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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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