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BENEFIT PLANS (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended 30 Months Ended
Jan. 01, 2022
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
United States | IAC Plan            
Defined Contribution Plan Disclosure            
Employee contribution limit per calendar year (up to) (as a percent of pre-tax earnings)     50.00%      
Employer contribution per dollar employee contributes up to contribution limit   50.00%       100.00%
Employer contribution limit per calendar year (as a percent of compensation)   6.00%       10.00%
Defined contribution plan contributions     $ 5.1 $ 3.5 $ 2.0  
United States | Subsequent Event | Vimeo Plan            
Defined Contribution Plan Disclosure            
Employer contribution per dollar employee contributes up to contribution limit 100.00%          
Employer contribution limit per calendar year (as a percent of compensation) 10.00%          
All Other Countries | IAC Plan            
Defined Contribution Plan Disclosure            
Defined contribution plan contributions     $ 1.5 $ 0.9 $ 0.6