Goodwill And Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization	$ 17.9	$ 13.2	$ 34.5	$ 24.5
Estimated amortization, 2015	31.1		31.1
Estimated amortization, 2016	68.8		68.8
Estimated amortization, 2017	61.9		61.9
Estimated amortization, 2018	54.2		54.2
Estimated amortization, 2019	$ 42.2		$ 42.2