Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Income Tax Disclosure [Abstract]
Accrued expenses	$ 34,052	$ 15,842
Allowance for credit losses and related reserves	115,145	114,570
Capital loss carryover	0	45,826
Valuation allowance	(10,837)	(28,088)
Current	138,360	148,150
Deferred and stock-based compensation	21,348	20,758
Deferred revenue	8,090	30,225
Net operating loss carry-forward	21,434	20,070
Federal tax benefits related to state unrecognized tax benefits	28,601	30,374
Capital loss carryover	0	2,379
Other	9,861	3,901
Valuation allowance	(8,339)	(26,525)
Noncurrent	80,995	81,182
Deferred tax asset	219,355	229,332
Prepaid expenses	(3,033)	(2,830)
Current	(3,033)	(2,830)
Property and equipment	(28,610)	(25,794)
Mortgage-related investment	(15,441)	(20,033)
Intangibles	(59,881)	(36,565)
Noncurrent	(103,932)	(82,392)
Net deferred tax assets	$ 112,390	$ 144,110