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Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock Options, Outstanding at beginning of period 2,289,530us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Stock Options, Granted 577,437us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod  
Stock Options, Exercised (22,018)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Stock Options, Forfeited or expired (118,780)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod  
Stock Options, Outstanding at end of period 2,726,169us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,289,530us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Stock Options, Vested or expected to vest at January 31, 2015 2,726,169us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber  
Stock Options, Vested and exercisable at January 31, 2015 653,861us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Weighted Average Exercise Price, Outstanding at beginning of period $ 8.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice  
Weighted Average Exercise Price, Granted $ 32.82us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice  
Weighted Average Exercise Price, Exercised $ 7.99us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice  
Weighted Average Exercise Price, Forfeited or expired $ 14.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice  
Weighted Average Exercise Price, Outstanding at end of period $ 13.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 8.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted Average Exercise Price, Vested or expected to vest at January 31, 2015 $ 13.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice  
Weighted Average Exercise Price, Vested and exercisable at January 31, 2015 $ 6.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Weighted Average Remaining Contractual Term (years), Outstanding 8 years 2 months 12 days 8 years 9 months 18 days
Weighted Average Remaining Contractual Term (years), Outstanding, Vested or expected to vest at January 31, 2015 8 years 2 months 12 days  
Weighted Average Remaining Contractual Term (years), Outstanding, Vested and exercisable at January 31, 2015 7 years 6 months  
Aggregate Intrinsic Value, Outstanding $ 33,367us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue  
Aggregate Intrinsic Value, Vested or expected to vest at January 31, 2015 33,367us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue  
Aggregate Intrinsic Value, Vested and exercisable at January 31, 2015 $ 11,181us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1