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Acquisition of SpringCM Inc. - Narrative (Details) - SpringCM Inc. - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
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Sep. 04, 2018 | Apr. 30, 2019 | Jan. 31, 2019
Business Acquisition [Line Items] |  |  |
Cash paid, excluding cash acquired | $ 218.8 |  |
Portion of cash paid held in escrow | $ 8.2 |  |
Period of time held in escrow | 18 months |  |
Acquisition costs |  |  | $ 1.8
RSUs with vesting conditions |  |  |
Business Acquisition [Line Items] |  |  |
Shares granted to employees (in shares) |  | 0.5 |

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