Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	9 Months Ended
Nov. 01, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options, Outstanding at beginning of period	2,289,530
Stock Options, Granted	69,227
Stock Options, Exercised	(5,242)
Stock Options, Forfeited or expired	(45,811)
Stock Options, Outstanding at end of period	2,307,704
Stock Options, Vested or expected to vest at November 1, 2014	2,307,704
Stock Options, Exercisable at November 1, 2014	609,405
Weighted Average Exercise Price, Outstanding at beginning of period	$ 8.26
Weighted Average Exercise Price, Granted	$ 35.08
Weighted Average Exercise Price, Exercised	$ 6.64
Weighted Average Exercise Price, Forfeited or expired	$ 17.03
Weighted Average Exercise Price, Outstanding at end of period	$ 8.89
Weighted Average Exercise Price, Vested or expected at November 1, 2014	$ 8.89
Weighted Average Exercise Price, Exercisable at November 1, 2014	$ 5.96

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

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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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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.

+ References

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

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Weighted average price of options that were either forfeited or 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 weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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

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No definition available.

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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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No definition available.

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

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