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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 |

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