Earnings Per Share EPS - Reconciliation of Income (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Jul. 27, 2013	Jul. 28, 2012
Net income
Basic earnings per share	$ 5,720	$ 6,678
Dilution associated with stock compensation plans	0	0
Diluted earnings per share	$ 5,720	$ 6,678
Shares
Basic earnings per share (in shares)	42,528	42,068
Dilution associated with stock compensation plans (in shares)	238	73
Diluted earnings per share (in shares)	42,766	42,141
Per share income
Basic earnings per share (in dollars per share)	$ 0.13	$ 0.16
Dilution associated with stock compensation plans (in dollars per share)	$ 0.00	$ 0.00
Diluted earnings per share (in dollars per share)	$ 0.13	$ 0.16

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

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The amount resulting from the "as if" assumption that stock options or restrictive stock units were exercised for purposes of computing the dilutive effect of convertible securities.

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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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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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