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INCOME TAXES: - Reconciliation of Expected Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]      
Computed expected income tax benefit $ (34,763) $ (37,665) $ (41,967)
Income Tax Expense (Benefit) Continuing Operations Income Tax Reconciliation Increase (Decrease) [Abstract]      
State income taxes, net of federal benefit (473) (5,998) (3,329)
Research and other tax credits (1,517) (3,141) (1,229)
Effect of federal rate change on deferred taxes 0 0 (24,565)
Nondeductible expenses 838 426 431
Stock-based compensation 5,025 (5,350) 4,452
Non-U.S. subsidiaries taxed at other than 35% 230 1,343 332
Adjustment to valuation allowances (2,245) 5,204 0
Net operating loss carryback taxed at other rates (7,360) 0 0
Other, net (11) (228) 152
Total $ (40,276) $ (45,409) $ (65,723)