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Shareholders' Equity and Share-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Stock Options
Outstanding at beginning of year, Shares	2,305
Granted, Shares	175
Canceled or forfeited, Shares	(119)
Exercised, Shares	(159)
Outstanding at end of year, Shares	2,202	2,305
Shares vested and expected to vest	2,179
Exercisable at end of year, Shares	1,684
Weighted Average Exercise Price Per Share
Outstanding at beginning of year, (usd per share)	$ 10.02
Granted, (usd per share)	7.83
Canceled or forfeited, (usd per share)	8.88
Exercised, (usd per share)	8.31
Outstanding at end of year, (usd per share)	10.03	$ 10.02
Shares vested and expected to vest (usd per share)	10.05
Exercisable at end of year (usd per share)	$ 10.32
Outstanding, beginning of period, weighted average remaining contractual life	4 years 4 months 28 days	4 years 6 months 2 days
Outstanding, end of period, weighted average remaining contractual life	4 years 4 months 28 days	4 years 6 months 2 days
Vested and expected to vest, weighted average remaining contractual life	4 years 4 months 12 days
Exercisable at end of period, weighted average remaining contractual life	3 years 3 months 18 days
Outstanding, beginning of period, aggregate intrinsic value	$ 356
Exercised, aggregate intrinsic value	98	$ 65	$ 64
Outstanding, end of period, aggregate intrinsic value	0	$ 356
Shares vested and expected to vest, aggregate intrinsic value	0
Exercisable at end of period, aggregate intrinsic value	$ 0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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