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Income Taxes - Reconciliation of Effective Tax Rate (Details) | 12 Months Ended
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Apr. 24, 2021 | Apr. 25, 2020 | Apr. 27, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory tax rate | 21.00% | 21.00% | 21.00%
Increase (reduction) in income taxes resulting from: |  |  |
State income taxes, net of federal benefit | 4.30% | 4.20% | 4.10%
Tax effect of defined benefit pension plan termination | 0.00% | 0.00% | 2.70%
Gains and losses on corporate owned life insurance | (1.20%) | 0.50% | (0.20%)
Change in valuation allowance | 0.70% | 0.70% | 0.60%
U.S. research tax credits | (0.50%) | (0.60%) | (0.80%)
Non-deductible asset impairment | 0.00% | 4.90% | 0.00%
Fair value adjustment of contingent consideration liability | 2.00% | (1.40%) | 0.00%
Tax on undistributed foreign earnings | 0.00% | 1.10% | 0.00%
Miscellaneous items | 0.00% | 1.00% | (1.00%)
Effective tax rate | 26.30% | 31.40% | 26.40%

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