RESTRUCTURING CHARGES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 193	$ 13,895		$ 466	$ 17,514
Employee-Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges						1,700	$ 5,100
One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges					300
VSP
Restructuring Cost and Reserve [Line Items]
Restructuring charges				$ 17,300	$ 100	$ 16,100
Forecast | One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 100