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Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Consolidated Statements Of Shareholders' Equity [Abstract]
Payment of dividends per share	$ 0.60	$ 0.505	$ 0.34
Exercise of stock options, shares	159,600	184,441	83,450
Repurchase of common stock, shares		13,157,894

Number of share options (or share units) exercised during the current period.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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