Stock-based Compensation - Summary of Weighted-Average Assumptions (Details) - $ / shares	12 Months Ended
Apr. 24, 2021	Apr. 25, 2020	Apr. 27, 2019
Director And Employee Stock Option Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	4.40%	4.70%	4.50%
Expected stock price volatility	34.60%	26.80%	24.60%
Risk-free interest rate	0.40%	1.80%	2.90%
Expected life (years)	6 years	6 years	6 years 2 months 12 days
Weighted average grant date fair value per share (in usd per share)	$ 4.60	$ 3.37	$ 3.66
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	3.60%	5.10%	5.20%
Expected stock price volatility	51.70%	34.30%	38.60%
Risk-free interest rate	0.10%	1.60%	2.50%
Expected life (years)	7 months 6 days	7 months 6 days	7 months 6 days
Weighted average grant date fair value per share (in usd per share)	$ 8.77	$ 4.98	$ 5.21

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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