Share-Based Compensation - Valuation Assumptions (Details) - Stock Option [Member]
 3 Months Ended
Apr. 30, 2016
May. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate [1] 1.60% 1.59%
Price volatility [2] 43.15% 47.93%
Expected term [3] 6 years 6 months 15 days 6 years 3 months
Dividend yield [4] 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] For the first two years following the initial public offering of the Company's common stock, this was based on the historical volatility of selected comparable companies over a period consistent with the expected term of the stock options because the Company had a limited history of being publicly traded. Comparable companies were selected primarily based on industry, stage of life cycle, and size. Beginning in May 2012, the Company began using its own volatility as an additional input in the determination of expected volatility.
[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, as 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.