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Business Acquisitions (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 04, 2016 | Aug. 03, 2015 | Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Non-cash consideration, exchange of employee stock awards (amount) |  |  | $ 7.5 | $ 4.1
Atmel Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid for shares | $ 2,980.0 |  |  |
Shares issued in acquisition | 10.1 |  |  |
Equity interest issued or issuable, value assigned | $ 486.1 |  |  |
Separately recognized transactions, expenses and losses recognized | 14.9 |  |  |
Consideration transferred, share based payment awards | 7.5 |  |  |
Total consideration transferred | 3,470.0 |  |  |
Recognized identifiable assets acquired and liabilities assumed, liabilities | 653.0 |  |  |
Payments to acquire businesses portion funded by foreign subsidiaries cash balances | 2,040.0 |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | $ 940.0 |  |  |
Useful life (in years) | 9 years |  |  |
Net deferred tax liability for future amortization expense of acquired intangible assets | $ 178.1 |  |  |
Long-term deferred tax assets | $ 46.7 |  |  |
Micrel Incorporated |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid for shares |  | $ 430.0 |  |
Shares issued in acquisition |  | 8.6 |  |
Non-cash consideration, exchange of employee stock awards (amount) |  | $ 4.1 |  |
Total consideration transferred |  | 816.2 |  |
Recognized identifiable assets acquired and liabilities assumed, liabilities |  | 138.4 |  |
Net deferred tax liability for future amortization expense of acquired intangible assets |  | 99.7 |  |
Cash paid in a business combination for employee vested stock awards |  | 13.1 |  |
Long-term deferred tax assets |  | $ 11.4 |  |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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