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Summary of Restricted Stock Unit Activity (Detail) - USD ($)		12 Months Ended
		Jan. 29, 2017	Jan. 31, 2016	Feb. 01, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, weighted average grant date fair value		$ 59.17	$ 76.19	$ 63.18
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at January 31, 2016, shares		2,288,958
Granted, shares		1,159,211
Released, shares		(976,110)
Cancelled, shares		(239,573)
Balance at January 29, 2017, shares		2,232,486	2,288,958
Vested plus expected to vest at January 29, 2017		1,520,660
Balance at January 31, 2016, weighted average grant date fair value		$ 60.89
Granted, weighted average grant date fair value		59.17
Released, weighted average grant date fair value		52.33
Cancelled, weighted average grant date fair value		60.70
Balance at January 29, 2017, weighted average grant date fair value		63.75	$ 60.89
Vested plus expected to vest at January 29, 2017, weighted average grant date fair value		$ 63.96
Weighted average contractual term remaining (years)		3 years 1 month 10 days
Vested plus expected to vest at January 31, 2016, weighted average contractual term remaining (years)		3 years 1 month 21 days
Balance at January 29, 2017	[1]	$ 106,043,000
Vested plus expected to vest at January 29, 2017	[1]	$ 72,231,000
[1] Intrinsic value for outstanding and unvested restricted stock units is based on the market value of our common stock on the last business day of the fiscal year (or $47.50).

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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As of the balance sheet date, the weighted average grant date fair value of outstanding equity instruments, other than stock options, that are vested and expected to vest.

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As of the balance sheet date, the number of shares of outstanding non-option equity instruments, vested and expected to vest.

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