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Net Loss per Share - Additional Information (Details) shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2018 $ / shares shares | Oct. 31, 2018 vote $ / shares shares | Jul. 31, 2018 $ / shares
Class of Stock [Line Items] |  |  |
Shares issuable upon conversion (in shares) | shares | 4.4 | 4.4 |
Initial conversion price (in dollars per share) | $ / shares | $ 68.15 | $ 68.15 | $ 68.15
Average market price (in dollars per share) | $ / shares | $ 71.66 |  |
Class A Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of votes per share | vote |  | 1 |
Class B Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of votes per share | vote |  | 10 |

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