Mortgage Loans Held For Investment And Related Assets (Schedule Of Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Loans and Leases Rollforward [Roll Forward]
Balance at beginning of the period	$ 11,272	$ 14,314
Provision	735	7,224
Recoveries	911	2,409
Charge-offs	(3,157)	(11,243)
Balance at end of the period	$ 9,761	$ 12,704