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Divestiture (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Apr. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from divestiture   $ 372.1 $ 0.0  
Gain on divestiture   26.6 $ 0.0  
U.S. Baking Business [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Annual net sales       $ 370.0
Proceeds from divestiture $ 372.1 372.1    
U.S. Baking Business [Member] | Other Operating Income (Expense) [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on divestiture $ 26.6 $ 26.6