INCOME TAXES: Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Current	$ 4,087	$ 284	$ 251
Deferred	3,668	3,103	3,175
Total	$ 7,755	$ 3,387	$ 3,426