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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Net operating loss and tax credit carryforwards |  |  |  |  |
Income tax charge net of valuation allowance |  | $ 21,700 |  |  |
Tax expense due to remeasurment of deferred tax assets |  | 35,000 |  |  |
Valuation allowance |  | 25,148 | $ 6,626 |  |
Reduction to federal valuation allowance as result of tax act |  | 4,100 |  |  |
Cumulative amount of unremitted earnings of non-Swiss subsidiaries |  | 90,400 |  |  |
Deferred income tax liability |  | 600 |  |  |
Unrecognized tax benefits, uncertain tax positions |  | 69,131 | 63,667 | $ 69,879 | $ 79,023
Payment of tax settlement to tax authority in foreign jurisdiction | $ 1,900 |  |  |  |
Interest and penalties in income tax expense |  | 600 | 700 | 300 |
Accrued interest and penalties related to uncertain tax positions |  | 2,300 | $ 3,000 | $ 3,600 |
Possible decreases in balances related to lapse of statutes of limitations |  | $ 21,900 |  |  |
Swiss |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Statutory income tax rate (as a percent) |  | 8.50% | 8.50% | 8.50% |
United States |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Statutory income tax rate (as a percent) |  | 31.60% |  |  |
Foreign |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Foreign net operating loss carryforwards |  | $ 217,100 |  |  |
Foreign tax credit carryforwards |  | 50,500 |  |  |
Non-current income tax payable |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Unrecognized tax benefits, uncertain tax positions |  | 35,000 | $ 51,800 |  |
Current income tax payable |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Unrecognized tax benefits, uncertain tax positions |  |  | 1,500 |  |
California Franchise Tax Board | State and Local Jurisdiction |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Valuation allowance |  | 22,100 | $ 5,900 |  |
Increase (decrease) in valuation allowance for foreign tax credit carryforwards |  | 3,500 |  |  |
Various Tax Credit Carryforwards |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Valuation allowance |  | 700 |  |  |
Accounting Standards Update 2016-09 |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Increase (decrease) in valuation allowance for foreign tax credit carryforwards |  | 18,000 |  |  |
Accounting Standards Update 2016-09 | Foreign |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Increase (decrease) in valuation allowance for foreign tax credit carryforwards |  | 6,400 |  |  |
Accounting Standards Update 2016-09 | California Franchise Tax Board | State and Local Jurisdiction |  |  |  |  |
Net operating loss and tax credit carryforwards |  |  |  |  |
Increase (decrease) in valuation allowance for foreign tax credit carryforwards |  | $ 11,600 |  |  |

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