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Litigation And Related Contingencies (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jan. 31, 2012
Apr. 30, 2011
Loss Contingencies [Line Items]    
Accrued obligations under indemnifications $ 89.0 $ 70.6
Liability for legal claims 142.9  
Claims for severance benefits 8  
Expected payment for settlement of litigation, maximum 35.0  
Investigation settlement amount 28  
Litigation settlement amount 41.5  
Pending Or Threatened Litigation [Member]
   
Loss Contingencies [Line Items]    
Initial principal on loans securitized 50  
Principal outstanding on loans securitized 41  
Minimum [Member] | Investigations, Legal Claims And Lawsuits [Member]
   
Loss Contingencies [Line Items]    
Liability for legal claims 0  
Maximum [Member] | Investigations, Legal Claims And Lawsuits [Member]
   
Loss Contingencies [Line Items]    
Liability for legal claims $ 61.0