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Assets And Liabilities Measured At Fair Value (Fair Value Of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Apr. 30, 2011	Jan. 31, 2011
Assets And Liabilities Measured At Fair Value [Abstract]
Mortgage loans held for investment, Carrying Amount	$ 430,189	$ 485,008
Deposits, Carrying Amount	1,593,604
Long-term borrowings, Carrying Amount	1,040,237	1,040,084	1,039,788
Mortgage loans held for investment, Estimated Fair Value	260,691
Deposits, Estimated Fair Value	1,585,985
Long-term borrowings, Estimated Fair Value	$ 1,078,152

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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