Mortgage Loans Held For Investment And Related Assets (Narrative) (Details)	Jul. 31, 2015	Apr. 30, 2015	Jul. 31, 2014
Mortgage Loans Held For Investment And Related Assets [Line Items]
Allowance as Percent of Principal	3.20%	3.20%	3.90%

Mortgage Loans Held For Investment And Related Assets [Line Items]

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