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Significant Accounting Policies - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) segment | Mar. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) day | Mar. 31, 2019 USD ($) reporting_unit | Mar. 31, 2019 USD ($) unit | Jun. 30, 2018 USD ($) | Apr. 01, 2018 USD ($) | Mar. 31, 2018 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Deferred revenue on shipments to distributors |  |  |  |  |  |  |  |  | $ 479,600,000
Deferred cost of sales on shipments to distributors |  |  |  |  |  |  |  |  | 145,800,000
Deferred income on shipments to distributors | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  | $ 0 | 333,800,000
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Number of reporting units (in units) |  |  |  |  | 2 | 2 |  |  |
Impairment of goodwill |  |  | 0 |  |  |  |  |  |
Amount of distributor advances, included in deferred income on shipments to distributors in consolidated balance sheets | 170,700,000 | $ 170,700,000 | 170,700,000 | $ 170,700,000 | $ 170,700,000 | $ 170,700,000 |  |  | 203,900,000
Number of days requiring distributor to settle receivable balances (in days) | day |  |  |  | 30 |  |  |  |  |
Number of operating segments (in segments) | segment |  | 2 |  |  |  |  |  |  |
Long-term deferred tax liability | 706,100,000 | $ 706,100,000 | 706,100,000 | $ 706,100,000 | 706,100,000 | 706,100,000 |  | 221,500,000 | 205,800,000
Other assets | 111,800,000 | 111,800,000 | 111,800,000 | 111,800,000 | 111,800,000 | 111,800,000 |  | 47,700,000 | 71,800,000
Other long-term liabilities | 279,500,000 | 279,500,000 | 279,500,000 | 279,500,000 | 279,500,000 | 279,500,000 |  | 239,200,000 | 240,900,000
Long-term deferred tax assets | $ 1,677,200,000 | $ 1,677,200,000 | $ 1,677,200,000 | $ 1,677,200,000 | $ 1,677,200,000 | $ 1,677,200,000 |  | $ 1,656,500,000 | 100,200,000
Minimum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Upgrade period | 1 year |  |  |  |  |  |  |  |
Product warranty | 12 months |  |  |  |  |  |  |  |
Useful life (in years) | 1 year |  |  |  |  |  |  |  |
Minimum | Building and building improvements |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) | 10 years |  |  |  |  |  |  |  |
Minimum | Machinery and equipment |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) | 3 years |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Upgrade period | 3 years |  |  |  |  |  |  |  |
Product warranty | 24 months |  |  |  |  |  |  |  |
Useful life (in years) | 15 years |  |  |  |  |  |  |  |
Maximum | Building and building improvements |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) | 40 years |  |  |  |  |  |  |  |
Maximum | Machinery and equipment |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life (in years) | 7 years |  |  |  |  |  |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |
Deferred income on shipments to distributors |  |  |  |  |  |  |  |  | 0
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Long-term deferred tax liability |  |  |  |  |  |  | $ (1,100,000) |  | (1,100,000)
Other assets |  |  |  |  |  |  | (24,100,000) |  | (24,100,000)
Other long-term liabilities |  |  |  |  |  |  | (1,700,000) |  | (1,700,000)
Cumulative adjustment |  |  |  |  |  |  |  |  | 1,558,100,000
Long-term deferred tax assets |  |  |  |  |  |  | $ 1,580,000,000 |  | $ 1,579,400,000

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