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INCOME TAX: Reconciliation of Expected Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Computed expected income tax benefit | $ (7,366) | $ (25,368) | $ (34,763)
Increase (reduction) in income taxes resulting from: |  |  |
State income taxes, net of federal benefit | 691 | (979) | (473)
Research and other tax credits | (3,107) | (4,635) | (1,517)
Nondeductible expenses | 673 | 1,104 | 838
Stock-based compensation | 5,576 | (2,024) | 5,025
Non-U.S. subsidiaries taxed at other rates | (364) | 194 | 230
Adjustment to valuation allowances | 2,520 | 2,230 | (2,245)
Net operating loss carryback taxed at other rates | 0 | 0 | (7,360)
Other, net | 135 | (1,054) | (11)
Total | $ (1,242) | $ (30,532) | $ (40,276)

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