SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Compensation Expense [Abstract]
Total share-based compensation expense	$ 1.5	$ 1.2	$ 2.7	$ 2.2
401 (k) Profit Sharing Plan [Abstract]
Period over which employer contribution is vested			4 years
Contribution to profit sharing plan	$ 0.4	$ 0.3	$ 0.7	$ 0.6
Restricted Stock [Member]
Number of Shares [Rollforward]
Nonvested (in shares)			176,514
Granted (in shares)			125,125
Vested (in shares)			(94,625)
Forfeited (in shares)			(2,321)
Nonvested (in shares)	204,693		204,693
Weighted Average Grant-date Fair Value [Rollforward]
Nonvested (in dollars per share)			$ 52.75
Granted (in dollars per share)			81.76
Vested (in dollars per share)			48.75
Forfeited (in dollars per share)			64.06
Nonvested (in dollars per share)	$ 72.21		$ 72.21
Compensation Expense [Abstract]
Unrecognized compensation expense	$ 13.0		$ 13.0
Unrecognized compensation expense, period for recognition			57 months
2008 Director LTIP [Member] | Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)			6,151	9,390
2012 Employee LTIP [Member] | Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)			118,974	78,165