Stock Options Outstanding and Exercisable (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Oct. 27, 2012	Jan. 28, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 9.85
Range of Exercise Prices, Upper Limit	$ 34.12
Options Outstanding, Number of Shares	6,292	7,227
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 3 months 15 days
Options Outstanding, Weighted-Average Exercise Price	$ 19.96	$ 18.44
Options Exercisable, Number of Shares	3,977
Options Exercisable, Weighted-Average Exercise Price	$ 18.11
$9.85 to $15.10
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 9.85
Range of Exercise Prices, Upper Limit	$ 15.10
Options Outstanding, Number of Shares	2,283
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 4 months 2 days
Options Outstanding, Weighted-Average Exercise Price	$ 12.52
Options Exercisable, Number of Shares	1,888
Options Exercisable, Weighted-Average Exercise Price	$ 11.98
$15.74 to $23.92
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 15.74
Range of Exercise Prices, Upper Limit	$ 23.92
Options Outstanding, Number of Shares	2,202
Options Outstanding, Weighted-Average Remaining Contractual Life	6 years 6 months 29 days
Options Outstanding, Weighted-Average Exercise Price	$ 20.45
Options Exercisable, Number of Shares	1,250
Options Exercisable, Weighted-Average Exercise Price	$ 21.65
$24.04 to $34.12
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 24.04
Range of Exercise Prices, Upper Limit	$ 34.12
Options Outstanding, Number of Shares	1,807
Options Outstanding, Weighted-Average Remaining Contractual Life	5 years 10 months 17 days
Options Outstanding, Weighted-Average Exercise Price	$ 28.76
Options Exercisable, Number of Shares	839
Options Exercisable, Weighted-Average Exercise Price	$ 26.62

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Name Accounting Standards Codification

-Topic 718

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-Section 50

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Number 123R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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