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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Apr. 30, 2019 USD ($) plan | Apr. 30, 2018 USD ($) | Apr. 30, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Advertising costs | $ 38,900,000 | $ 40,100,000 | $ 41,000,000
Impairment of long-lived assets | 0 | 0 | 0
Impairment of goodwill | 0 | 0 | 0
Impairment of intangible assets | $ 0 | 0 | 0
Number of defined benefit pension plans | plan | 2 |  |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful life | 3 years |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Right-of-use asset | $ 95,000,000 |  |
Operating lease liability | $ 95,000,000 |  |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets, useful life | 6 years |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Right-of-use asset | $ 115,000,000 |  |
Operating lease liability | $ 115,000,000 |  |
Buildings And Improvements [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 15 years |  |
Buildings And Improvements [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 30 years |  |
Machinery And Equipment [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 3 years |  |
Machinery And Equipment [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 12 years |  |
Promotional Display [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization | $ 6,400,000 | $ 4,500,000 | $ 3,400,000
Promotional Display [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 24 months |  |
Promotional Display [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 60 months |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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