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EMPLOYEE BENEFIT PLANS - Additional Information (Details) $ in Millions		3 Months Ended		6 Months Ended
	May 11, 2026 USD ($) shares	Jun. 30, 2026 USD ($) shares	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) shares	Jun. 30, 2025 USD ($)	Dec. 31, 2025 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized stock-based compensation expense		$ 15.7		$ 15.7
Recognized stock-based compensation expense, period for recognition				2 years 6 months
Total shares of common stock reserved (in shares) \| shares		74,600,000		74,600,000		49,700,000
Stock-based compensation expense		$ 39.6	$ 23.8	$ 59.9	$ 48.0
Internal-use software and website development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cumulative stock-based compensation expense		$ 2.3	$ 2.0	$ 4.3	$ 3.7
Two Thousand Twenty-One Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of common stock reserved (in shares) \| shares		19,500,000		19,500,000
Udemy Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of common stock reserved (in shares) \| shares		6,500,000		6,500,000
2021 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares of common stock reserved (in shares) \| shares		7,200,000		7,200,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, expiration period				10 years
Vesting period				4 years
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized stock-based compensation expense		$ 189.8		$ 189.8
Recognized stock-based compensation expense, period for recognition				2 years 7 months 6 days
Vesting period				4 years
Restricted Stock Units \| Share-Based Payment Arrangement, Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				1 year
Award vesting rights percentage				25.00%
Restricted Stock Units \| Share-Based Payment Arrangement, Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights percentage				6.25%
Restricted Stock Units \| Share-Based Payment Arrangement, Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				4 years
Award vesting rights percentage				6.25%
Restricted Stock Units \| Udemy Plan \| New Hire Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				1 year
Performance stock units (“PSUs”)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized stock-based compensation expense		$ 2.7		$ 2.7
Recognized stock-based compensation expense, period for recognition				1 year 8 months 12 days
Performance stock units (“PSUs”) \| 2026 Revenue Thresholds Targets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				1 year
Award vesting rights percentage				100.00%
Performance stock units (“PSUs”) \| Minimum \| 2025 Revenue Threshold Targets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award performance targets (percent)		50.00%		50.00%
Performance stock units (“PSUs”) \| Minimum \| 2026 Revenue Thresholds Targets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award performance targets (percent)		50.00%		50.00%
Performance stock units (“PSUs”) \| Maximum \| 2025 Revenue Threshold Targets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award performance targets (percent)		150.00%		150.00%
Performance stock units (“PSUs”) \| Maximum \| 2026 Revenue Thresholds Targets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award performance targets (percent)		200.00%		200.00%
Performance stock units (“PSUs”) \| Share-Based Payment Arrangement, Tranche One \| 2025 Revenue Threshold Targets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				1 year
Award vesting rights percentage				25.00%
Performance stock units (“PSUs”) \| Share-Based Payment Arrangement, Tranche One \| Chief Financial Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				1 year
Award vesting rights percentage				25.00%
Performance stock units (“PSUs”) \| Share-Based Payment Arrangement, Tranche Two \| 2025 Revenue Threshold Targets
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				3 years
Award vesting rights percentage				6.25%
Performance stock units (“PSUs”) \| Share-Based Payment Arrangement, Tranche Two \| Chief Financial Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				3 years
Award vesting rights percentage				6.25%
Udemy, Inc.
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Business combination, conversion of stock (in shares)	0.800
Number of shares issued in combination (in shares) \| shares	116,600,000
Udemy, Inc. \| Director Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Business combination, consideration transferred, equity interest	$ 13.5
Udemy, Inc. \| Replacement Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized stock-based compensation expense	$ 82.7
Recognized stock-based compensation expense, period for recognition	1 year 10 months 24 days
Udemy, Inc. \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Business combination, consideration transferred, equity interest	$ 660.1