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Stock Split (Details) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2013
Common stock, Class A, voting [Member]
Change in the company's outstanding shares
Balance at April 30, 2012	56,251
Stock split (3-for-2)	28,149
Stock issued under compensation plans	46
Balance at January 31, 2013	84,446
Common stock, Class B, nonvoting [Member]
Change in the company's outstanding shares
Balance at April 30, 2012	85,823
Stock split (3-for-2)	42,951
Stock issued under compensation plans	391
Balance at January 31, 2013	129,165

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

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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