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Commitments And Contingencies (Narrative) (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Oct. 31, 2010
Jul. 31, 2010
Apr. 30, 2010
Jan. 31, 2010
Oct. 31, 2009
Jul. 31, 2009
Jan. 31, 2012
Jan. 31, 2011
Apr. 30, 2011
Apr. 30, 2009
Apr. 30, 2007
Apr. 30, 2006
Apr. 30, 2005
Commitments And Contingencies [Line Items]                                      
Standard guarantee accrual amount   $ 12,500,000     $ 14,700,000               $ 12,500,000   $ 14,700,000        
Contingent business acquisition obligations   8,200,000     11,000,000               8,200,000   11,000,000        
Claims received for loans 1,344,000,000 35,000,000 483,000,000 31,000,000 55,000,000 33,000,000 21,000,000 109,000,000 45,000,000 11,000,000 83,000,000 6,000,000       432,000,000      
Percentage of denied loan repurchase claims received                         88.00%            
Percentage of valid claims that resulted in loan repurchases                         22.00%            
Percentage of valid claims that resulted in indemnification or settlement payments                         78.00%            
Losses incurred on claim settlements                         120,000,000            
Loss severity rates on repurchases and indemnification                         59.00%            
Net balance of all mortgage loans held for sale by SCC   10,600,000                     10,600,000            
Principal balance of warranty claims reviewed   220,000,000                                  
Estimated loss on valid warranty claims   1,200,000                                  
Claims subject to review by SCC, amount   399,000,000                     399,000,000            
Amount of claims under review representing requests for additions                         79,000,000            
Percentage of fraud on originated loans                           68.00%          
Percentage of loans originated in 2006 and 2007   90.00%                     90.00%            
Amount of loans originated during 2005 through 2007   84,000,000,000                     84,000,000,000            
Percentage of loans issued to government sponsored entities, maximum   1.00%                     1.00%            
Value of loans which have defaulted in the first two years                                 2,900,000,000 6,300,000,000 4,000,000,000
Reserve for losses on repurchases   142,923,000     126,260,000 154,986,000     188,200,000       142,923,000 154,986,000 126,260,000        
Estimated contingent losses   142,900,000                     142,900,000            
Payments under indemnity agreement                           (25,562,000) 49,800,000        
Loss severity rate, assumed   1.00%                     1.00%            
Increase in losses due to assumed 1% increase in validity rates and loss severities   35,000,000                                  
Private-Label Securitization Transactions [Member]
                                      
Commitments And Contingencies [Line Items]                                      
Claims received for loans   29,000,000                                  
Monoline Insurers [Member]
                                      
Commitments And Contingencies [Line Items]                                      
Claims received for loans   6,000,000                                  
2005 [Member]
                                      
Commitments And Contingencies [Line Items]                                      
Claims received for loans 89,000,000 4,000,000     1,000,000   1,000,000 6,000,000     15,000,000         62,000,000      
2006 [Member]
                                      
Commitments And Contingencies [Line Items]                                      
Claims received for loans 707,000,000 29,000,000 130,000,000 29,000,000 50,000,000 29,000,000 15,000,000 100,000,000 45,000,000 4,000,000 57,000,000 2,000,000       217,000,000      
2007 [Member]
                                      
Commitments And Contingencies [Line Items]                                      
Claims received for loans $ 548,000,000 $ 2,000,000 $ 353,000,000 $ 2,000,000 $ 4,000,000 $ 4,000,000 $ 5,000,000 $ 3,000,000   $ 7,000,000 $ 11,000,000 $ 4,000,000       $ 153,000,000      
Minimum [Member]
                                      
Commitments And Contingencies [Line Items]                                      
Number of days to respond to representation and warranty claims, in days                         60            
Maximum [Member]
                                      
Commitments And Contingencies [Line Items]                                      
Number of days to respond to representation and warranty claims, in days                         120