SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Additional Disclosures [Abstract]
Vested share-based awards withheld to satisfy income tax obligations (in shares)			29,736	30,447
Vested share-based awards withheld to satisfy income tax obligations			$ 2,600	$ 2,500
Compensation Expense [Abstract]
Share-based compensation expense	$ 1,400	$ 1,500	$ 2,903	2,711
401 (k) Profit Sharing Plan [Abstract]
Period over which employer contribution is vested			4 years
Contribution to profit sharing plan	$ 400	$ 400	$ 800	$ 700
Restricted Stock [Member]
Number of Shares [Rollforward]
Nonvested (in shares)			203,828
Granted (in shares)			72,764
Vested (in shares)			(89,906)
Nonvested (in shares)	186,686		186,686
Weighted Average Grant-date Fair Value [Rollforward]
Nonvested (in dollars per share)			$ 72.33
Granted (in dollars per share)			86.22
Vested (in dollars per share)			66.01
Nonvested (in dollars per share)	$ 80.79		$ 80.79
Additional Disclosures [Abstract]
Vested share-based awards withheld to satisfy income tax obligations (in shares)			29,736
Vested share-based awards withheld to satisfy income tax obligations			$ 2,600
Compensation Expense [Abstract]
Unrecognized compensation expense	$ 13,400		$ 13,400
Unrecognized compensation expense, period for recognition			45 months
2008 Director LTIP [Member] | Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)			5,495	6,151
2012 Employee LTIP [Member] | Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)			67,269	118,974