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 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

Amount of contractual obligation to be paid in remainder of current fiscal year.

No definition available.

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

- 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 Including Lease Not Yet Commenced, Payments, Due

No definition available.

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

Lessee, Operating Lease Including Lease Not Yet Commenced, Payments, Due Year Five And Thereafter

No definition available.

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

Lessee, Operating Lease Including Lease Not Yet Commenced, Payments, Due Year Four

No definition available.

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

Lessee, Operating Lease Including Lease Not Yet Commenced, Payments, Due Year One

No definition available.

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

Lessee, Operating Lease Including Lease Not Yet Commenced, Payments, Due Year Three

No definition available.

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

Lessee, Operating Lease Including Lease Not Yet Commenced, Payments, Due Year Two

No definition available.

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

Lessee, Operating Lease Including Lease Not Yet Commenced, Payments, Remainder Of Fiscal Year

No definition available.