Mortgage Loans Held For Investment And Related Assets (Schedule Of Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	$ 385,867	$ 429,312
Occupancy Status, Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	266,882
Occupancy Status, Non-Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	118,985
Documentation Level, Full Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	192,372
Documentation Level, Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	24,243
Documentation Level, Stated Income [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	139,391
Documentation Level, No Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	29,861
Internal Risk Rating, High [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	72,880
Internal Risk Rating, Medium [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	148,184
Internal Risk Rating, Low [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	164,803
Purchased From SCC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	221,064
Purchased From SCC [Member] | Occupancy Status, Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	161,298
Purchased From SCC [Member] | Occupancy Status, Non-Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	59,766
Purchased From SCC [Member] | Documentation Level, Full Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	72,086
Purchased From SCC [Member] | Documentation Level, Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	7,003
Purchased From SCC [Member] | Documentation Level, Stated Income [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	122,577
Purchased From SCC [Member] | Documentation Level, No Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	19,398
Purchased From SCC [Member] | Internal Risk Rating, High [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	72,880
Purchased From SCC [Member] | Internal Risk Rating, Medium [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	148,184
All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	164,803
All Other [Member] | Occupancy Status, Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	105,584
All Other [Member] | Occupancy Status, Non-Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	59,219
All Other [Member] | Documentation Level, Full Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	120,286
All Other [Member] | Documentation Level, Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	17,240
All Other [Member] | Documentation Level, Stated Income [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	16,814
All Other [Member] | Documentation Level, No Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	10,463
All Other [Member] | Internal Risk Rating, Low [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Portfolio	$ 164,803