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	9 Months Ended
Oct. 27, 2013	Oct. 28, 2012	Oct. 27, 2013	Oct. 28, 2012
Earnings Per Share [Abstract]
Net income	$ 12,453	$ 16,590	$ 46,342	$ 28,821
Weighted average common shares outstanding - basic	67,792	65,996	67,454	65,622
Dilutive effect of employee equity incentive plans	1,079	1,469	1,365	1,684
Weighted average common shares outstanding - diluted	68,871	67,465	68,819	67,306
Basic earnings per common share	$ 0.18	$ 0.25	$ 0.69	$ 0.44
Diluted earnings per common share	$ 0.18	$ 0.25	$ 0.67	$ 0.43
Anti-dilutive shares not included in the above calculations	598	1,053	456	1,163

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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+ Details

- Definition

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

+ References

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- Definition

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.

+ References+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

- Definition

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.

+ References+ Details

- Definition

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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+ Details