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Other Financial Instruments and Fair Value Measurements (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Other Financial Instruments and Fair Value Measurements (Textual) [Abstract] |  |  |  |
Company's Municipal bond mature in 2020 | $ 0.3 |  | $ 0.3 |
Company's Municipal bond mature in 2021 | 1.0 |  | 1.0 |
Company's Municipal bond mature in 2022 | 1.5 |  | 1.5 |
Company's Municipal bond mature in 2023 | 1.0 |  | 1.0 |
Company's Municipal bond mature in 2024 and beyond | 27.3 |  | 27.3 |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets impairment charges | 52.4 | $ 107.2 | $ 52.4 | $ 107.2
U.S. Retail Pet Foods [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Other intangible assets impairment charges | $ 52.4 | $ 107.2 |  |

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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