Interest Income And Expense (Interest Income And Expense Of Continuing Operations) (Details) (USD $) In Thousands	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Interest income	$ 10,433	$ 10,302
Interest expense	23,301	22,962
Mortgage Loans [Member]
Interest income	5,661	6,323
Interest Income Other [Member]
Interest income	4,772	3,979
Borrowings [Member]
Interest expense	21,494	20,643
Deposits [Member]
Interest expense	1,656	1,923
FHLB Advances [Member]
Interest expense	$ 151	$ 396