Fair Value Measurement (Assets Remeasured At Fair Value On Non-Recurring Basis) (Details) (Non-Recurring, USD $) In Thousands, unless otherwise specified	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss, REO	$ (300)	$ (203)
Loss, Impaired mortgage loans held for investment	(2,353)	(7,298)
Total, Gain (loss) on financial instruments	(2,653)	(7,501)
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
REO	7,519	14,646
Impaired mortgage loans held for investment	76,148	89,032
Total financial assets at fair value	83,667	103,678
As a percentage of total assets	2.60%	2.70%
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
REO	0	0
Impaired mortgage loans held for investment	0	0
Total financial assets at fair value	0	0
As a percentage of total assets	0.00%	0.00%
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
REO	0	0
Impaired mortgage loans held for investment	0	0
Total financial assets at fair value	0	0
As a percentage of total assets	0.00%	0.00%
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
REO	7,519	14,646
Impaired mortgage loans held for investment	76,148	89,032
Total financial assets at fair value	$ 83,667	$ 103,678
As a percentage of total assets	2.60%	2.70%