Investments In Available-For-Sale Securities (Contractual Maturities Of AFS Debt Securities At Varying Dates Over The Next 30 Years) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Oct. 31, 2012	Apr. 30, 2012
Investments In Available-For-Sale Securities [Abstract]
Span of contractual maturities of AFS debt securities	30 years
Contractual maturities of AFS debt securities Cost Basis, Less than one year	$ 1,003
Contractual maturities of AFS debt securities Cost Basis, Two to five years	4,207
Contractual maturities of AFS debt securities Cost Basis, More than five years	378,055
Contractual maturities of AFS debt securities Cost Basis, Total	383,265
Contractual maturities of AFS debt securities Fair Value, Less than one year	1,014
Contractual maturities of AFS debt securities Fair Value, Two to five years	4,578
Contractual maturities of AFS debt securities Fair Value, More than five years	384,062
Contractual maturities of AFS debt securities Fair Value, Total	$ 389,654	$ 372,352

Available-For-Sale Securities, Debt Maturities, More Than Five Years, Amortized Cost

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Available-For-Sale Securities, Debt Maturities, More Than Five Years, Fair Value

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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