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Consolidated Balance Sheets (Parenthetical) - shares	Apr. 30, 2015	Apr. 30, 2014
Consolidated Balance Sheets [Abstract]
Serial preferred shares, no par value, shares authorized	6,000,000	6,000,000
Serial preferred shares, no par value, shares outstanding	0	0
Common shares, no par value, shares authorized	300,000,000	300,000,000
Common shares, no par value, shares outstanding	119,577,333	101,697,400
Treasury shares, shares outstanding	26,920,397	26,907,765

X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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-Name Accounting Standards Codification



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X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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X

- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

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X

- Definition

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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X

- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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