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Summary of Restricted Stock Unit Activity (Detail) - USD ($)		12 Months Ended
		Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, weighted average grant date fair value		$ 52.76	$ 59.17	$ 76.19
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at January 29, 2017, shares		2,232,486
Granted, shares		1,301,405
Granted, with vesting subject to performance conditions, shares		222,110
Released, shares		(665,085)
Cancelled, shares		(732,779)
Balance at January 28, 2018, shares		2,358,137	2,232,486
Vested plus expected to vest at January 28, 2018 shares		1,684,675
Balance at January 29, 2017, weighted average grant date fair value		$ 63.75
Granted, weighted average grant date fair value		52.60
Granted, with vesting subject to performance conditions, weighted average grant date fair value		53.74
Released, weighted average grant date fair value		61.26
Cancelled, weighted average grant date fair value		61.09
Balance at January 28, 2018, weighted average grant date fair value		58.18	$ 63.75
Vested plus expected to vest at January 28, 2018, weighted average grant date fair value		$ 57.15
Weighted average contractual term remaining (years)		3 years 2 months 1 day
Vested plus expected to vest at January 29, 2017, weighted average contractual term remaining (years)		3 years 2 months 27 days
Balance at January 28, 2018	[1]	$ 125,948,000
Vested plus expected to vest at January 28, 2018	[1]	$ 89,978,000
[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 $53.41).

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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