Equity Incentive Plans (Tables)

12 Months Ended

Mar. 31, 2014

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,
	2014			2013			2012
Cost of sales	$	7,340	(1)	$	8,234	(1)	$	5,648	(1)
Research and development	24,554			22,178			14,719
Selling, general and administrative	21,893			27,603			17,922
Pre-tax effect of share-based compensation	53,787			58,015			38,289
Income tax benefit	5,722			9,038			4,889
Net income effect of share-based compensation	$	48,065		$	48,977		$	33,400

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, 2011	5,241,306
Granted	1,627,191
Forfeited/expired	(184,926	)
Vested	(1,191,351	)
Nonvested shares at March 31, 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

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, 2014 is set forth below:

	Number of Shares		Weighted Average Exercise Price per Share
Outstanding at April 1, 2011	5,496,924		$	25.21
Granted	—		—
Exercised	(2,129,260	)	25.53
Canceled	(6,667	)	25.05
Outstanding at March 31, 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