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

Amount of contractual obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

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

Amount of contractual obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

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

Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

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

Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

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

Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.

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

- References

No definition available.

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

- References

No definition available.

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

Contractual Obligation, Due In Fifth Year And Thereafter

No definition available.

Name:	yext_ContractualObligationDueInFifthYearAndThereafter
Namespace Prefix:	yext_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Liability, to be Paid, Including Off-Balance Sheet

No definition available.

Name:	yext_LesseeOperatingLeaseLiabilityToBePaidIncludingOffBalanceSheet
Namespace Prefix:	yext_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Liability, to be Paid, Including Off-Balance Sheet, Year Five

No definition available.

Name:	yext_LesseeOperatingLeaseLiabilityToBePaidIncludingOffBalanceSheetYearFive
Namespace Prefix:	yext_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Liability, to be Paid, Including Off-Balance Sheet, Year Five and Thereafter

No definition available.

Name:	yext_LesseeOperatingLeaseLiabilityToBePaidIncludingOffBalanceSheetYearFiveAndThereafter
Namespace Prefix:	yext_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Liability, to be Paid, Including Off-Balance Sheet, Year Four

No definition available.

Name:	yext_LesseeOperatingLeaseLiabilityToBePaidIncludingOffBalanceSheetYearFour
Namespace Prefix:	yext_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Liability, to be Paid, Including Off-Balance Sheet, Year One

No definition available.

Name:	yext_LesseeOperatingLeaseLiabilityToBePaidIncludingOffBalanceSheetYearOne
Namespace Prefix:	yext_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Liability, to be Paid, Including Off-Balance Sheet, Year Three

No definition available.

Name:	yext_LesseeOperatingLeaseLiabilityToBePaidIncludingOffBalanceSheetYearThree
Namespace Prefix:	yext_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Lessee, Operating Lease, Liability, to be Paid, Including Off-Balance Sheet, Year Two

No definition available.