Net Earnings Per Share (Narrative) (Details)	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Earnings Per Share [Abstract]
Shares of its common stock repurchased	33,326		163,326
Potentially dilutive securities	0	100,000	200,000	100,000