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Equity Incentive Plans (Tables)
 12 Months Ended
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
%