PENSION BENEFIT PLANS - Schedule of Net Periodic Pension Costs of Noncontributory Defined Benefit Pension Plans (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 81	$ 49	$ 165	$ 49
Interest cost	157	75	321	75
Amortization of net loss		(80)	0	(80)
Net periodic pension cost	$ 238	$ 204	$ 486	$ 204