Options Granted under Stock Option Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Number of Shares
Options outstanding at beginning of year	5,668	5,907	7,227
Granted	849	1,154	940
Exercised	(810)	(1,328)	(2,213)
Expired or cancelled	(138)	(65)	(47)
Options outstanding at end of year	5,569	5,668	5,907
Options exercisable at end of year	3,759	3,495	3,593
Options vested and expected to vest	5,546	5,558	5,804
Options available for future grant at end of year	13,911	3,267	5,518
Weighted-Average Exercise Price
Options outstanding at beginning of year	$ 22.66	$ 19.93	$ 18.44
Granted	$ 46.20	$ 34.25	$ 30.96
Exercised	$ 21.74	$ 20.26	$ 19.67
Expired or cancelled	$ 42.55	$ 29.55	$ 23.74
Options outstanding at end of year	$ 25.89	$ 22.66	$ 19.93
Options exercisable at end of year	$ 19.74	$ 18.02	$ 17.83
Options vested and expected to vest	$ 25.82	$ 22.45	$ 19.82

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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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.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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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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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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