Mortgage Loans Held For Investment And Related Assets (Schedule Of Credit Quality Indicators And Portfolio Balance) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	$ 537,754	$ 572,974
Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	365,342
Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	172,412
Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	246,467
Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	30,537
Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	216,621
Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	44,129
Internal Risk Rating, High [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	136,885
Internal Risk Rating, Medium [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	199,804
Internal Risk Rating, Low [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	201,065
Purchased From SCC [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	336,689
Purchased From SCC [Member] | Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	238,204
Purchased From SCC [Member] | Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	98,485
Purchased From SCC [Member] | Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	100,555
Purchased From SCC [Member] | Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	8,707
Purchased From SCC [Member] | Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	196,106
Purchased From SCC [Member] | Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	31,321
Purchased From SCC [Member] | Internal Risk Rating, High [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	136,885
Purchased From SCC [Member] | Internal Risk Rating, Medium [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	199,804
All Other [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	201,065
All Other [Member] | Occupancy Status, Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	127,138
All Other [Member] | Occupancy Status, Non-Owner Occupied [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	73,927
All Other [Member] | Documentation Level, Full Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	145,912
All Other [Member] | Documentation Level, Limited Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	21,830
All Other [Member] | Documentation Level, Stated Income [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	20,515
All Other [Member] | Documentation Level, No Documentation [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	12,808
All Other [Member] | Internal Risk Rating, Low [Member]
Mortgage Loans Held For Investment And Related Assets [Line Items]
Portfolio balance	$ 201,065