Stock-Based Compensation - Schedule of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 2025
Equity Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 9,961	$ 12,962	$ 19,995	$ 25,621
Liability Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	58	893	177	2,725
Income Statement Location [Axis]: us-gaap:CostOfRevenue \| Equity Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	488	729	966	1,400
Income Statement Location [Axis]: us-gaap:CostOfRevenue \| Liability Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	3	225	9	716
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense \| Equity Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	2,952	3,818	6,312	6,952
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense \| Liability Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	21	514	65	1,201
Income Statement Location [Axis]: us-gaap:SellingAndMarketingExpense \| Equity Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	1,841	704	3,482	3,115
Income Statement Location [Axis]: us-gaap:SellingAndMarketingExpense \| Liability Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	30	100	91	573
Income Statement Location [Axis]: yext:GeneralAndAdministrativeExpenseAdjusted \| Equity Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	4,680	7,711	9,235	14,154
Income Statement Location [Axis]: yext:GeneralAndAdministrativeExpenseAdjusted \| Liability Classified Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 4	$ 54	$ 12	$ 235