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Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue recognized	$ 26,200		$ 239,400
Revenue, remaining performance obligation, amount	2,600,000		2,600,000
Total revenues	$ 638,655	$ 608,765	$ 1,871,109	$ 1,785,883
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage (as percent)	54.00%		54.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage (as percent)	46.00%		46.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period
Minimum
Disaggregation of Revenue [Line Items]
Remaining performance obligations subscription term			1 month
Maximum
Disaggregation of Revenue [Line Items]
Remaining performance obligations subscription term			5 years
RingEX and RingCentral Contact Center Solutions | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as percent)	90.00%	90.00%	90.00%	90.00%
RingCentral Contact Center Solutions | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk (as percent)	10.00%	10.00%	10.00%	10.00%
Product
Disaggregation of Revenue [Line Items]
Total revenues	$ 11,400	$ 12,800	$ 35,000	$ 38,500

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