance	(21,515)	(24,937)
Total deferred tax assets	230,192	261,099
Prepaid expenses and other	(3,225)	(7,295)
Property and equipment	(19,913)	(25,589)
Intangibles	(93,406)	(93,700)
Total deferred tax liabilities	116,544	126,584
Total deferred tax liabilities	(132,960)	(142,586)
Net deferred tax assets	$ 113,648	$ 134,515