$ZS
Zscaler, Inc. Stock $zs

$zs Overview Financials Valuation SEC Filings Company Website

2019 Q3 Form 10-K Financial Statement

#000171368319000030 Filed on September 18, 2019

Income Statement

Concept	2019 Q3	2019	2018 Q3
Revenue	$86.10M	$302.8M	$56.20M
YoY Change	53.2%	59.24%	53.97%
Cost Of Revenue	$17.30M	$59.67M	$11.50M
YoY Change	50.43%	57.54%	43.75%
Gross Profit	$68.80M	$243.2M	$44.70M
YoY Change	53.91%	59.66%	56.84%
Gross Profit Margin	79.91%	80.3%	79.54%
Selling, General & Admin	$56.50M	$216.5M	$41.10M
YoY Change	37.47%	46.74%	24.55%
% of Gross Profit	82.12%	89.04%	91.95%
Research & Development	$16.90M	$61.97M	$11.50M
YoY Change	46.96%	57.37%	33.72%
% of Gross Profit	24.56%	25.48%	25.73%
Depreciation & Amortization	$3.570M	$11.31M	$2.150M
YoY Change	66.05%	41.55%	17.49%
% of Gross Profit	5.19%	4.65%	4.81%
Operating Expenses	$73.70M	$278.5M	$52.60M
YoY Change	40.11%	48.98%	26.44%
Operating Profit	-$4.900M	-$35.31M	-$7.900M
YoY Change	-37.97%	1.99%	-39.69%
Interest Expense	$2.100M	$0.00	$2.100M
YoY Change	0.0%		-1150.0%
% of Operating Profit
Other Income/Expense, Net	-$200.0K	-$329.0K	-$800.0K
YoY Change	-75.0%	-516.46%	-366.67%
Pretax Income	-$6.000M	-$27.91M	-$6.600M
YoY Change	-9.09%	-13.61%	-48.84%
Income Tax	-$800.0K	$743.0K	$300.0K
% Of Pretax Income
Net Earnings	-$5.300M	-$28.66M	-$7.000M
YoY Change	-24.29%	-14.83%	-47.37%
Net Earnings / Revenue	-6.16%	-9.46%	-12.46%
Basic Earnings Per Share		-$0.23
Diluted Earnings Per Share	-$41.96K	-$0.23	-$58.72K
COMMON SHARES
Basic Shares Outstanding	127.5M shares	123.6M shares	119.8M shares
Diluted Shares Outstanding		123.6M shares

Balance Sheet

Concept	2019 Q3	2019	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$364.6M	$364.6M	$298.5M
YoY Change	22.14%	22.14%	239.33%
Cash & Equivalents	$78.48M	$78.50M	$135.6M
Short-Term Investments	$286.2M	$286.2M	$163.0M
Other Short-Term Assets	$38.10M	$38.10M	$27.00M
YoY Change	41.11%	41.11%	69.81%
Inventory
Prepaid Expenses
Receivables	$93.34M	$93.30M	$61.61M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$496.1M	$496.1M	$387.2M
YoY Change	28.13%	28.13%	170.92%
LONG-TERM ASSETS
Property, Plant & Equipment	$41.05M	$41.00M	$19.77M
YoY Change	107.67%	107.07%	50.43%
Goodwill	$7.479M		$0.00
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$2.277M	$50.80M	$1.078M
YoY Change	111.22%	24.21%	-59.49%
Total Long-Term Assets	$108.1M	$108.1M	$60.62M
YoY Change	78.29%	78.38%	51.57%
TOTAL ASSETS
Total Short-Term Assets	$496.1M	$496.1M	$387.2M
Total Long-Term Assets	$108.1M	$108.1M	$60.62M
Total Assets	$604.2M	$604.2M	$447.8M
YoY Change	34.92%	34.93%	144.82%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$6.208M	$6.200M	$4.895M
YoY Change	26.82%	26.53%	30.08%
Accrued Expenses	$34.40M	$34.40M	$35.70M
YoY Change	-3.64%	-3.64%	53.22%
Deferred Revenue	$221.4M		$140.7M
YoY Change	57.38%		64.59%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$261.9M	$261.9M	$182.8M
YoY Change	43.27%	43.27%	51.78%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$3.840M	$33.70M	$1.360M
YoY Change	182.35%	36.44%	-6.66%
Total Long-Term Liabilities	$3.840M	$33.70M	$1.360M
YoY Change	182.35%	36.44%	-6.66%
TOTAL LIABILITIES
Total Short-Term Liabilities	$261.9M	$261.9M	$182.8M
Total Long-Term Liabilities	$3.840M	$33.70M	$1.360M
Total Liabilities	$295.6M	$295.6M	$207.5M
YoY Change	42.43%	42.46%	55.97%
SHAREHOLDERS EQUITY
Retained Earnings	-$224.5M		-$196.1M
YoY Change	14.46%		21.04%
Common Stock	$127.0K		$119.0K
YoY Change	6.72%		561.11%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$308.6M	$308.6M	$240.2M
YoY Change
Total Liabilities & Shareholders Equity	$604.2M	$604.2M	$447.8M
YoY Change	34.92%	34.93%	144.82%

Cashflow Statement

Concept	2019 Q3	2019	2018 Q3
OPERATING ACTIVITIES
Net Income	-$5.300M	-$28.66M	-$7.000M
YoY Change	-24.29%	-14.83%	-47.37%
Depreciation, Depletion And Amortization	$3.570M	$11.31M	$2.150M
YoY Change	66.05%	41.55%	17.49%
Cash From Operating Activities	$17.83M	$58.03M	$14.66M
YoY Change	21.62%	235.28%	-495.15%
INVESTING ACTIVITIES
Capital Expenditures	-$10.27M	$25.52M	-$2.740M
YoY Change	274.82%	90.49%	58.38%
Acquisitions		$11.43M
YoY Change
Other Investing Activities	$1.880M	-$131.9M	-$162.9M
YoY Change	-101.15%	30364.2%
Cash From Investing Activities	-$8.390M	-$162.1M	-$165.7M
YoY Change	-94.94%	-9.0%	9476.3%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$22.00K
YoY Change		-99.42%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	14.08M	$46.38M	-850.0K
YoY Change	-1756.47%	-77.74%	-113.64%
NET CHANGE
Cash From Operating Activities	17.83M	$58.03M	14.66M
Cash From Investing Activities	-8.390M	-$162.1M	-165.7M
Cash From Financing Activities	14.08M	$46.38M	-850.0K
Net Change In Cash	23.52M	-$57.66M	-151.9M
YoY Change	-115.49%	-221.14%	-19322.78%
FREE CASH FLOW
Cash From Operating Activities	$17.83M	$58.03M	$14.66M
Capital Expenditures	-$10.27M	$25.52M	-$2.740M
Free Cash Flow	$28.10M	$32.51M	$17.40M
YoY Change	61.49%	731.38%	-978.79%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--07-31
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CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-38413
CY2019	dei	Entity Registrant Name EntityRegistrantName	ZSCALER, INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	26-1173892
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	110 Rose Orchard Way
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	San Jose
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
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CY2019	dei	Security12b Title Security12bTitle	Common Stock, $0.001 Par Value
CY2019	dei	Trading Symbol TradingSymbol	ZS
CY2019	dei	Security Exchange Name SecurityExchangeName	NASDAQ
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CY2016Q3	us-gaap	Stockholders Equity StockholdersEquity	-124740000	USD
CY2017	us-gaap	Temporary Equity Accretion To Redemption Value TemporaryEquityAccretionToRedemptionValue	9570000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Increase In Carrying Amount Of Redeemable Preferred Stock AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	9570000	USD
CY2017	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2971000	USD
CY2017	zs	Stock Issued During Period Value Early Exercised Stock Options StockIssuedDuringPeriodValueEarlyExercisedStockOptions	0	USD
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	-263000	USD
CY2017	zs	Repayment Of Notes Receivable Stockholders RepaymentOfNotesReceivableStockholders	1856000	USD
CY2017	zs	Increase Decrease To Notes Receivable Related To Early Exercised Stock Options IncreaseDecreaseToNotesReceivableRelatedToEarlyExercisedStockOptions	-83000	USD
CY2017	zs	Adjustments To Additional Paid In Capital Early Exercise Of Stock Options AdjustmentsToAdditionalPaidInCapitalEarlyExerciseOfStockOptions	3702000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	9919000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-35460000	USD
CY2017Q3	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	72501000	shares
CY2017Q3	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	200977000	USD
CY2017Q3	us-gaap	Stockholders Equity StockholdersEquity	-151142000	USD
CY2017Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0	USD
CY2018	us-gaap	Temporary Equity Accretion To Redemption Value TemporaryEquityAccretionToRedemptionValue	6332000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Increase In Carrying Amount Of Redeemable Preferred Stock AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock	6332000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4985000	USD
CY2018	zs	Stock Issued During Period Value Early Exercised Stock Options StockIssuedDuringPeriodValueEarlyExercisedStockOptions	0	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	-214000	USD
CY2018	zs	Repayment Of Notes Receivable Stockholders RepaymentOfNotesReceivableStockholders	5346000	USD
CY2018	zs	Increase Decrease To Notes Receivable Related To Early Exercised Stock Options IncreaseDecreaseToNotesReceivableRelatedToEarlyExercisedStockOptions	267000	USD
CY2018	zs	Adjustments To Additional Paid In Capital Early Exercise Of Stock Options AdjustmentsToAdditionalPaidInCapitalEarlyExerciseOfStockOptions	3255000	USD
CY2018	zs	Payments For Underwriting Discount PaymentsForUnderwritingDiscount	15456000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	6164000	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	198880000	USD
CY2018	zs	Temporary Equity Shares Elimination As Part Of Reorganization TemporaryEquitySharesEliminationAsPartOfReorganization	72501000	shares
CY2018	zs	Temporary Equity Value Elimination As Part Of Reorganization TemporaryEquityValueEliminationAsPartOfReorganization	207309000	USD
CY2018	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	207309000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11224000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-124000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-33646000	USD
CY2018Q3	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	0	shares
CY2018Q3	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	0	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	240236000	USD
CY2018Q3	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	29862000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	16436000	USD
CY2019	zs	Stock Vested During Period Value StockVestedDuringPeriodValue	0	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	0	USD
CY2019	zs	Repayment Of Notes Receivable Stockholders RepaymentOfNotesReceivableStockholders	1905000	USD
CY2019	zs	Increase Decrease To Notes Receivable Related To Early Exercised Stock Options IncreaseDecreaseToNotesReceivableRelatedToEarlyExercisedStockOptions	146000	USD
CY2019	zs	Adjustments To Additional Paid In Capital Initial Public Offering Costs Adjustment AdjustmentsToAdditionalPaidInCapitalInitialPublicOfferingCostsAdjustment	300000	USD
CY2019	zs	Adjustments To Additional Paid In Capital Early Exercise Of Stock Options AdjustmentsToAdditionalPaidInCapitalEarlyExerciseOfStockOptions	983000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	46953000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	392000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-28655000	USD
CY2019Q3	us-gaap	Temporary Equity Shares Outstanding TemporaryEquitySharesOutstanding	0	shares
CY2019Q3	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	0	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	308558000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-28655000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-33646000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-35460000	USD
CY2019	zs	Depreciation Depletion And Amortization Excluding Amortization Of Deferred Contract Costs DepreciationDepletionAndAmortizationExcludingAmortizationOfDeferredContractCosts	10398000	USD
CY2018	zs	Depreciation Depletion And Amortization Excluding Amortization Of Deferred Contract Costs DepreciationDepletionAndAmortizationExcludingAmortizationOfDeferredContractCosts	7988000	USD
CY2017	zs	Depreciation Depletion And Amortization Excluding Amortization Of Deferred Contract Costs DepreciationDepletionAndAmortizationExcludingAmortizationOfDeferredContractCosts	6840000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	908000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	0	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	0	USD
CY2019	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	18651000	USD
CY2018	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	13181000	USD
CY2017	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	8474000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	46423000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	11224000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	9919000	USD
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	1392000	USD
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	0	USD
CY2017	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	0	USD
CY2019	zs	Accretion Of Purchase Discounts Net AccretionOfPurchaseDiscountsNet	2181000	USD
CY2018	zs	Accretion Of Purchase Discounts Net AccretionOfPurchaseDiscountsNet	0	USD
CY2017	zs	Accretion Of Purchase Discounts Net AccretionOfPurchaseDiscountsNet	0	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-284000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-130000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	89000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	31730000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	22559000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	14563000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	32526000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	34429000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Asset IncreaseDecreaseInContractWithCustomerAsset	21999000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	7642000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	5068000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	2718000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	495000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-779000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	2249000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-336000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	2076000	USD
CY2017	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	5376000	USD
CY2019	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-1849000	USD
CY2018	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	11785000	USD
CY2017	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	5246000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	87179000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	67404000	USD
CY2017	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	30706000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	58027000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	17307000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-6019000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25520000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	13397000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7783000	USD
CY2019	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	3162000	USD
CY2018	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	1773000	USD
CY2017	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	391000	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1480000	USD
CY2018	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	USD
CY2017	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	11432000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	335186000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	163366000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	0	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	199716000	USD
CY2017	zs	Proceeds From Issuance Of Early Exercised Stock Options ProceedsFromIssuanceOfEarlyExercisedStockOptions	4701000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	0	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	433000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	14990000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-162074000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-178103000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-8174000	USD
CY2019	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	0	USD
CY2018	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	205344000	USD
CY2017	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	0	USD
CY2019	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	1797000	USD
CY2018	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	4336000	USD
CY2017	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	31000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	29862000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	4985000	USD
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2971000	USD
CY2019	zs	Proceeds From Issuance Of Early Exercised Stock Options ProceedsFromIssuanceOfEarlyExercisedStockOptions	0	USD
CY2018	zs	Proceeds From Issuance Of Early Exercised Stock Options ProceedsFromIssuanceOfEarlyExercisedStockOptions	869000	USD
CY2019	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	16436000	USD
CY2018	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	22000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3811000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	zs	Proceeds From Repayment Of Notes Receivable Stockholders ProceedsFromRepaymentOfNotesReceivableStockholders	1905000	USD
CY2018	zs	Proceeds From Repayment Of Notes Receivable Stockholders ProceedsFromRepaymentOfNotesReceivableStockholders	5346000	USD
CY2017	zs	Proceeds From Repayment Of Notes Receivable Stockholders ProceedsFromRepaymentOfNotesReceivableStockholders	1856000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46384000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	208397000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	9497000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-57663000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	47601000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4696000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	136147000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	88546000	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	983000	USD
CY2016Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	93242000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	78484000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	136147000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	88546000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1770000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	870000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	385000	USD
CY2019	zs	Net Change In Capital Expenditures Included In Liabilities NetChangeInCapitalExpendituresIncludedInLiabilities	2911000	USD
CY2018	zs	Net Change In Capital Expenditures Included In Liabilities NetChangeInCapitalExpendituresIncludedInLiabilities	-537000	USD
CY2017	zs	Net Change In Capital Expenditures Included In Liabilities NetChangeInCapitalExpendituresIncludedInLiabilities	746000	USD
CY2019	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	0	USD
CY2018	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	6332000	USD
CY2017	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	9570000	USD
CY2019	zs	Repurchase Of Common Stock Noncash RepurchaseOfCommonStockNoncash	0	USD
CY2018	zs	Repurchase Of Common Stock Noncash RepurchaseOfCommonStockNoncash	214000	USD
CY2017	zs	Repurchase Of Common Stock Noncash RepurchaseOfCommonStockNoncash	263000	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	3255000	USD
CY2017	us-gaap	Stock Issued1 StockIssued1	3702000	USD
CY2019	zs	Deferred Offering Costs Accrued But Not Paid DeferredOfferingCostsAccruedButNotPaid	-2097000	USD
CY2018	zs	Deferred Offering Costs Accrued But Not Paid DeferredOfferingCostsAccruedButNotPaid	940000	USD
CY2017	zs	Deferred Offering Costs Accrued But Not Paid DeferredOfferingCostsAccruedButNotPaid	1157000	USD
CY2019	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	0	USD
CY2018	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	207309000	USD
CY2017	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	0	USD
CY2019Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	78484000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	135579000	USD
CY2017Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	87978000	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	0	USD
CY2018Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	236000	USD
CY2017Q3	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	0	USD
CY2019Q3	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	0	USD
CY2018Q3	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	332000	USD
CY2017Q3	us-gaap	Restricted Cash And Cash Equivalents Noncurrent RestrictedCashAndCashEquivalentsNoncurrent	568000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	78484000	USD
CY2018Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	136147000	USD
CY2017Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	88546000	USD
CY2018Q1	us-gaap	Sale Of Stock Number Of Shares Issued In Transaction SaleOfStockNumberOfSharesIssuedInTransaction	13800000	shares
CY2018Q1	us-gaap	Sale Of Stock Price Per Share SaleOfStockPricePerShare	16.00
CY2018Q1	us-gaap	Sale Of Stock Consideration Received On Transaction SaleOfStockConsiderationReceivedOnTransaction	205300000	USD
CY2018Q1	zs	Payments For Underwriting Discount PaymentsForUnderwritingDiscount	15500000	USD
CY2018Q1	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	6200000	USD
CY2018Q1	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	72500750	shares
CY2018Q1	zs	Conversion Of Stock Conversion Ratio ConversionOfStockConversionRatio	1
CY2019	us-gaap	Fiscal Period FiscalPeriod	<div style="text-indent:18pt;text-align:justify;margin-top:6pt;margin-bottom:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-style:italic;font-weight:700;line-height:144%;">Fiscal Year </span></div><div style="text-indent:18pt;text-align:justify;margin-top:12pt;margin-bottom:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-weight:400;line-height:144%;">Our fiscal year ends on July 31. References to fiscal 2019, for example, refer to our fiscal year ended July 31, 2019.</span></div>
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="text-indent:18pt;text-align:justify;margin-top:18pt;margin-bottom:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-style:italic;font-weight:700;line-height:144%;">Use of Estimates </span></div><div style="text-indent:18pt;text-align:justify;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-weight:400;line-height:144%;">The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgments and assumptions that affect the amounts reported and disclosed in the financial statements and accompanying notes. Such estimates include, but are not limited to, the determination of revenue recognition, deferred revenue, deferred contract acquisition costs, the period of benefit generated from our deferred contract acquisition costs, </span></div><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-weight:400;line-height:144%;">allowance for doubtful accounts, valuation of stock-based awards, useful lives of property and equipment and acquired intangible assets, </span><span style="background-color:#ffffff;color:#000000;font-family:'Times New Roman';font-size:10pt;font-weight:400;line-height:144%;">fair value of acquired intangible assets and goodwill, legal contingencies and valuation of deferred tax assets. Management determines these estimates and assumptions on historical experience and on various other assumptions that are believed to be reasonable. Actual results could differ significantly from these estimates, and such differences may be material to our consolidated financial statements.</span>
CY2019	us-gaap	Foreign Currency Transaction Loss Before Tax ForeignCurrencyTransactionLossBeforeTax	300000	USD
CY2018	us-gaap	Foreign Currency Transaction Loss Before Tax ForeignCurrencyTransactionLossBeforeTax	100000	USD
CY2017	us-gaap	Foreign Currency Transaction Loss Before Tax ForeignCurrencyTransactionLossBeforeTax	100000	USD
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="text-indent:24.75pt;text-align:justify;margin-top:6pt;margin-bottom:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-style:italic;font-weight:700;line-height:144%;">Concentration of Risks </span></div><div style="text-indent:18pt;text-align:justify;margin-top:12pt;margin-bottom:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-weight:400;line-height:144%;">We generate revenue primarily from sale of subscriptions to access our cloud platform, together with related support services. Our sales team, along with our channel partner network of global telecommunications service providers, system integrators and value-added resellers (collectively "channel partners"), sells our services worldwide to organizations of all sizes. Due to the nature of our services and the terms and conditions of our contracts with our channel partners, our business could be affected unfavorably if we are not able to continue our relationships with them. </span></div><div style="text-indent:18pt;text-align:justify;margin-top:12pt;margin-bottom:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-weight:400;line-height:144%;">Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash, cash equivalents, short-term investments and accounts receivable. Although we deposit our cash with multiple financial institutions, the deposits, at times, may exceed federally insured limits. Cash equivalents and short-term investments consist of highly liquid investments in money market funds, U.S. treasury, U.S. agency securities and corporate debt securities, which are invested through financial institutions in the United States.</span></div>We grant credit to our customers in the normal course of business. We monitor the financial condition of our customers to reduce credit risk.
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	302836000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	190174000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	125717000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	302836000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	190174000	USD
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	125717000	USD
CY2019	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	143900000	USD
CY2018	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	85300000	USD
CY2017	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	58500000	USD
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	554200000	USD
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.55
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2019Q3	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.98
CY2019	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	18651000	USD
CY2018Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	55910000	USD
CY2017Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	34662000	USD
CY2016Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	21137000	USD
CY2019	zs	Capitalization Of Contract Acquisition Costs CapitalizationOfContractAcquisitionCosts	32526000	USD
CY2018	zs	Capitalization Of Contract Acquisition Costs CapitalizationOfContractAcquisitionCosts	34429000	USD
CY2017	zs	Capitalization Of Contract Acquisition Costs CapitalizationOfContractAcquisitionCosts	21999000	USD
CY2018	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	13181000	USD
CY2017	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	8474000	USD
CY2019Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	69785000	USD
CY2018Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	55910000	USD
CY2017Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	34662000	USD
CY2019Q3	us-gaap	Capitalized Contract Cost Net Current CapitalizedContractCostNetCurrent	21219000	USD
CY2018Q3	us-gaap	Capitalized Contract Cost Net Current CapitalizedContractCostNetCurrent	16136000	USD
CY2017Q3	us-gaap	Capitalized Contract Cost Net Current CapitalizedContractCostNetCurrent	10469000	USD
CY2019Q3	us-gaap	Capitalized Contract Cost Net Noncurrent CapitalizedContractCostNetNoncurrent	48566000	USD
CY2018Q3	us-gaap	Capitalized Contract Cost Net Noncurrent CapitalizedContractCostNetNoncurrent	39774000	USD
CY2017Q3	us-gaap	Capitalized Contract Cost Net Noncurrent CapitalizedContractCostNetNoncurrent	24193000	USD
CY2019Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	69785000	USD
CY2018Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	55910000	USD
CY2017Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	34662000	USD
CY2019Q3	us-gaap	Accrued Sales Commission Current And Noncurrent AccruedSalesCommissionCurrentAndNoncurrent	9000000.0	USD
CY2018Q3	us-gaap	Accrued Sales Commission Current And Noncurrent AccruedSalesCommissionCurrentAndNoncurrent	10000000.0	USD
CY2019	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	0	USD
CY2018	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	0	USD
CY2018Q3	us-gaap	Restricted Cash RestrictedCash	600000	USD
CY2019Q3	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2019Q3	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	3700000	USD
CY2018Q3	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	1800000	USD
CY2017Q3	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	400000	USD
CY2019Q3	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	1000000.0	USD
CY2018Q1	zs	Conversion Of Stock Conversion Ratio ConversionOfStockConversionRatio	1
CY2018Q3	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	900000	USD
CY2017Q3	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	1200000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Stock Issued Issuance Costs AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts	6200000	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	8600000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	3400000	USD
CY2017	us-gaap	Advertising Expense AdvertisingExpense	1800000	USD
CY2019	us-gaap	Guarantees Indemnifications And Warranties Policies GuaranteesIndemnificationsAndWarrantiesPolicies	<div style="text-indent:24.75pt;text-align:justify;margin-top:6pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-style:italic;font-weight:700;line-height:144%;">Warranties and Indemnification</span></div><div style="text-indent:18pt;text-align:justify;margin-top:12pt;margin-bottom:9pt;"><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman';font-size:10pt;font-weight:400;line-height:144%;">Our cloud platform is generally warranted to be free of defects under normal use and to perform substantially in accordance with the subscription agreement. Additionally, our contracts generally include provisions for indemnifying customers and channel partners against liabilities if our services infringe or misappropriate a third party’s intellectual property rights. Costs and liabilities incurred as a result of warranties and indemnification obligations were not material during the periods presented.</span></div>
CY2018Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2018Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	285778000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	462000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	78000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	286162000	USD
CY2019Q3	zs	Cash Equivalents And Available For Sale Securities At Cost CashEquivalentsAndAvailableForSaleSecuritiesAtCost	340814000	USD
CY2019Q3	zs	Cash Equivalents And Short Term Investments Gross Unrealized Gains CashEquivalentsAndShortTermInvestmentsGrossUnrealizedGains	462000	USD
CY2019Q3	zs	Cash Equivalents And Short Term Investments Gross Unrealized Losses CashEquivalentsAndShortTermInvestmentsGrossUnrealizedLosses	78000	USD
CY2019Q3	zs	Cash Equivalents And Short Term Investments Estimated Fair Value CashEquivalentsAndShortTermInvestmentsEstimatedFairValue	341198000	USD
CY2018Q3	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	104905000	USD
CY2018Q3	zs	Cash Equivalents Gross Unrealized Gains CashEquivalentsGrossUnrealizedGains	0	USD
CY2018Q3	zs	Cash Equivalents Gross Unrealized Losses CashEquivalentsGrossUnrealizedLosses	1000	USD
CY2018Q3	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	104904000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	163083000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1000	USD
CY2018Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	124000	USD
CY2018Q3	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	162960000	USD
CY2018Q3	zs	Cash Equivalents And Available For Sale Securities At Cost CashEquivalentsAndAvailableForSaleSecuritiesAtCost	267988000	USD
CY2018Q3	zs	Cash Equivalents And Short Term Investments Gross Unrealized Gains CashEquivalentsAndShortTermInvestmentsGrossUnrealizedGains	1000	USD
CY2018Q3	zs	Cash Equivalents And Short Term Investments Gross Unrealized Losses CashEquivalentsAndShortTermInvestmentsGrossUnrealizedLosses	125000	USD
CY2018Q3	zs	Cash Equivalents And Short Term Investments Estimated Fair Value CashEquivalentsAndShortTermInvestmentsEstimatedFairValue	267864000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	196046000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	196194000	USD
CY2019Q3	zs	Debt Securities Available For Sale Maturity After One Through Two Years Amortized Cost DebtSecuritiesAvailableForSaleMaturityAfterOneThroughTwoYearsAmortizedCost	89732000	USD
CY2019Q3	zs	Debt Securities Available For Sale Maturity After One Through Two Years Fair Value DebtSecuritiesAvailableForSaleMaturityAfterOneThroughTwoYearsFairValue	89968000	USD
CY2019Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	285778000	USD
CY2019Q3	us-gaap	Available For Sale Securities Debt Securities Current AvailableForSaleSecuritiesDebtSecuritiesCurrent	286162000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	56548000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	62000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	18356000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	16000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	74904000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	78000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	157016000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	124000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	0	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	157016000	USD
CY2018Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	124000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	74783000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	44166000	USD
CY2019Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	33737000	USD
CY2018Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	24401000	USD
CY2019Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	41046000	USD
CY2018Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	19765000	USD
CY2019	zs	Depreciation Depletion And Amortization Excluding Amortization Of Deferred Contract Costs DepreciationDepletionAndAmortizationExcludingAmortizationOfDeferredContractCosts	10400000	USD
CY2018	zs	Depreciation Depletion And Amortization Excluding Amortization Of Deferred Contract Costs DepreciationDepletionAndAmortizationExcludingAmortizationOfDeferredContractCosts	8000000.0	USD
CY2017	zs	Depreciation Depletion And Amortization Excluding Amortization Of Deferred Contract Costs DepreciationDepletionAndAmortizationExcludingAmortizationOfDeferredContractCosts	6800000	USD
CY2018Q3	us-gaap	Goodwill Goodwill	0	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7479000	USD
CY2019Q3	us-gaap	Goodwill Goodwill	7479000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	0	USD
CY2019	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	9616000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	9616000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	0	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	908000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	908000	USD
CY2018Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	0	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8708000	USD
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P3Y6M
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	2602000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2601000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1994000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1490000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	21000	USD
CY2019Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	8708000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	4624000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5836000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	4871000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	6143000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	6509000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	15977000	USD
CY2019Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	43960000	USD
CY2019	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	3000000.0	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	2500000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	1700000	USD
CY2019Q3	us-gaap	Other Commitment Due In Next Twelve Months OtherCommitmentDueInNextTwelveMonths	11766000	USD
CY2019Q3	us-gaap	Other Commitment Due In Second Year OtherCommitmentDueInSecondYear	9890000	USD
CY2019Q3	us-gaap	Other Commitment Due In Third Year OtherCommitmentDueInThirdYear	5533000	USD
CY2019Q3	us-gaap	Other Commitment Due In Fourth Year OtherCommitmentDueInFourthYear	106000	USD
CY2019Q3	us-gaap	Other Commitment OtherCommitment	27295000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	13800000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	9400000	USD
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	6900000	USD
CY2019Q3	us-gaap	Purchase Obligation PurchaseObligation	2500000	USD
CY2018Q1	zs	Temporary Equity Accretion Value TemporaryEquityAccretionValue	24700000	USD
CY2018Q3	us-gaap	Purchase Obligation PurchaseObligation	3100000	USD
CY2018Q1	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	72500750	shares
CY2018Q1	zs	Conversion Of Stock Conversion Ratio ConversionOfStockConversionRatio	1
CY2018Q1	us-gaap	Temporary Equity Carrying Amount Attributable To Parent TemporaryEquityCarryingAmountAttributableToParent	207300000	USD
CY2018	us-gaap	Temporary Equity Accretion To Redemption Value TemporaryEquityAccretionToRedemptionValue	6300000	USD
CY2017	us-gaap	Temporary Equity Accretion To Redemption Value TemporaryEquityAccretionToRedemptionValue	9600000	USD
CY2019Q3	zs	Common Stock Number Of Votes For Each Share CommonStockNumberOfVotesForEachShare	1	vote
CY2019Q3	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	31751000	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	15708000	shares
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	16175000	shares
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	6.20
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y1M6D
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	470860000	USD
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	6277000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	4.76
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	300859000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	1037000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	6.77
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	8861000	shares
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	7.16
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P4Y7M6D
CY2019Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	683294000	USD
CY2018Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	5499000	shares
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CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9919000	USD
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CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-36874000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	6233000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-2000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	4146000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	2291000	USD
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CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-34583000	USD
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CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	0	USD
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CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	31000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	2325000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1480000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	874000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2389000	USD
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CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	0	USD
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CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	0	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-108000	USD
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CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-28000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1646000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-141000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-28000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	743000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1337000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	877000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.340
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CY2018	zs	Effective Income Tax Rate Reconciliation Provision To Return Adjustments EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustments	0.028
CY2017	zs	Effective Income Tax Rate Reconciliation Provision To Return Adjustments EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustments	-0.003
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CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0
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CY2017	zs	Effective Income Tax Rate Reconciliation Tax Withholding Percent EffectiveIncomeTaxRateReconciliationTaxWithholdingPercent	0
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.001
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.027
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.041
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.025
CY2019Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	87413000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	41794000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	1763000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	2863000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	14752000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	6071000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	10330000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	6118000	USD
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CY2018Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	784000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	560000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment	303000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	232000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	347000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	121162000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	58280000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	103732000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	45578000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	17430000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	12702000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	1178000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	0	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	15906000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	12561000	USD
CY2019Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	89000	USD
CY2018Q3	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	0	USD
CY2019Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	17173000	USD
CY2018Q3	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	12561000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	257000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	141000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	45578000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	51493000	USD
CY2016Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	40299000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	58154000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	-5915000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	11194000	USD
CY2019Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	103732000	USD
CY2018Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	45578000	USD
CY2017Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	51493000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	58200000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	-5900000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Period Increase Decrease ValuationAllowancesAndReservesPeriodIncreaseDecrease	11200000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4400000	USD
CY2018	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	6332000	USD
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CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1746000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	876000	USD
CY2018Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	2622000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	288000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2093000	USD
CY2019Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4427000	USD
CY2018Q1	zs	Conversion Of Stock Conversion Ratio ConversionOfStockConversionRatio	1
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-28655000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-33646000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-35460000	USD
CY2019	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	0	USD
CY2017	us-gaap	Temporary Equity Accretion To Redemption Value Adjustment TemporaryEquityAccretionToRedemptionValueAdjustment	9570000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-28655000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-39978000	USD
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zsexhibit211fy1910k.htm	Edgar Link	pending
zsexhibit231fy1910k.htm	Edgar Link	pending
zsexhibit311fy1910k.htm	Edgar Link	pending
zsexhibit312fy1910k.htm	Edgar Link	pending
zsexhibit321fy1910k.htm	Edgar Link	pending
zsexhibit43fy1910k.htm	Edgar Link	pending

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$ZS
Zscaler, Inc. Stock $zs

2019 Q3 Form 10-K Financial Statement

#000171368319000030 Filed on September 18, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ZS Zscaler, Inc. Stock $zs

2019 Q3 Form 10-K Financial Statement

#000171368319000030 Filed on September 18, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$ZS
Zscaler, Inc. Stock $zs