Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
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%

Effective Income Tax Rate Reconciliation, Gains and Losses on Corporate Owned Life Insurance, Percent

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Percentage of tax effect of defined benefit pension plan termination.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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