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Share-Based Compensation - Equity Incentive Plans, Stock Compensation Expense (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
May 29, 2018 | Apr. 04, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Stock-based compensation expense [Line Items] |  |  |  |  |
Share based compensation expense |  |  | $ 166.4 | $ 93.2 | $ 128.1
Income tax benefit |  |  | 35.5 | 28.3 | 44.2
Net income effect of share-based compensation |  |  | 130.9 | 64.9 | 83.9
Share-based compensation expense not previously capitalized |  |  |  |  | 4.2
Total compensation cost not yet recognized |  |  | $ 253.4 |  |
Nonvested awards, total compensation cost not yet recognized, period for recognition |  |  | 1 year 10 months 17 days |  |
Awards assumed |  |  | $ 53.9 |  | 7.5
Cost of Sales |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Share based compensation expense |  |  | 14.9 | 13.8 | 18.7
Share-based compensation expense previously capitalized |  |  |  |  | 14.5
Research and development |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Share based compensation expense |  |  | 72.0 | 42.5 | 46.8
Selling, general and administrative |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Share based compensation expense |  |  | 62.3 | 36.9 | 62.6
Special (income) charges and other, net |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Share based compensation expense |  |  | 17.2 | 0.0 | 0.0
Inventory |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Capitalized share-based compensation expense |  |  | 17.2 | 11.9 | $ 11.3
Share-based compensation expense previously capitalized |  |  | 14.9 | $ 13.8 |
Restricted Stock Units (RSUs) |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Total compensation cost not yet recognized |  | $ 88.4 |  |  |
Compensation costs recognized |  | 7.5 |  |  |
Restricted Stock Units (RSUs) | Microsemi Corporation |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Share based compensation expense |  |  | 65.2 |  |
Total compensation cost not yet recognized | $ 121.5 |  |  |  |
Awards assumed | 175.4 |  |  |  |
Compensation costs recognized | $ 53.9 |  |  |  |
Accelerated compensation costs |  |  | 17.2 |  |
Restricted Stock Units (RSUs) | Atmel Corporation |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Awards assumed |  | $ 95.9 |  |  |
Restricted Stock Units (RSUs) | Inventory | Microsemi Corporation |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Income tax benefit |  |  | $ 3.5 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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