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Common Shares (Details)	Jan. 31, 2012	Apr. 30, 2011
Common Shares Information
Common Shares authorized	150,000,000	150,000,000
Common shares outstanding	113,255,750	114,172,122
Treasury shares	15,349,415	14,432,043

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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