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Equity Incentive Plans (Tables) | 12 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation Expense | The following table presents the details of the Company's share-based compensation expense (amounts in millions):
| Year Ended March 31,
| 2018 |  | 2017 |  | 2016 |
Cost of sales | $ | 13.8 |  | (1) | $ | 18.7 |  | (1) | $ | 8.3 |  | (1)
Research and development | 42.5 |  |  | 46.8 |  |  | 32.0 |  |
Selling, general and administrative | 36.9 |  |  | 62.6 |  |  | 31.1 |  |
Pre-tax effect of share-based compensation | 93.2 |  |  | 128.1 |  |  | 71.4 |  |
Income tax benefit | 28.3 |  | (2) | 44.2 |  | (2) | 23.0 |  |
Net income effect of share-based compensation | $ | 64.9 |  |  | $ | 83.9 |  |  | $ | 48.4 |  |
(1) During the year ended March 31, 2018, $11.9 million of share-based compensation expense was capitalized to inventory, and $13.8 million of previously capitalized share-based compensation expense in inventory was sold. During the year ended March 31, 2017, $11.3 million of share-based compensation expense was capitalized to inventory. The amount of share-based compensation included in cost of sales during fiscal 2017 included $14.5 million of previously capitalized share-based compensation expense in inventory that was sold and $4.2 million of share-based compensation expense related to the Company's acquisition of Atmel that was not previously capitalized to inventory. During the year ended March 31, 2016, $7.9 million of share-based compensation expense was capitalized to inventory, and $8.3 million of previously capitalized share-based compensation expense in inventory was sold. (2) Amounts exclude excess tax benefits related to share-based compensation of $28.1 million and $25.0 million for the years ended March 31, 2018 and March 31, 2017, respectively. The Company elected to early adopt ASU 2016-09 effective April 1, 2016. Prior to the adoption of ASU 2016-09, the Company recognized excess tax benefits related to share-based compensation in additional paid-in capital. Refer to Note 1 for additional information on the adoption of this standard.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | RSU share activity under the 2004 Plan is set forth below:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested shares at March 31, 2015 | 5,268,916 |  |  | $ | 34.15 |
Granted | 2,479,729 |  |  | 38.91 |
Assumed upon acquisition | 525,442 |  |  | 40.58 |
Forfeited | (360,072 | ) |  | 38.20 |
Vested | (1,606,273 | ) |  | 32.47 |
Nonvested shares at March 31, 2016 | 6,307,742 |  |  | 36.76 |
Granted | 1,635,655 |  |  | 51.46 |
Assumed upon acquisition | 2,059,524 |  |  | 46.57 |
Forfeited | (722,212 | ) |  | 43.58 |
Vested | (2,861,253 | ) |  | 38.60 |
Nonvested shares at March 31, 2017 | 6,419,456 |  |  | 42.06 |
Granted | 1,267,536 |  |  | 77.26 |
Forfeited | (279,051 | ) |  | 49.65 |
Vested | (1,735,501 | ) |  | 38.00 |
Nonvested shares at March 31, 2018 | 5,672,440 |  |  | $ | 50.79 |
Schedule of Share-based Compensation, Stock Options, Activity | Stock option and stock appreciation right (SAR) activity under the Company's stock incentive plans in the three years ended March 31, 2018 is set forth below:
| Number of Shares |  | Weighted Average Exercise Price per Share
Outstanding at March 31, 2015 | 684,299 |  |  | $ | 28.41 |
Granted | 244 |  |  | 41.09 |
Assumed upon acquisition | 604,900 |  |  | 35.03 |
Exercised | (221,987 | ) |  | 25.30 |
Forfeited or expired | (153,948 | ) |  | 31.52 |
Outstanding at March 31, 2016 | 913,508 |  |  | 33.00 |
Exercised | (437,906 | ) |  | 34.34 |
Forfeited or expired | (42,485 | ) |  | 34.26 |
Outstanding at March 31, 2017 | 433,117 |  |  | 31.51 |
Exercised | (131,666 | ) |  | 31.75 |
Forfeited or expired | (17,111 | ) |  | 34.73 |
Outstanding at March 31, 2018 | 284,340 |  |  | $ | 31.21 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted average fair values per share of stock options granted in the year ended March 31, 2016 was $8.85. The fair values per share of stock options granted in the year ended March 31, 2016 were estimated utilizing the following assumptions:
| Year Ended March 31,
| 2016
Expected term (in years) | 6.5 |
Volatility | 29.50 | %
Risk-free interest rate | 1.54 | %
Dividend yield | 3.00 | %

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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