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INCOME TAX: Reconciliation of Expected Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
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)