INCOME TAXES: - Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Carryforwards
Capital loss carryforward	$ 3,414
Valuation allowance	47,074	$ 46,602
No expiration dates
Carryforwards
Tax credit carryforwards	5,900
Expire if not used by 2022
Carryforwards
Capital loss carryforward	8,400
State jurisdiction
Carryforwards
Net operating loss carryforwards	69,800
Tax credit carryforwards	20,100
Tax credit carryforwards that will be credited to additional paid-in capital when realized	2,700
State jurisdiction | Operating loss and tax credit carryforwards
Carryforwards
Valuation allowance	4,100
Foreign jurisdiction
Carryforwards
Net operating loss carryforwards	129,500
Foreign jurisdiction | No expiration dates
Carryforwards
Net operating loss carryforwards	129,200
Foreign jurisdiction | Non-US with history of losses
Carryforwards
Valuation allowances against loss carryforwards	40,100
Foreign jurisdiction | Non-US with historical profits and forecasted continuing profits
Carryforwards
Valuation allowance	0
U.S. Federal
Carryforwards
Net operating loss carryforwards	16,800
Tax credit carryforwards	700
Tax credit carryforwards that will be credited to additional paid-in capital when realized	700
U.S. Federal | Operating loss and tax credit carryforwards
Carryforwards
Valuation allowance	$ 2,900