Represents the duration of purchase period under ESPP.

No definition available.

Name:	crwd_EmployeeStockPurchasePlanDurationOfPurchasePeriod
Namespace Prefix:	crwd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of purchase periods under ESPP.

+ References

No definition available.

+ Details

Name:	crwd_EmployeeStockPurchasePlanNumberOfPurchasePeriod
Namespace Prefix:	crwd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the duration of offering period under ESPP.

+ References

No definition available.

+ Details

Name:	crwd_EmployeeStockPurchasePlanOfferingPeriod
Namespace Prefix:	crwd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Annual increase to stock available for issuance as a threshold percentage of outstanding shares of Company's capital stock as of the last day of the immediately preceding fiscal year, under the plan.

+ References

No definition available.

+ Details

Name:	crwd_EmployeeStockPurchasePlanPercentageOfEligibleCompensation
Namespace Prefix:	crwd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Annual increase to stock available for issuance as a threshold percentage of outstanding shares of Company's capital stock as of the last day of the immediately preceding fiscal year, under the plan.

+ References

No definition available.

+ Details

Name:	crwd_MaximumNumberOfSharesEachParticipantCanPurchaseDuringPurchasePeriod
Namespace Prefix:	crwd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of quarterly installments for share based payment awards.

+ References

No definition available.

+ Details

Name:	crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfQuarterlyInstallments
Namespace Prefix:	crwd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Payment Arrangement, Plan Modification, Number of Contribution Changes

+ References

No definition available.

+ Details

Name:	crwd_ShareBasedPaymentArrangementPlanModificationNumberOfContributionChanges
Namespace Prefix:	crwd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of common stock related to early exercised stock options subject to repurchase.

+ References

No definition available.

+ Details

Name:	crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNumberOfSharesRelatedToEarlyExercisedStockOptionsSubjectToRepurchase
Namespace Prefix:	crwd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of common stock related to early exercised stock options subject to repurchase.

+ References

No definition available.

+ Details

Name:	crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsValueRelatedToEarlyExercisedStockOptionsSubjectToRepurchase
Namespace Prefix:	crwd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents information relates to stock issued during period shares early exercise of employee options.

+ References

No definition available.

+ Details

Name:	crwd_StockIssuedDuringPeriodSharesEarlyExerciseOfEmployeeOptions
Namespace Prefix:	crwd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of vesting schedules.

+ References

No definition available.

+ Details

Name:	crwd_VestingScheduleNumber
Namespace Prefix:	crwd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_EmployeeRelatedLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PlanNameAxis=crwd_EquityIncentivePlan2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=crwd_EmployeeStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=crwd_ServiceBasedRestrictedStockUnitsVestingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=crwd_PerformanceBasedRestrictedStockUnitsVestingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=crwd_PerformanceBasedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2019 unit_Standard_item shares	Sep. 30, 2018 unit_Standard_installment unit_Standard_tranche	Jul. 31, 2020 USD ($) $ / shares shares	Jul. 31, 2019 USD ($) $ / shares	Jul. 31, 2020 USD ($) changesInContribution $ / shares shares	Jul. 31, 2019 USD ($) $ / shares	Jan. 31, 2020 USD ($) shares	Jun. 14, 2019 USD ($)
Stock Based Compensation
Employee payroll contributions accrued			$ 36,099		$ 36,099		$ 36,810
Number of increases in contribution \| changesInContribution					1
2019 Plan \| Class A common stock
Stock Based Compensation
Maximum number of shares of common stock that may be issued (in shares) \| shares	8,750,000
Threshold percentage of outstanding shares	2.00%
Employee Stock Purchase Plan
Stock Based Compensation
Threshold percentage of outstanding shares	1.00%
Offering period	24 months
Number of purchase periods \| unit_Standard_item	4
Duration of purchase periods	6 months
Percentage of eligible compensation	15.00%
Maximum number of shares each participant can purchase during purchase period (in shares) \| shares	2,500
Purchase price, threshold percentage of fair market value	85.00%
Employee payroll contributions accrued			6,300		$ 6,300
Plan modification, incremental cost			$ 800		$ 800
Employee Stock Purchase Plan \| Class A common stock
Stock Based Compensation
Maximum number of shares of common stock that may be issued (in shares) \| shares	3,500,000
Service-based vesting
Stock Based Compensation
Number of vesting schedules \| unit_Standard_tranche		3
Stock options
Stock Based Compensation
Options unvested (in shares) \| shares			607,201		607,201
Aggregate intrinsic value of options vested and exercisable			$ 523,100		$ 523,100		$ 469,600
Weighted-average remaining contractual term of options vested and exercisable (in years)					6 years 6 months		6 years 8 months 12 days
Weighted-average grant date fair value of options granted (in usd per share) \| $ / shares			$ 32.91	$ 13.45	$ 32,910,000	$ 9.51
Total intrinsic value of options exercised			$ 242,800	$ 80,900	$ 354,000	$ 89,700
Aggregate intrinsic value of stock options outstanding			1,050,000		$ 1,050,000		$ 816,300
Weighted-average remaining contractual term of stock options outstanding (in years)					7 years 2 months 12 days		7 years 4 months 24 days
Total unrecognized stock-based compensation expenses related to unvested options			$ 28,600		$ 28,600		$ 34,700
Expected to be amortized over weighted-average vesting period (in years)			2 years 1 month 6 days		1 year 10 months 24 days
Shares issued for exercise of stock options (in shares) \| shares			0		0
Number of shares of common stock related to early exercised stock options subject to repurchase (in shares) \| shares			728,462		728,462		984,417
Value of common stock related to early exercised stock options subject to repurchase			$ 7,000		$ 7,000		$ 8,700
Performance-based vesting
Stock Based Compensation
Stock-based compensation expense deferred								$ 17,300
RSUs
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)					2 years 8 months 12 days
Total unrecognized stock-based compensation expenses related to unvested RSUs			283,900		$ 283,900
PSUs
Stock Based Compensation
Threshold percentage of outstanding shares					130.00%
Expected to be amortized over weighted-average vesting period (in years)					1 year 9 months 18 days
Total unrecognized stock-based compensation expenses related to unvested RSUs			$ 33,600		$ 33,600
Vesting period					4 years
Vesting one \| Service-based vesting
Stock Based Compensation
Vesting percentage					25.00%
Number of quarterly installments \| unit_Standard_installment		12
Vesting two \| Service-based vesting
Stock Based Compensation
Number of quarterly installments \| unit_Standard_installment		16
Vesting three \| Service-based vesting
Stock Based Compensation
Number of quarterly installments \| unit_Standard_installment		8