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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Apr. 30, 2018 USD ($) plan | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount | $ 1,300,000 |  |
Advertising costs | 40,100,000 | $ 41,000,000 | $ 38,100,000
Cash equivalents |  | 50,100,000 |
Impairment of long-lived assets | 0 | 0 | 0
Net increase to beginning retained earnings | $ 269,576,000 | 224,031,000 |
Number of defined benefit pension plans | plan | 2 |  |
Cash flows from operating activities | $ 86,775,000 | 77,080,000 | 74,604,000
Cash flows from financing activities | (141,027,000) | (20,821,000) | (8,909,000)
Debt issuance costs | 14,304,000 |  |
Accounting Standards Update 2018-02 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Net increase to beginning retained earnings | 8,700,000 |  |
Net decrease to accumulated other comprehensive income (loss) | $ 8,700,000 |  |
ASU 2016-09, Statutory Tax Withholding Component [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash flows from operating activities |  | 2,800,000 | 1,400,000
Cash flows from financing activities |  | (2,800,000) | (1,400,000)
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 | $ 4,500,000 | 3,400,000 | $ 3,400,000
Promotional Display [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 30 months |  |
Promotional Display [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment useful lives | 60 months |  |
Other Noncurrent Assets [Member] | ASU 2015-03 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Debt issuance costs |  |  |

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