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Goodwill and Other Intangible Assets - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 01, 2020
reporting_unit
Jan. 31, 2020
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
Goodwill and Intangible Assets [Line Items]          
Amortization expense for finite-lived intangible assets     $ 235.3 $ 239.1 $ 204.8
Weighted-average useful life of the finite-lived intangible assets     23 years    
Estimated amortization expense for 2021     $ 238.7    
Estimated amortization expense for 2022     232.8    
Estimated amortization expense for 2023     225.5    
Estimated amortization expense for 2024     220.8    
Estimated amortization expense for 2025     217.3    
Goodwill     6,304.5 6,310.9 5,942.2
Number of reporting units | reporting_unit 6        
Goodwill impairment charges     0.0 97.9 [1] 145.0
Other intangible assets impairment charges     $ 52.4 107.2 31.9
Customer and Contractual Relationships [Member]          
Goodwill and Intangible Assets [Line Items]          
Weighted-average useful life of the finite-lived intangible assets     24 years    
Patents And Technology [Member]          
Goodwill and Intangible Assets [Line Items]          
Weighted-average useful life of the finite-lived intangible assets     15 years    
Trademarks [Member]          
Goodwill and Intangible Assets [Line Items]          
Weighted-average useful life of the finite-lived intangible assets     16 years    
Trademarks [Member]          
Goodwill and Intangible Assets [Line Items]          
Indefinite-lived intangible assets not subject to amortization, Net     $ 2,929.8 3,030.4  
U.S. Retail Pet Foods [Member]          
Goodwill and Intangible Assets [Line Items]          
Goodwill     2,442.3 2,442.3 1,824.5
Indefinite-lived intangible assets not subject to amortization, Net     1,400.0    
Goodwill impairment charges [1]       0.0  
U.S. Retail Pet Foods [Member] | Trademarks [Member]          
Goodwill and Intangible Assets [Line Items]          
Other intangible assets impairment charges   $ 52.4   107.2  
U.S. Retail Consumer Foods [Member]          
Goodwill and Intangible Assets [Line Items]          
Goodwill     1,358.2 1,358.2 1,600.4
Goodwill impairment charges [1]       97.9  
U.S. Retail Consumer Foods [Member] | Natural Foods [Member]          
Goodwill and Intangible Assets [Line Items]          
Goodwill impairment charges       97.9  
International and Away From Home [Member]          
Goodwill and Intangible Assets [Line Items]          
Goodwill     $ 413.1 419.5 $ 426.4
Goodwill impairment charges [1]       $ 0.0  
International and Away From Home [Member] | Away From Home [Member]          
Goodwill and Intangible Assets [Line Items]          
Percentage of segment goodwill     65.00%    
[1] We have recognized accumulated goodwill impairment charges of $242.9 as of April 30, 2020.