Stock-based Compensation - Equity Awards (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised		$ 1,100		$ 4,300
Option, unrecognized stock-based compensation expense		11,800		11,800
Stock-based compensation expense, including cash settled		247,276	$ 276,820	778,592	$ 764,592
Restricted Stock Units | Qualtrics RSU Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of RSUs that vested		20,200	15,300	704,000	184,400
Unrecognized stock-based compensation expense		2,251,000		$ 2,251,000
Period for recognition (in years)				2 years 7 months 6 days
Share-based Payment Arrangement, Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)				2 years
Employee Stock | Qualtrics Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum contribution percentage (per period)	1.00%
Maximum contribution percentage (per period)	20.00%
Purchase price of common stock, percent of market price	85.00%
Maximum value of shares per employee	$ 15
Maximum value of shares that may be purchased by employees				$ 25
Stock-based compensation expense, including cash settled		$ 9,300	$ 4,300	$ 19,600	$ 11,900