TREASURY STOCK - Narrative (Details) - USD ($)	12 Months Ended			23 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	May 19, 2015	Apr. 22, 2014
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period, value	$ 89,555,000	$ 311,850,000	$ 51,714,000
Restricted stock units
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period (in shares)	320,572	256,514	247,568
Shares repurchased during the period, value	$ 9,600,000	$ 9,100,000	$ 10,800,000
Share repurchase program, April 2014
Equity, Class of Treasury Stock [Line Items]
Shares repurchased during the period (in shares)		67,752	756,700	824,452
Shares repurchased during the period, value		$ 2,800,000	$ 31,500,000	$ 34,300,000
Additional authorized stock repurchase amount						$ 100,000,000
Share repurchase program, May 2015
Equity, Class of Treasury Stock [Line Items]
Stock authorized to repurchase under stock repurchase program (in shares)					20,000,000
Shares repurchased during the period (in shares)	3,148,426	10,078,136
Shares repurchased during the period, value	$ 80,000,000	$ 300,000,000
Common stock available to be purchased	6,773,438