Assets And Liabilities Measured At Fair Value (Fair Value Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Assets And Liabilities Measured At Fair Value [Abstract]
Mortgage loans held for investment, carrying amount	$ 450,137	$ 485,008
Deposits, carrying amount	733,887
Long-term borrowings, carrying amount	1,039,931
FHLB advances, carrying amount	25,000	25,000
Mortgage loans held for investment, estimated fair value	271,634
Deposits, estimated fair value	735,264
Long-term borrowings, estimated fair value	1,076,256
FHLB advances, estimated fair value	$ 24,997