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INCOME TAXES: - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Apr. 01, 2020 | Mar. 31, 2019
Income Tax Examination [Line Items] |  |  |
Deferred tax assets, valuation allowance | $ 32,971 |  | $ 34,356
Gross unrecognized tax benefits that would impact effective tax rate | 23,400 |  |
Accrued interest and penalties related to tax positions on tax returns | 2,500 |  |
Increase in accrued interest and penalties related to tax positions on tax returns | 2,100 |  |
Scenario, Forecast |  |  |
Income Tax Examination [Line Items] |  |  |
Income tax examination, liability (refund) adjustment from settlement with taxing authority |  | $ (32,000) |
Internal Revenue Service (IRS) |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 21,700 |  |
Federal tax authority |  |  |
Income Tax Examination [Line Items] |  |  |
State credit carryforwards that will not expire | 11,500 |  |
State and Local Jurisdiction |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 70,000 |  |
State credit carryforwards that will not expire | 9,500 |  |
Tax credit carryforward, amount | 2,100 |  |
Foreign Tax Authority |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | 99,900 |  |
Deferred tax assets, valuation allowance | 26,600 |  |
Indefinite Tax Year | Foreign Tax Authority |  |  |
Income Tax Examination [Line Items] |  |  |
Operating loss carryforwards | $ 93,300 |  |

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