Earnings Per Share EPS - Reconciliation of Income (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Oct. 26, 2013	Oct. 27, 2012	Oct. 26, 2013	Oct. 27, 2012
Net income
Basic earnings per share	$ 11,790	$ 11,547	$ 17,509	$ 18,225
Dilution associated with stock compensation plans	0	0	0	0
Diluted earnings per share	$ 11,790	$ 11,547	$ 17,509	$ 18,225
Shares
Basic earnings per share (in shares)	42,709	42,163	42,639	42,138
Dilution associated with stock compensation plans (in shares)	293	153	384	149
Diluted earnings per share (in shares)	43,002	42,316	43,023	42,287
Per share income
Basic earnings per share (in dollars per share)	$ 0.28	$ 0.27	$ 0.41	$ 0.43
Dilution associated with stock compensation plans (in dollars per share)	$ (0.01)	$ 0.00	$ 0.00	$ 0.00
Diluted earnings per share (in dollars per share)	$ 0.27	$ 0.27	$ 0.41	$ 0.43

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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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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