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Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) segment day | Mar. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |
Deferred revenue on shipments to distributors | $ 479.6 | $ 418.0
Deferred cost of sales on shipments to distributors | 145.8 | 125.2
Deferred income on shipments to distributors | $ 333.8 | 292.8
Property, Plant and Equipment [Line Items] |  |
Effective income tax rate | 31.50% |
Amount of distributor advances, included in deferred income on shipments to distributors in consolidated balance sheets | $ 203.9 | $ 203.9
Number of reporting units | 2 |
Number of days requiring distributor to settle receivable balances (in days) | day | 30 |
Number of operating segments | segment | 2 |
Minimum |  |
Property, Plant and Equipment [Line Items] |  |
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] |  |
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 |

X
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