Mortgage Loans Held For Investment And Related Assets (Schedule Of Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Apr. 30, 2014	Jan. 31, 2014
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 252,965	$ 277,423	$ 291,325
Occupancy Status, Owner Occupied
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	178,251
Occupancy Status, Non-Owner Occupied
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	74,714
Documentation Level, Full Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	123,409
Documentation Level, Limited Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	16,352
Documentation Level, Stated Income
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	94,109
Documentation Level, No Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	19,095
Internal Risk Rating, High
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	41,216
Internal Risk Rating, Medium
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	104,596
Internal Risk Rating, Low
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	107,153
Purchased From SCC
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	145,812
Purchased From SCC | Occupancy Status, Owner Occupied
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	107,581
Purchased From SCC | Occupancy Status, Non-Owner Occupied
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	38,231
Purchased From SCC | Documentation Level, Full Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	47,314
Purchased From SCC | Documentation Level, Limited Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	4,607
Purchased From SCC | Documentation Level, Stated Income
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	82,252
Purchased From SCC | Documentation Level, No Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	11,639
Purchased From SCC | Internal Risk Rating, High
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	41,216
Purchased From SCC | Internal Risk Rating, Medium
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	104,596
All Other
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	107,153
All Other | Occupancy Status, Owner Occupied
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	70,670
All Other | Occupancy Status, Non-Owner Occupied
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	36,483
All Other | Documentation Level, Full Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	76,095
All Other | Documentation Level, Limited Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	11,745
All Other | Documentation Level, Stated Income
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	11,857
All Other | Documentation Level, No Documentation
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	7,456
All Other | Internal Risk Rating, Low
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 107,153