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Stock-Based Compensation - Restricted Stock and RSUs (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 28, 2018
Maximum
Stock-Based Compensation
Vesting period	4 years
Restricted Stock
Shares
Granted (in shares)	167,649
Restricted Stock | Employees
Stock-Based Compensation
Percentage vesting each year from date of grant	25.00%
Period from grant date for first vesting	1 year
Vesting period	4 years
Unrecognized compensation cost	$ 6.5
Period for recognition of unrecognized compensation costs	1 year 9 months 18 days
Shares
Non-vested at beginning of period (in shares)	247,000
Granted (in shares)	168,000
Vested (in shares)	(90,000)
Canceled (in shares)	(32,000)
Non-vested at end of period (in shares)	293,000	247,000
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share)	$ 29.55
Granted (in dollars per share)	30.43
Vested (in dollars per share)	28.50
Canceled (in dollars per share)	29.83
Non-vested at end of period (in dollars per share)	30.34	$ 29.55
Restricted Stock | Non-Employee Directors
Weighted Average Grant Date Fair Value
Granted (in dollars per share)	$ 31.77	$ 33.15	$ 23.85
Restricted Stock | Non-Employee Directors | Maximum
Shares
Granted (in shares)	100,000	100,000	100,000

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- Definition

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Period from date of grant for first vesting of the award.

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Weighted-average period over which cost not yet recognized is expected to be recognized for 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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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