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Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	21.00%	30.40%
Increase (reduction) in income taxes resulting from:
Remeasurement of deferred taxes for changes in statutory U.S. tax rate	0.00%	(0.20%)	7.80%
State income taxes, net of federal benefit	4.20%	4.10%	3.30%
Tax effect of defined benefit pension plan termination	0.00%	2.70%	0.00%
U.S. manufacturing benefit	0.00%	0.00%	(1.50%)
Change in valuation allowance	0.70%	0.60%	(0.30%)
U.S. research tax credits	(0.60%)	(0.80%)	(1.90%)
Non-deductible asset impairment	4.90%	0.00%	0.00%
Fair value adjustment of contingent liability	(1.40%)	0.00%	0.00%
Tax on undistributed foreign earnings	1.10%	0.00%	0.00%
Miscellaneous items	1.50%	(1.00%)	(1.10%)
Effective tax rate	31.40%	26.40%	36.70%

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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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