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Stockholders' Equity (Summary Of Share Repurchase And Retirements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jul. 31, 2012	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2010
Stockholders' Equity [Abstract]
Retirement of common shares, Shares	21,300	14,554	18,950	12,786
Share repurchase and retired, value	$ 315,000	$ 199,989	$ 279,947	$ 250,003

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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