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Accounting Policies - Other Various Policies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Cost of Sales |  |  |
Improvement in gross margin due to legal settlement (as a percent) |  |  | 0.20%
Pension Termination Charge. |  |  |
Pension termination charge | $ 32,671 |  |
Research and Development Costs |  |  |
Expenditures for research and development costs | 9,100 | $ 7,900 | $ 8,000
Advertising Expenses |  |  |
Gross advertising expenses | $ 106,400 | $ 88,300 | $ 82,100
Percentage reimbursement on shared advertising program | 30.00% |  |
Insurance/Self-Insurance |  |  |
Maximum deductibles for excess loss coverages | $ 1,500 |  |

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