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Share-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | May 29, 2018
Stock-based compensation expense [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 42.6 | $ 23.6 | $ 87.9 | $ 46.0 |
Income tax benefit | 9.0 | 7.8 | 19.1 | 15.3 |
Net income effect of share-based compensation | 33.6 | 15.8 | 68.8 | 30.7 |
Share-based compensation expense previously capitalized | 3.9 |  | 7.5 |  |
Inventory |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Income tax benefit | 4.4 | 3.1 | 7.9 | 5.8 |
Share-based compensation expense previously capitalized |  | 3.7 |  | 7.1 |
Cost of sales |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Allocated share-based compensation expense | 3.9 | 3.7 | 7.5 | 7.1 |
Research and development |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Allocated share-based compensation expense | 19.7 | 10.6 | 33.8 | 20.9 |
Selling, general and administrative |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Allocated share-based compensation expense | 17.8 | 9.3 | 29.5 | 18.0 |
Special charges and other, net |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Allocated share-based compensation expense | 1.2 | 0.0 | 17.1 | 0.0 |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 4.0 | $ 8.2 | 9.0 | $ 14.1 |
Restricted Stock Units (RSUs) | Microsemi Corporation |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Allocated share-based compensation expense |  |  | 40.2 |  |
Consideration transferred, equity interests issued |  |  | 175.4 |  |
Compensation cost |  |  | 53.9 |  |
Compensation cost not yet recognized |  |  |  |  | $ 121.5
Accelerated compensation cost |  |  | 17.1 |  |
Restricted Stock Units (RSUs) | Microsemi Corporation | Inventory |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Income tax benefit |  |  | $ 1.6 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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