STOCKHOLDERS' EQUITY - Schedule of Common Stock (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued and outstanding, beginning balance (in shares)	60,555,661	65,968,224
Shares issued and outstanding, beginning balance (in shares)	60,555,661	65,968,224
Issuance of common stock for the acquisition of Zenefits (in shares)	0	193,221
Repurchase of common stock (in shares)	(1,157,871)	(4,010,945)
Awards effectively repurchased for required employee withholding taxes (in shares)	(49,701)	(46,815)
Shares issued and outstanding, ending balance (in shares)	59,522,954	62,258,896
Shares issued and outstanding, ending balance (in shares)	59,522,954	62,258,896
Issuance of common stock from vested restricted stock units
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vested restricted stock units (in shares)	135,074	126,522
Issuance of common stock from exercise of stock options
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options (in shares)	39,791	28,689