Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Loans and Leases Rollforward [Roll Forward]
Balance as of the beginning of the year	$ 14,314	$ 26,540	$ 92,087
Provision	8,271	13,283	24,075
Recoveries	4,040	3,338	292
Charge-offs	(15,353)	(28,847)	(89,914)
Balance as of the end of the year	$ 11,272	$ 14,314	$ 26,540