Mortgage Loans Held For Investment And Related Assets (Narrative) (Details)	Oct. 31, 2016	Apr. 30, 2016	Oct. 31, 2015
Mortgage Loans Held For Investment And Related Assets [Abstract]
Allowance as Percent of Principal	2.90%	2.70%	3.30%

Mortgage Loans Held For Investment And Related Assets [Abstract]

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