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Investments In Available-For-Sale Securities (Narrative) (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	Apr. 30, 2011
Investments In Available-For-Sale Securities [Abstract]
Investments in available-for-sale securities, continuous loss position, gross unrealized losses	$ 0		$ 0		$ 0
Other-than-temporary impairments of AFS securities	$ 0	$ 100	$ 0	$ 300

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities.

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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