Share-Based Compensation - Valuation Assumptions (Details) - Stock Option [Member]
 12 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate (as a percent) [1] 1.62% 1.60% 1.86%
Price volatility (as a percent) [2] 43.23% 47.81% 53.73%
Expected Term (in years) [3] 6 years 6 months 8 days 6 years 3 months 6 years 3 months
Equity dividend yield [4] 0.00% 0.00% 0.00%
[1] Represents the yield on U.S. Treasury securities with a term consistent with the expected term of the stock options.
[2] Primarily based on the historical volatility of the Company's common stock over a period consistent with the expected term of the stock options.
[3] Beginning in 2016, the Company calculated the expected term assumption using the midpoint scenario, which combines historical exercise data with hypothetical exercise data for outstanding options. The Company believes this data currently represents the best estimate of the expected term of new employee options.
[4] The Company does not currently plan on paying regular dividends.