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STOCKHOLDERS' EQUITY - Schedule of Common Stock (Details) - shares
 12 Months Ended
Dec. 06, 2022
Mar. 17, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Shares issued, beginning balance (in shares)     65,968,224 66,456,663 69,065,491
Shares outstanding, beginning balance (in shares)     65,968,224 66,456,663 69,065,491
Issuance of common stock from exercise of stock options (in shares)     116,592    
Issuance of common stock for employee stock purchase plan (in shares)     158,134 136,861 236,887
Issuance of common stock for the acquisition of Zenefits (in shares)     193,221 0 0
Repurchase of common stock (in shares) (1,515,258) (3,653,690) (6,398,279) (1,161,909) (3,307,074)
Awards effectively repurchased for required employee withholding taxes (in shares)     (324,092) (285,390) (279,356)
Shares outstanding, ending balance (in shares)     60,555,661 65,968,224 66,456,663
Shares issued, ending balance (in shares)     60,555,661 65,968,224 66,456,663
Restricted Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from vested restricted stock units (in shares)     841,861 748,881 659,689
Equity Option          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from exercise of stock options (in shares)     116,592 73,118 81,026
Employee Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock for employee stock purchase plan (in shares)     158,134 136,861 236,887