Stock-Based Compensation - Stock Options (Details) - Stock Options - $ / shares	3 Months Ended	9 Months Ended
Jul. 27, 2019	Jan. 25, 2020
Stock-Based Compensation
Shares granted (in shares)	248,662
Fair value assumptions
Risk-free interest rate		2.19%
Dividend rate		1.72%
Expected life in years		5 years
Stock price volatility		34.27%
Fair value per share (in dollars per share)		$ 7.94
Minimum
Stock-Based Compensation
Vesting period		1 year
Period of recognition of expenses for retirement-eligible employees from the grant date		10 months
Maximum
Stock-Based Compensation
Vesting period		4 years

Period for which the acceleration of expenses for options granted to retirement-eligible employees from the grant date.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

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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- Definition

Gross number of share options (or share units) granted during the period.

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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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