Interest Income And Expense (Interest Income And Expense Of Continuing Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Interest income	$ 9,921	$ 10,497	$ 20,261	$ 20,654
Interest expense	22,873	22,992	45,809	45,887
Mortgage Loans [Member]
Interest income	5,151	6,525	10,812	12,848
Interest Income Other [Member]
Interest income	4,770	3,972	9,449	7,806
Borrowings [Member]
Interest expense	21,114	20,649	42,243	41,225
Deposits [Member]
Interest expense	1,608	1,947	3,264	3,870
FHLB Advances [Member]
Interest expense	$ 151	$ 396	$ 302	$ 792