STOCK-BASED COMPENSATION - Summary of RSU Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	May 07, 2020	Mar. 31, 2020
Weighted-Average Grant Date Fair Value
Award vesting period		4 years
Restricted securities units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option expense		$ 29,629
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized		2 years 10 months 20 days
Shares (in thousands)
Unvested — Beginning balance (in shares)		1,741,000
Granted (in shares)		188,000
Vested (in shares)		(107,000)
Forfeited (in shares)		(92,000)
Unvested — Ending balance (in shares)		1,730,000
Weighted-Average Grant Date Fair Value
Unvested — Beginning balance (in usd per share)		$ 18.55
Granted (in usd per share)		70.26
Vested (in usd per share)		13.12
Forfeited (in usd per share)		15.58
Unvested — Ending balance (in usd per share)		$ 24.67
Award vesting period		4 years
Performance Shares [Member]
Shares (in thousands)
Unvested — Ending balance (in shares)		1,252,500
Subsequent Event | Restricted stock units
Shares (in thousands)
Granted (in shares)	844,224
Weighted-Average Grant Date Fair Value
Compensation not yet recognized, awards other than options	$ 28,000
Maximum | Employees and non-employee directors | Restricted stock units
Weighted-Average Grant Date Fair Value
Award vesting period		4 years