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Earnings Per Share EPS - Reconciliation of Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Oct. 27, 2018	Jul. 28, 2018	Oct. 28, 2017	Jul. 29, 2017	Oct. 27, 2018	Oct. 28, 2017
Net income
Basic earnings per share	$ 8,606	$ 4,574	$ 7,132	$ 8,429	$ 13,180	$ 15,561
Dilution associated with stock compensation plans	0		0		0	0
Diluted earnings per share	$ 8,606		$ 7,132		$ 13,180	$ 15,561
Shares
Basic earnings per share (in shares)	44,780		44,412		44,717	44,345
Dilution associated with stock compensation plans (in shares)	170		267		277	351
Diluted earnings per share (in shares)	44,950		44,679		44,994	44,696
Per share income
Basic earnings per share (in dollars per share)	$ 0.19		$ 0.16		$ 0.29	$ 0.35
Dilution associated with stock compensation plans (in dollars per share)	0.00		0.00		0.00	0.00
Diluted earnings per share (in dollars per share)	$ 0.19		$ 0.16		$ 0.29	$ 0.35

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Incremental Common Shares Attributable to Share-based Payment Arrangements, Per Share Amount

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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