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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Net operating loss and tax credit carryforwards
Income tax charge net of valuation allowance	$ 21,700
Valuation allowance	28,375	$ 25,148
Cumulative amount of unremitted earnings of non-Swiss subsidiaries	100,300
Deferred income tax liability	800
Unrecognized tax benefits, uncertain tax positions	76,549	69,131	$ 63,667	$ 69,879
Interest and penalties in income tax expense	600	600	$ 700
Accrued interest and penalties related to uncertain tax positions	2,500	$ 2,300
Possible decreases in balances related to lapse of statutes of limitations	$ 3,800
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	$ 252,600
Foreign tax credit carryforwards	58,100
California Franchise Tax Board \| State and Local Jurisdiction
Net operating loss and tax credit carryforwards
Valuation allowance	25,700	$ 22,100
Increase (decrease) in valuation allowance for foreign tax credit carryforwards	2,300
Various Tax Credit Carryforwards
Net operating loss and tax credit carryforwards
Valuation allowance	800
Blue Microphones Holding Corporation \| 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	1,300
Non-current income tax payable
Net operating loss and tax credit carryforwards
Unrecognized tax benefits, uncertain tax positions	36,400	35,000
Tax Carryforward
Net operating loss and tax credit carryforwards
Valuation allowance	1,900	$ 2,300
Increase (decrease) in valuation allowance for foreign tax credit carryforwards	$ (400)