Acquisitions (Details 3) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Business acquisition pro-forma information
Net sales	$ 1,952.0	$ 1,323.8
Net income	$ 136.4	$ 116.0
Net income per common share - assuming dilution	$ 1.14	$ 1.14
Big Heart [Member]
Business acquisition pro-forma information
Net sales	$ 561.3	$ 1,853.5
Net income		$ 122.4
Net income per common share - assuming dilution		$ 1.02