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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Net operating loss and tax credit carryforwards |  |  |  |  |
Decrease in uncertain tax positions |  | $ 25,075 | $ 3,863 | $ 3,586 |
Amortization period | 10 years |  | 10 years |  |
Expense (benefit) related to reversal of uncertain tax positions |  |  | $ 25,100 |  |
Recognition of excess tax benefits |  |  | 18,700 |  |
Expense (benefit) due to remeasurement of deferred tax assets |  |  | 5,100 |  |
Valuation allowance |  | 36,537 | 35,536 |  |
Cumulative amount of unremitted earnings of non-Swiss subsidiaries |  | 546,900 |  |  |
Deferred income tax liability |  | 18,400 |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 152,000 | 192,700 |  |
Unrecognized tax benefits, uncertain tax positions |  | 151,984 | 210,215 | $ 191,000 | $ 179,372
Interest and penalties in income tax expense |  | (600) | 1,700 |  |
Accrued interest and penalties related to uncertain tax positions |  | 7,200 | 7,800 |  |
Unrecognized tax benefits, uncertain tax positions |  | 32,314 |  |  |
Non-current income tax payable |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Unrecognized tax benefits, uncertain tax positions |  | 88,500 | $ 112,600 |  |
Swiss Federal Tax Administration (FTA) |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Foreign net operating loss carryforwards |  | 36,700 |  |  |
Unrecognized tax benefits, uncertain tax positions |  | $ 31,800 |  |  |
Minimum |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Effective income tax rates (as a percent) |  |  | 13.61% |  |
Maximum |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Effective income tax rates (as a percent) |  | 14.28% |  |  |
Swiss |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Statutory income tax rate (as a percent) |  | 8.50% | 8.50% | 8.50% |
Decrease in uncertain tax positions |  | $ 53,300 |  |  |
Increase in unrecognized tax benefits |  | 10,000 |  |  |
Amortization period |  |  | 10 years |  |
Expense (benefit) related to reversal of uncertain tax positions |  |  | $ 50,100 |  |
State and Local Jurisdiction | California Franchise Tax Board |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Valuation allowance |  | 36,400 | $ 35,300 |  |
Foreign |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Foreign net operating loss carryforwards |  | 2,300 |  |  |
Foreign tax credit carryforwards |  | $ 76,000 |  |  |

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