STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended		174 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Aug. 13, 2015
STOCKHOLDERS' EQUITY [Abstract]
Authorized number of shares under stock repurchase program (in shares)				500,000
Common stock repurchased during the period (in shares)	116,302	700,113	5,700,000
Average cost of share repurchased (in dollars per share)	$ 76.21	$ 50.93	$ 21.15
Common stock repurchased during the period	$ 8.9	$ 35.7	$ 120.5
Shares repurchased to satisfy tax withholding obligation (in shares)	30,447	35,158