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Intangible Assets and Goodwill - Goodwill (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2018 USD ($) unit
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  |  | $ 2,299.0 |  |
Goodwill | $ 6,787.5 |  | 6,787.5 |  | $ 2,299.0
Amortization of intangible assets | 173.8 | $ 122.7 | 308.6 | $ 245.5 |
Impairment of intangible assets | 1.2 |  | 3.1 | 0.2 |
Number of reporting units (in units) | unit |  |  |  |  | 2
Semiconductor products |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  |  | 2,279.8 |  |
Additions due to the acquisition of Microsemi |  |  | 4,488.5 |  |
Goodwill | 6,768.3 |  | 6,768.3 |  | $ 2,279.8
Technology licensing |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill |  |  | 19.2 |  |
Additions due to the acquisition of Microsemi |  |  | 0.0 |  |
Goodwill | 19.2 |  | 19.2 |  | $ 19.2
Cost of sales |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Amortization of intangible assets | 2.1 | 3.1 | 1.9 | 3.9 |
Operating expense |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Amortization of intangible assets | $ 171.7 | $ 305.5 | $ 120.8 | $ 241.6 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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