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Mortgage Loans Held For Investment And Related Assets (Information Related To Impaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2012
Apr. 30, 2011
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance $ 255,593 $ 268,649
Related Allowance 80,482 80,849
Purchased From SCC [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance 220,448 232,061 [1]
Related Allowance 71,084 71,733 [1]
All Other [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance 35,145 36,588 [1]
Related Allowance 9,398 9,116 [1]
Portfolio Balance With No Allowance [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance 50,427 59,235
Portfolio Balance With No Allowance [Member] | Purchased From SCC [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance 40,672 51,674 [1]
Portfolio Balance With No Allowance [Member] | All Other [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance 9,755 7,561 [1]
Portfolio Balance With Allowance [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance 205,166 209,414
Portfolio Balance With Allowance [Member] | Purchased From SCC [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance 179,776 180,387 [1]
Portfolio Balance With Allowance [Member] | All Other [Member]
    
Mortgage Loans Held For Investment And Related Assets [Line Items]    
Portfolio Balance $ 25,390 $ 29,027 [1]
[1] Classification of amounts as of April 30, 2011 has been restated to conform to the current period presentation.