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Business Acquisitions (Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 04, 2016 | Aug. 03, 2015
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 2,299.0 | $ 2,299.0 |  |
Atmel Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  | $ 230.2 |
Accounts receivable, net |  |  | 141.4 |
Inventories |  |  | 335.1 |
Prepaid expenses and other current assets |  |  | 28.4 |
Assets held for sale |  |  | 32.0 |
Property, plant and equipment, net |  |  | 129.9 |
Goodwill |  |  | 1,286.4 |
Purchased intangible assets |  |  | 1,888.4 |
Long-term deferred tax assets |  |  | 46.7 |
Other assets |  |  | 7.5 |
Total assets acquired |  |  | 4,126.0 |
Accounts payable |  |  | (55.7) |
Other current liabilities |  |  | (121.0) |
Long-term line of credit |  |  | (192.0) |
Long-term income tax payable |  |  | (115.1) |
Deferred tax liabilities |  |  | (27.5) |
Other long-term liabilities |  |  | (141.7) |
Total liabilities assumed |  |  | (653.0) |
Purchase price allocated |  |  | $ 3,473.0 |
Micrel Incorporated |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | $ 99.1
Accounts receivable, net |  |  |  | 14.0
Inventories |  |  |  | 73.5
Prepaid expenses and other current assets |  |  |  | 10.7
Property, plant and equipment, net |  |  |  | 38.5
Goodwill |  |  |  | 441.0
Purchased intangible assets |  |  |  | 273.5
Long-term deferred tax assets |  |  |  | 11.4
Other assets |  |  |  | 4.3
Total assets acquired |  |  |  | 954.6
Accounts payable |  |  |  | (11.1)
Other current liabilities |  |  |  | (31.6)
Long-term income tax payable |  |  |  | (7.6)
Deferred tax liabilities |  |  |  | (88.0)
Other long-term liabilities |  |  |  | (0.1)
Total liabilities assumed |  |  |  | (138.4)
Purchase price allocated |  |  |  | $ 816.2

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