Reportable Segments (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Geographical information [Line Items]
Net sales	$ 2,034.0	$ 1,957.8	$ 4,005.8	$ 3,736.7
United States
Geographical information [Line Items]
Net sales	1,882.2	1,815.9	3,711.9	3,473.5
Total international
Geographical information [Line Items]
Net sales	151.8	141.9	293.9	263.2
Canada
Geographical information [Line Items]
Net sales	123.2	113.4	231.4	210.2
All other international
Geographical information [Line Items]
Net sales	$ 28.6	$ 28.5	$ 62.5	$ 53.0