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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Net operating loss and tax credit carryforwards |  |  |  |
Deferred income tax expense (benefit) | $ (159,853) | $ (12,257) | $ 7,141 |
Valuation allowance | 29,171 | 28,375 |  |
Cumulative amount of unremitted earnings of non-Swiss subsidiaries | 112,800 |  |  |
Deferred income tax liability | 1,000 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 140,800 | 76,500 |  |
Unrecognized tax benefits, uncertain tax positions | 143,497 | 76,549 | 69,131 | $ 63,667
Interest and penalties in income tax expense | 2,000 | 600 | $ 600 |
Accrued interest and penalties related to uncertain tax positions | 4,500 | $ 2,500 |  |
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% |
Income tax benefit from accounting policy adjustment | $ (151,700) |  |  |
Deferred income tax expense (benefit) | (153,200) |  |  |
Foreign |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Foreign net operating loss carryforwards | 295,800 |  |  |
Foreign tax credit carryforwards | 63,300 |  |  |
California Franchise Tax Board | State and Local Jurisdiction |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Valuation allowance | 27,700 | $ 25,700 |  |
Increase (decrease) in valuation allowance | 700 |  |  |
Various Tax Credit Carryforwards |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Valuation allowance | 600 |  |  |
Streamlabs | California Franchise Tax Board | State and Local Jurisdiction |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Increase (decrease) in valuation allowance | 1,300 |  |  |
Non-current income tax payable |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Unrecognized tax benefits, uncertain tax positions | 40,800 | 36,400 |  |
Other Temporary Differences From Federal Act on Tax Reform and AVS Financing | Swiss |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Deferred income tax expense (benefit) | (1,500) |  |  |
Tax Carryforward |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |
Valuation allowance | 900 | $ 1,900 |  |
Increase (decrease) in valuation allowance | $ (1,000) |  |  |

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