Earnings Per Share - Computation Of Basic And Diluted Earnings Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 27, 2014	Apr. 28, 2013
Earnings Per Share [Abstract]
Net income	$ 7,867	$ 14,777
Weighted average common shares outstanding - basic	67,300	66,956
Dilutive effect of employee equity incentive plans	670	1,623
Weighted average common shares outstanding - diluted	67,970	68,579
Basic earnings per common share	$ 0.12	$ 0.22
Diluted earnings per common share	$ 0.12	$ 0.22
Anti-dilutive shares not included in the above calculations	1,662	318

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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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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