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Business Acquisitions (Schedule of Purchased Intangible Assets) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 04, 2016 | Aug. 03, 2015 | Mar. 31, 2018
Core/developed technology |  |  |
Business Acquisition [Line Items] |  |  |
Purchased intangible assets |  |  | $ 7.1
Atmel Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) | 9 years |  |
Purchased intangible assets | $ 1,888.4 |  |
Atmel Corporation | Core/developed technology |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) | 11 years |  |
Purchased intangible assets | $ 1,075.0 |  |
Atmel Corporation | Customer-related |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) | 6 years |  |
Purchased intangible assets | $ 630.6 |  |
Atmel Corporation | Backlog |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) | 1 year |  |
Purchased intangible assets | $ 40.3 |  |
Atmel Corporation | Other intangible assets |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) | 5 years |  |
Purchased intangible assets | $ 1.8 |  |
Micrel Incorporated |  |  |
Business Acquisition [Line Items] |  |  |
Purchased intangible assets |  | $ 273.5 |
Micrel Incorporated | Core/developed technology |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) |  | 10 years |
Purchased intangible assets |  | $ 175.8 |
Micrel Incorporated | In-process technology |  |  |
Business Acquisition [Line Items] |  |  |
Purchased intangible assets |  | $ 21.0 |
Micrel Incorporated | Customer-related |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) |  | 5 years |
Purchased intangible assets |  | $ 71.1 |
Micrel Incorporated | Backlog |  |  |
Business Acquisition [Line Items] |  |  |
Useful life (in years) |  | 1 year |
Purchased intangible assets |  | $ 5.6 |
In-process technology | Atmel Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite-lived Intangible Assets Acquired | $ 140.7 |  |

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