Mortgage Loans Held For Investment And Related Assets (Narrative) (Details)	12 Months Ended
	Apr. 30, 2014
Mortgage Loans Held For Investment And Related Assets [Line Items]
Allowance as Percent of Principal	4.10%
Percentage of mortgage loan portfolio consisting of borrowers from Florida, California, New York, and Wisconsin	51.00%
Minimum Credit Score
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loan-to-value at origination in order to have internal risk rating of medium	80.00%
Minimum credit score to be given internal risk rating of low	700
Maximum Credit Score
Mortgage Loans Held For Investment And Related Assets [Line Items]
Loan-to-value at origination in order to have internal risk rating of medium	80.00%
Maximum credit score to be given internal risk rating of medium	700
Maximum [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Mortgage loan's past due, in days	180 days
Allowance for Credit Losses, Period at Which Collectively Evaluated for Impairment	60 days
Minimum [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Mortgage loan's past due, in days	60 days
Allowance for Credit Losses, Period at Which Indivudally Evaluated for Impairment	60 days