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Commitments and Contingencies - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 4 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2020 USD ($) | Apr. 30, 2019 USD ($) | Jan. 31, 2020 USD ($) | Apr. 18, 2017 claim | Jul. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | Jul. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Purchase obligation |  |  | $ 7.0 |  | $ 2.5 |  |
Symantec Cases |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Complaints filed | claim |  |  |  | 2 |  |  |
Broadcom |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Payment for settlement | $ 15.0 |  |  |  |  |  |
Litigation expense |  |  | $ 15.0 |  |  |  |
Finjan Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Payment for settlement |  | $ 7.3 |  |  |  |  |
Accrued liability for potential lawsuit loss |  | $ 4.1 |  |  |  | $ 0.7 | $ 2.5

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