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INCOME TAXES: - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Income Tax Examination [Line Items]    
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 31.50%  
Capital loss carryforward $ 2,099 $ 0
Deferred tax assets, valuation allowance $ 38,321 18,947
Unrecognized tax benefits that would impact effective tax rate   19,600
Unrecognized tax benefits, income tax penalties and interest accrued   400
Decrease in unrecognized tax benefits is reasonably possible   800
Internal Revenue Service (IRS)    
Income Tax Examination [Line Items]    
Operating loss carryforwards   8,300
Foreign Tax Authority    
Income Tax Examination [Line Items]    
Operating loss carryforwards   37,400
State and Local Jurisdiction    
Income Tax Examination [Line Items]    
Operating loss carryforwards   22,600
Indefinite Tax Year | Foreign Tax Authority    
Income Tax Examination [Line Items]    
Operating loss carryforwards   $ 33,900