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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019 | Jul. 31, 2019
Concentration Risk [Line Items] |  |  |  |  |
Contract with customer, liability, revenue recognized |  |  | $ 148.4 | $ 68.2 |
Revenue, remaining performance obligation | $ 608.5 |  | 608.5 |  |
Accrued sales commissions | $ 5.7 |  | $ 5.7 |  | $ 9.0
Minimum |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Contract with customer, term of contract |  |  | 1 year |  |
Maximum |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Contract with customer, term of contract |  |  | 3 years |  |
Subscription and Support | Sales Revenue, Net | Product Concentration Risk | Transferred over Time |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue, percentage | 98.00% | 97.00% | 98.00% | 98.00% |

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