SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 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	$ 1,500	$ 1,500	$ 4,520	4,210
401 (k) Profit Sharing Plan [Abstract]
Period over which employer contribution is vested			4 years
Contribution to profit sharing plan	$ 500	$ 400	$ 1,200	$ 1,100
Restricted Stock [Member]
Number of Shares [Rollforward]
Nonvested at beginning of period (in shares)			203,828
Granted (in shares)			72,961
Vested (in shares)			(90,356)
Forfeited (in shares)			(349)
Nonvested at end of period (in shares)	186,084		186,084
Weighted Average Grant-date Fair Value [Rollforward]
Nonvested at beginning of period(in dollars per share)			$ 72.33
Granted (in dollars per share)			86.24
Vested (in dollars per share)			65.99
Forfeited (in dollars per share)			76.87
Nonvested at end of period (in dollars per share)	$ 80.86		$ 80.86
Compensation Expense [Abstract]
Unrecognized compensation expense	$ 11,800		$ 11,800
Unrecognized compensation expense, period for recognition			42 months
2008 Director LTIP [Member] | Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)			5,692	6,383
2012 Employee LTIP [Member] | Restricted Stock [Member]
Number of Shares [Rollforward]
Granted (in shares)			67,269	118,974
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