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Other Financial Instruments and Fair Value Measurements (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Other Financial Instruments and Fair Value Measurements (Textual) [Abstract]        
Company's Municipal bond mature in 2022 $ 1.2   $ 1.2  
Company's Municipal bond mature in 2023 0.0   0.0  
Company's Municipal bond mature in 2024 2.0   2.0  
Company's Municipal bond mature in 2025 2.9   2.9  
Company's Municipal bond mature in 2026 1.6   1.6  
Company's Municipal bond mature in 2027 and beyond 15.1   15.1  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other intangible assets impairment charge 150.4 $ 0.0 150.4 $ 0.0
U.S. Retail Pet Foods [Member] | Trademarks        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Other intangible assets impairment charge $ 150.4   $ 150.4