Reconciliation of Net Earnings and Number of Shares Used in Basic and Diluted Earnings Per Share Computations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 29, 2012	Jul. 31, 2011	Jul. 29, 2012	Jul. 31, 2011
Earnings Per Share [Line Items]
Net Earnings, Basic	$ 43,380	$ 39,309	$ 74,096	$ 70,924
Net Earnings, Diluted	$ 43,380	$ 39,309	$ 74,096	$ 70,924
Weighted Average Shares, Basic	99,209	104,467	99,815	104,795
Weighted Average Shares, Effect of dilutive stock-based awards	1,609	2,299	1,726	2,276
Weighted Average Shares, Diluted	100,818	106,766	101,541	107,071
Earnings Per Share, Basic	$ 0.44	$ 0.38	$ 0.74	$ 0.68
Earnings Per Share, Diluted	$ 0.43	$ 0.37	$ 0.73	$ 0.66

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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+ Details

- 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 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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- 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.

+ References

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-Glossary Weighted-Average Number of Common Shares Outstanding

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+ Details