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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Apr. 30, 2017 USD ($) plan | Apr. 30, 2016 USD ($) | Apr. 30, 2015 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 | 41,000,000 | $ 38,100,000 | $ 34,300,000
Cash equivalents | 50,100,000 | 34,000,000 |
Impairment of long-lived assets | $ 0 | 0 | 0
Number of defined benefit pension plans | plan | 2 |  |
Cash flows from operating activities | $ 77,080,000 | 74,604,000 | 60,164,000
Cash flows from financing activities | $ (20,821,000) | (8,909,000) | 10,283,000
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 | 10 years |  |
Promotional Display [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Amortization | $ 3,400,000 | 3,400,000 | $ 3,600,000
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 | 36 months |  |
Long-term Debt [Member] | ASU 2015-03 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Debt issuance costs |  | (300,000) |
Other Noncurrent Assets [Member] | ASU 2015-03 [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Debt issuance costs |  | $ (300,000) |

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