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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2018
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Components of Deferred Tax Assets [Abstract] |  |  |
Deferred income on shipments to distributors | $ 0.0 |  | $ 39.1
Inventory valuation | 45.0 |  | 10.7
Net operating loss carryforward | 94.3 |  | 101.1
Capital loss carryforward | 9.6 |  | 10.6
Share-based compensation | 42.4 |  | 31.4
Income tax credits | 376.5 |  | 178.4
Property, plant and equipment | 23.6 |  | 25.7
Accrued expenses and other | 91.4 |  | 91.2
Intangible assets | 1,608.1 |  | 0.0
Other | 12.6 |  | 0.0
Gross deferred tax assets | 2,303.5 |  | 488.2
Valuation allowances | (332.1) |  | (204.5)
Deferred tax assets, net of valuation allowances | 1,971.4 |  | 283.7
Components of Deferred Tax Liabilities [Abstract] |  |  |
Convertible debt | (279.3) |  | (304.4)
Intangible assets | (721.0) |  | (66.6)
Other | 0.0 |  | (18.3)
Deferred tax liabilities | (1,000.3) |  | (389.3)
Net deferred tax asset | 971.1 |  |
Net deferred tax liability |  |  | (105.6)
Non-current deferred tax assets | 1,677.2 | $ 1,656.5 | 100.2
Non-current deferred tax liability | $ (706.1) | $ (221.5) | $ (205.8)

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