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INCOME TAXES: - Reconciliation of Expected Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]      
Computed expected income tax benefit $ (25,368) $ (34,763) $ (37,665)
Income Tax Expense (Benefit) Continuing Operations Income Tax Reconciliation Increase (Decrease) [Abstract]      
State income taxes, net of federal benefit (979) (473) (5,998)
Research and other tax credits (4,635) (1,517) (3,141)
Nondeductible expenses 1,104 838 426
Stock-based compensation (2,024) 5,025 (5,350)
Non-U.S. subsidiaries taxed at other rates 194 230 1,343
Adjustment to valuation allowances 2,230 (2,245) 5,204
Net operating loss carryback taxed at other rates 0 (7,360) 0
Other, net (1,054) (11) (228)
Total $ (30,532) $ (40,276) $ (45,409)