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Common Shares (Details)	Oct. 31, 2012	Apr. 30, 2012
Common Shares Information
Common shares authorized	150,000,000	150,000,000
Common shares outstanding	108,458,847	110,284,715
Treasury shares	20,146,318	18,320,450

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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