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Note 1 - Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Apr. 28, 2018 USD ($) shares | Apr. 29, 2017 USD ($) shares | Apr. 30, 2016 USD ($) shares
Incremental Common Shares Attributable to Dilutive Effect of Equity Unit Purchase Agreements | shares | 323,000 | 206,000 | 219,000
Self Insurance Reserve, Noncurrent, Covered by Insurance | $ 5,000 | $ 5,400 |
Inventory, Finished Goods, Gross, Total | 37,600 | 35,000 |
Inventory, Raw Materials, Gross, Total | 23,300 | 18,400 |
Marketing Expense | 49,700 | 44,900 | $ 38,800
Income Tax Expense (Benefit), Total | $ 55,715 | 55,780 | 31,507
Number of Operating Segments | 1 |  |
Shipping and Handling Costs | $ 63,300 | 50,000 | $ 44,600
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 30 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |
April 29, 2017 [Member] | Reclassification from Current Deferred Taxes to Noncurrent Deferred Taxes [Member] |  |  |
Prior Period Reclassification Adjustment | $ 3,900 |  |
Reclassification of Excess Tax Benefits from Financing to Operating Activities [Member] | April 29, 2017 [Member] |  |  |
Prior Period Reclassification Adjustment | 495 |  |
Reclassification of Excess Tax Benefits from Financing to Operating Activities [Member] | April 30, 2016 [Member] |  |  |
Prior Period Reclassification Adjustment | (1,500) |  |
Accounting Standards Update 2016-09 [Member] |  |  |
Income Tax Expense (Benefit), Total | (886) |  |
Other Noncurrent Liabilities [Member] |  |  |
Self Insurance Reserve and Coverage by Insurance, Noncurrent | $ 6,500 | $ 6,900 |

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