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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Apr. 30, 2017 vote | Feb. 01, 2017 USD ($)
Retained Earnings | Accounting Standards Update 2016-09 - Forfeiture Rate Component |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative impact adjustment | $ |  | $ (0.2)
Class A Common Stock |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Number of votes per share | 1 |
Class B Common Stock |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Number of votes per share | 10 |

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