SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Additional Disclosures [Abstract]
Vested share-based awards withheld to satisfy income tax obligations (in shares)			41,817	40,092
Vested share-based awards withheld to satisfy income tax obligations			$ 3,000	$ 3,900
Compensation Expense [Abstract]
Share-based compensation expense	$ 2,100	$ 1,900	4,054	3,561
401(k) Profit Sharing Plan [Abstract]
Contribution to profit sharing plan	$ 700	$ 500	$ 1,400	$ 1,000
Restricted Stock [Member]
Number of Shares [Roll Forward]
Nonvested at beginning of period (in shares)			224,000
Granted (in shares)			93,264
Vested (in shares)			(123,011)
Forfeited (in shares)			(293)
Nonvested at end of period (in shares)	193,960		193,960
Weighted Average Grant-date Fair Value [Roll Forward]
Nonvested at beginning of period (in dollars per share)			$ 67.70
Granted (in dollars per share)			72.89
Vested (in dollars per share)			62.04
Forfeited (in dollars per share)			87.18
Nonvested at end of period (in dollars per share)	$ 70.98		$ 70.98
Compensation Expense [Abstract]
Unrecognized compensation expense	$ 12,000		$ 12,000
Unrecognized compensation expense, period for recognition			33 months
2017 Director LTIP [Member] | Restricted Stock [Member]
Number of Shares [Roll Forward]
Granted (in shares)			8,132	8,322
2012 Employee LTIP [Member] | Restricted Stock [Member]
Number of Shares [Roll Forward]
Granted (in shares)			85,132	69,847
Additional Disclosures [Abstract]
Vested share-based awards withheld to satisfy income tax obligations (in shares)			41,817
Vested share-based awards withheld to satisfy income tax obligations			$ 3,000