Mortgage Loans Held For Investment And Related Assets (Narrative) (Details)	Jan. 31, 2016	Apr. 30, 2015	Jan. 31, 2015
Mortgage Loans Held For Investment And Related Assets [Line Items]
Allowance as Percent of Principal	3.20%	3.20%	3.70%

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

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