Mortgage Loans Held For Investment And Related Assets (Schedule Of Credit Quality Indicators And Portfolio Balance) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 516,509	$ 572,974
Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	351,887
Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	164,622
Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	235,502
Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	28,413
Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	209,491
Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	43,103
Internal Risk Rating, High [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	129,745
Internal Risk Rating, Medium [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	194,377
Internal Risk Rating, Low [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	192,387
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	324,122
Purchased From SCC [Member] \| Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	229,463
Purchased From SCC [Member] \| Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	94,659
Purchased From SCC [Member] \| Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	95,323
Purchased From SCC [Member] \| Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	8,414
Purchased From SCC [Member] \| Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	189,698
Purchased From SCC [Member] \| Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	30,687
Purchased From SCC [Member] \| Internal Risk Rating, High [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	129,745
Purchased From SCC [Member] \| Internal Risk Rating, Medium [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	194,377
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	192,387
All Other [Member] \| Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	122,424
All Other [Member] \| Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	69,963
All Other [Member] \| Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	140,179
All Other [Member] \| Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	19,999
All Other [Member] \| Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	19,793
All Other [Member] \| Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	12,416
All Other [Member] \| Internal Risk Rating, Low [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 192,387