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Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Cash dividends paid, per share	$ 0.47	$ 0.44	$ 0.40
Stock options exercised, shares	29,075	97,250	26,750
Treasury stock, shares	1,159	69,773	13,752
Common Stock [Member]
Stock options exercised, shares	29,075	97,250	26,750
Additional Paid-in Capital [Member]
Stock options exercised, shares	29,075	97,250	26,750
Treasury Stock [Member]
Stock options exercised, shares	29,075	97,250	26,750
Treasury stock, shares	1,159	69,773	13,752
Retained Earnings [Member]
Cash dividends paid, per share	$ 0.47	$ 0.44	$ 0.40

X

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Aggregate dividends paid during the period for each share of common stock outstanding.

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