Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Oct. 31, 2014
Cash dividends paid, per share	$ 0.23
Stock options exercised, shares	22,825
Treasury stock, shares	1,159
Common Stock [Member]
Stock options exercised, shares	22,825
Additional Paid-in Capital [Member]
Stock options exercised, shares	22,825
Treasury Stock [Member]
Stock options exercised, shares	22,825
Treasury stock, shares	1,159
Retained Earnings [Member]
Cash dividends paid, per share	$ 0.23