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Equity Incentive Plans (Tables)
 12 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation expense
The following table presents the details of the Company's share-based compensation expense (amounts in thousands):
 
Year Ended March 31,
 
2015
 
2014
 
2013
 
Cost of sales
$
9,010

(1) 
$
7,340

(1) 
$
8,234

(1) 
Research and development
28,164

 
24,554

 
22,178

 
Selling, general and administrative
21,422

 
21,893

 
27,603

 
Pre-tax effect of share-based compensation
58,596

 
53,787

 
58,015

 
Income tax benefit
10,640

 
5,722

 
9,038

 
Net income effect of share-based compensation
$
47,956

 
$
48,065

 
$
48,977

 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
RSU share activity under the 2004 Plan is set forth below:
 
Number of Shares
Nonvested shares at April 1, 2012
5,492,220

Granted
1,976,583

Assumed upon acquisition
523,043

Forfeited/expired
(370,196
)
Vested
(1,611,819
)
Nonvested shares at March 31, 2013
6,009,831

Granted
1,616,632

Forfeited/expired
(282,964
)
Vested
(1,813,465
)
Nonvested shares at March 31, 2014
5,530,034

Granted
1,446,968

Forfeited/expired
(266,415
)
Vested
(1,441,671
)
Nonvested shares at March 31, 2015
5,268,916
Schedule of Share-based Compensation, Stock Options, Activity
Stock option and SAR activity under the Company's stock incentive plans in the three years ended March 31, 2015 is set forth below:
 
Number of
Shares
 
Weighted Average Exercise Price
per Share
Outstanding at April 1, 2012
3,360,997

 
$
25.00

Granted
—

 
—

Assumed upon acquisition
827,707

 
19.32

Exercised
(1,638,548
)
 
22.19

Canceled
(280,353
)
 
19.90

Outstanding at March 31, 2013
2,269,803

 
25.58

Granted
—

 
—

Exercised
(1,675,663
)
 
25.91

Canceled
(20,529
)
 
22.78

Outstanding at March 31, 2014
573,611

 
24.75

Granted
27,654

 
46.66

Assumed upon acquisition
666,586

 
29.33

Exercised
(477,618
)
 
26.42

Canceled
(105,934
)
 
28.17

Outstanding at March 31, 2015
684,299

 
$
28.41
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted average fair values per share of stock options granted in the year ended March 31, 2015 was $9.00. The fair values per share of stock options granted in the year ended March 31, 2015 were estimated utilizing the following assumptions:

 
Year Ended March 31,
 
2015
Expected term (in years)
6.5

Volatility
26.65
%
Risk-free interest rate
1.59
%
Dividend yield
3.00
%