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Reportable Segments (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Net sales:      
Net sales $ 5,692.7 $ 5,610.6 $ 5,897.7
Assets:      
Assets 16,882.6 9,060.2 9,024.1
Segment Reporting Information [Line Items]      
Total long-lived assets (excluding goodwill and other intangible assets) 1,870.2 1,398.6 1,286.6
United States [Member]      
Net sales:      
Net sales 5,188.5 5,092.0 5,355.9
Assets:      
Assets 16,407.0 8,638.6 8,577.7
Long-lived assets (excluding goodwill and other intangible assets):      
Long-lived assets 1,815.0 1,343.2 1,227.0
Canada [Member]      
Net sales:      
Net sales 413.8 437.2 459.5
Assets:      
Assets 362.1 257.7 396.3
Long-lived assets (excluding goodwill and other intangible assets):      
Long-lived assets 14.3 16.5 20.6
All other international [Member]      
Net sales:      
Net sales 90.4 81.4 82.3
Assets:      
Assets 113.5 163.9 50.1
Long-lived assets (excluding goodwill and other intangible assets):      
Long-lived assets 40.9 38.9 39.0
Total international [Member]      
Net sales:      
Net sales 504.2 518.6 541.8
Assets:      
Assets 475.6 421.6 446.4
Long-lived assets (excluding goodwill and other intangible assets):      
Long-lived assets $ 55.2 $ 55.4 $ 59.6