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Shareholders' Equity - Summary of Combined Stock Option Activity and Related Information for Stock Options Granted (Details) - Stock Options - 2010 Plan and 2007 Plan - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding - beginning balance (in shares)	106,668	114,168	129,169
Exercised (in shares)	0	0	(13,333)
Cancelled (in shares)	0	(7,500)	(1,668)
Outstanding - ending balance (in shares)	106,668	106,668	114,168
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share)	$ 35.76	$ 35.85	$ 34.71
Wtd. Avg. Exercise Price, Exercised (in dollars per share)	0	0	24.67
Wtd. Avg. Exercise Price, Cancelled (in dollars per share)	0	37.01	37.01
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share)	$ 35.76	$ 35.76	$ 35.85
Weighted-average life of outstanding options	4 years	5 years	6 years 1 month 6 days
Intrinsic value of outstanding options	$ 0.1	$ 0.1	$ 0.6

X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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