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Equity Incentive Plans, Stock Compensation Expense (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 04, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Stock-based compensation expense [Line Items] |  |  |  |
Share based compensation expense |  | $ 93.2 | $ 128.1 | $ 71.4
Income tax benefit |  | 28.3 | 44.2 | 23.0
Net income effect of share-based compensation |  | 64.9 | 83.9 | 48.4
Share-based compensation expense previously capitalized |  | 13.8 |  | 8.3
Total compensation cost not yet recognized |  | $ 169.6 |  |
Nonvested awards, total compensation cost not yet recognized, period for recognition |  | 1 year 10 months 28 days |  |
Inventory |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |
Income tax benefit |  | $ 11.9 | 11.3 | 7.9
Share-based compensation expense previously capitalized |  |  | 14.5 |
Cost of Sales |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |
Share based compensation expense |  | 13.8 | 18.7 | 8.3
Research and Development Expense |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |
Share based compensation expense |  | 42.5 | 46.8 | 32.0
Selling General And Administrative |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |
Share based compensation expense |  | 36.9 | 62.6 | $ 31.1
Atmel Corporation |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |
Share-based compensation expense previously capitalized |  |  | 4.2 |
Total compensation cost not yet recognized | $ 88.4 |  |  |
Business combination fair value of assumed awards at acquisition date | 95.9 |  |  |
Consideration transferred, share based payment awards | $ 7.5 |  |  |
Accounting Standards Update 2016-09, Excess Tax Benefit Component | New Accounting Pronouncement, Early Adoption, Effect |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |
Share based compensation expense |  | $ 28.1 | $ 25.0 |

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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 Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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