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Description of Business and Significant Accounting Policies - Cost of Internal Use Software (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Depreciation of capitalized software | $ 7.1 | $ 6.1 | $ 5.3
Net book value of capitalized software assets | 20.3 | 24.9 |
Capitalized computer software currently under development | $ 4.7 | $ 3.1 |
Capitalized Software Costs | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated life of software | 3 years |  |
Capitalized Software Costs | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated life of software | 10 years |  |

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