STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended		168 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Aug. 13, 2015
STOCKHOLDERS' EQUITY [Abstract]
Authorized number of shares under stock repurchase program (in shares)	500,000		500,000	500,000
Common stock repurchased during the period (in shares)	0	651,019	5,600,000
Average cost of share repurchased (in dollars per share)		$ 50.31	$ 20.00
Common stock repurchased during the period		$ 32.8	$ 111.6
Shares repurchased to satisfy tax withholding obligation (in shares)	30,447	35,158
Value of Shares repurchased to satisfy tax withholding obligation	$ 2.5	$ 2.0