STOCKHOLDERS' EQUITY - Schedule of Common Stock (Details) - shares			1 Months Ended		12 Months Ended
	Dec. 06, 2022	Mar. 17, 2022	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued, beginning balance (in shares)					60,555,661	65,968,224	66,456,663
Shares outstanding, beginning balance (in shares)					60,555,661	65,968,224	66,456,663
Issuance of common stock from exercise of stock options (in shares)					182,067
Issuance of common stock for employee stock purchase plan (in shares)					175,446	158,134	136,861
Issuance of common stock for the acquisition of Zenefits (in shares)					0	193,221	0
Repurchase of common stock (in shares)	(1,515,258)	(3,653,690)	(3,364,486)	(5,981,308)	(10,734,790)	(6,398,279)	(1,161,909)
Awards effectively repurchased for required employee withholding taxes (in shares)					(288,492)	(324,092)	(285,390)
Shares outstanding, ending balance (in shares)					50,664,471	60,555,661	65,968,224
Shares issued, ending balance (in shares)					50,664,471	60,555,661	65,968,224
Restricted Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vested restricted stock units (in shares)					774,579	841,861	748,881
Equity Option
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options (in shares)					182,067	116,592	73,118
Employee Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)					175,446	158,134	136,861