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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Net operating loss and tax credit carryforwards |  |  |  |
Valuation allowance | $ 28,926 | $ 29,171 |  |
Cumulative amount of unremitted earnings of non-Swiss subsidiaries | 153,100 |  |  |
Deferred income tax liability | 2,100 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 160,300 | 140,800 |  |
Unrecognized tax benefits, uncertain tax positions | 163,253 | 143,497 | $ 76,549 | $ 69,131
Interest and penalties in income tax expense | 1,100 | 2,000 | $ 600 |
Accrued interest and penalties related to uncertain tax positions | 4,900 | $ 4,500 |  |
Possible decreases in balances related to lapse of statutes of limitations | $ 4,600 |  |  |
Swiss |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Statutory income tax rate (as a percent) | 8.50% | 8.50% | 8.50% |
Foreign |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Foreign net operating loss carryforwards | $ 173,100 |  |  |
Foreign tax credit carryforwards | 67,500 |  |  |
California Franchise Tax Board | State and Local Jurisdiction |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Valuation allowance | 28,500 | $ 27,700 |  |
Various Tax Credit Carryforwards |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Valuation allowance |  | 400 |  |
Non-current income tax payable |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Unrecognized tax benefits, uncertain tax positions | $ 59,200 | 40,800 |  |
Tax Carryforward |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Valuation allowance |  | $ 900 |  |

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