XML 22 R39.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Property and Equipment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Property, Plant and Equipment [Abstract] |  |  |  |
Depreciation and amortization expense | $ 3,900 | $ 2,500 | $ 7,508 | $ 4,662

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Depreciation, Depletion And Amortization, Excluding Amortization Of Deferred Contract Costs + References No definition available. + Details
Name: | zs_DepreciationDepletionAndAmortizationExcludingAmortizationOfDeferredContractCosts
Namespace Prefix: | zs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration