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Interest Income And Expense (Schedule Of Interest Income And Expense Of Continuing Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Schedule Of Interest Income And Expense [Line Items]        
Interest income $ 39,476 $ 56,012 $ 59,737 $ 76,666
Interest expense 23,543 24,662 69,352 70,549
Emerald Advance Lines Of Credit [Member]
        
Schedule Of Interest Income And Expense [Line Items]        
Interest income 30,062 46,132 30,297 47,590
Mortgage Loans [Member]
        
Schedule Of Interest Income And Expense [Line Items]        
Interest income 4,948 5,923 15,760 18,771
Interest Income Other [Member]
        
Schedule Of Interest Income And Expense [Line Items]        
Interest income 4,466 3,957 13,680 10,305
Borrowings [Member]
        
Schedule Of Interest Income And Expense [Line Items]        
Interest expense 21,382 21,678 63,625 62,903
Deposits [Member]
        
Schedule Of Interest Income And Expense [Line Items]        
Interest expense 2,011 2,587 5,275 6,457
FHLB Advances [Member]
        
Schedule Of Interest Income And Expense [Line Items]        
Interest expense $ 150 $ 397 $ 452 $ 1,189