Mortgage Loans Held For Investment And Related Assets (Schedule Of Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 405,670	$ 429,312
Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	278,690
Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	126,980
Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	200,770
Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	24,830
Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	149,080
Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	30,990
Internal Risk Rating, High [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	80,268
Internal Risk Rating, Medium [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	153,772
Internal Risk Rating, Low [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	171,630
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	234,040
Purchased From SCC [Member] | Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	168,756
Purchased From SCC [Member] | Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	65,284
Purchased From SCC [Member] | Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	74,959
Purchased From SCC [Member] | Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	7,080
Purchased From SCC [Member] | Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	131,633
Purchased From SCC [Member] | Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	20,368
Purchased From SCC [Member] | Internal Risk Rating, High [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	80,268
Purchased From SCC [Member] | Internal Risk Rating, Medium [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	153,772
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	171,630
All Other [Member] | Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	109,934
All Other [Member] | Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	61,696
All Other [Member] | Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	125,811
All Other [Member] | Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	17,750
All Other [Member] | Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	17,447
All Other [Member] | Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	10,622
All Other [Member] | Internal Risk Rating, Low [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Total Portfolio	$ 171,630