Segment and geographic information - Summary of Financial Information by Each Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 191,407	$ 200,300
Cost of revenue	62,140	70,857
Gross Profit, Adjusted	136,224	136,385
Content Costs [Member]
Segment Reporting Information [Line Items]
Cost of revenue	(34,607)	(45,177)
Customer Support [Member]
Segment Reporting Information [Line Items]
Cost of revenue	(13,329)	(11,561)
Other segment items
Segment Reporting Information [Line Items]
Cost of revenue	(7,247)	(7,177)
Enterprise
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	132,889	127,748
Gross Profit, Adjusted	101,457	95,984
Enterprise \| Content Costs [Member]
Segment Reporting Information [Line Items]
Cost of revenue	(18,004)	(20,371)
Enterprise \| Customer Support [Member]
Segment Reporting Information [Line Items]
Cost of revenue	(11,501)	(9,885)
Enterprise \| Other segment items
Segment Reporting Information [Line Items]
Cost of revenue	(1,927)	(1,508)
Consumer
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	58,518	72,552
Gross Profit, Adjusted	34,767	40,401
Consumer \| Content Costs [Member]
Segment Reporting Information [Line Items]
Cost of revenue	(16,603)	(24,806)
Consumer \| Customer Support [Member]
Segment Reporting Information [Line Items]
Cost of revenue	(1,828)	(1,676)
Consumer \| Other segment items
Segment Reporting Information [Line Items]
Cost of revenue	$ (5,320)	$ (5,669)

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 41
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
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-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 6: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
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-Name Accounting Standards Codification
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Reference 7: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 22
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

+ Details

Udemy, Inc. 10-Q