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Earnings Per Share EPS - Reconciliation of Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Jan. 26, 2019	Jan. 27, 2018
Net (loss) income
Basic (loss) earnings per share	$ (3,319)	$ 8,606	$ 4,574	$ (6,189)	$ 7,132	$ 8,429	$ 9,861	$ 9,372
Dilution associated with stock compensation plans	0			0			0	0
Diluted (loss) earnings per share	$ (3,319)			$ (6,189)			$ 9,861	$ 9,372
Shares
Basic earnings per share (in shares)	45,018			44,518			44,834	44,403
Dilution associated with stock compensation plans (in shares)	0			0			305	395
Diluted earnings per share (in shares)	45,018			44,518			45,139	44,798
Per share (loss) income
Basic earnings per share (in dollars per share)	$ (0.07)			$ (0.14)			$ 0.22	$ 0.21
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)	$ (0.07)			$ (0.14)			$ 0.22	$ 0.21

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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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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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