Equity Incentive Plans (Tables)

12 Months Ended

Mar. 31, 2011

Notes to Financial Statements [Abstract]

Share-based compensation expense

The following table presents details of share-based compensation expense (amounts in thousands):

	Year Ended March 31,
	2011			2010			2009
Cost of sales (1)	$	6,825		$	7,054		$	5,845
Research and development		12,874			12,194			10,866
Selling, general and administrative		17,113			17,530			15,770
Pre-tax effect of share-based compensation		36,812			36,778			32,481
Income tax benefit		(4,493	)		(4,563	)		(5,277	)
Net income effect of share-based compensation	$	32,319		$	32,215		$	27,204

(1) During the year ended March 31, 2011, $7.1million was capitalized to inventory, and $6.8 million of capitalized inventory was sold.  During the year ended March 31, 2010, $7.0 million was capitalized to inventory and $7.1 million of capitalized inventory was sold.  During the year ended March 31, 2009, $6.7 million was capitalized to inventory and $5.8 million of capitalized inventory was sold.

Option and award activity under stock incentive plans

RSU share activity under the 2004 Plan is set forth below:

	Number of Shares
Nonvested shares at March 31, 2008		2,464,565
Granted		1,876,738
Forfeited/expired		(293,573	)
Vested		(445,958	)
Nonvested shares at March 31, 2009		3,601,772
Granted		1,846,241
Forfeited/expired		(120,198	)
Vested		(689,867	)
Nonvested shares at March 31, 2010		4,637,948
Granted		1,766,257
Forfeited/expired		(171,967	)
Vested		(990,932	)
Nonvested shares at March 31, 2011		5,241,306

The total intrinsic value of RSUs which vested during the years ended March 31, 2011, 2010 and 2009 was $32.6 million, $17.5 million and $12.4 million, respectively.  The aggregate intrinsic value of RSUs outstanding at March 31, 2011 was $199.2 million calculated based on the closing price of the Company's common stock of $38.01 on March 31, 2011.

The weighted average fair values per share of the RSUs awarded are calculated based on the fair market value of the Company's common stock on the respective grant dates discounted for the Company's expected dividend yield.  The weighted average fair values per share of RSUs awarded in the years ended March 31, 2011, 2010 and 2009 was $26.05, $20.75 and $22.11, respectively.  At March 31, 2011, the weighted average remaining expense recognition period was 2.25 years.

Option activity under the Company's stock incentive plans in the three years ended March 31, 2011 is set forth below:

	Number of Shares			Weighted Average Exercise Price per Share
Outstanding at March 31, 2008		11,732,385			23.14
Granted		24,000			33.90
Exercised		(1,573,183	)		16.33
Canceled		(101,669	)		26.27
Outstanding at March 31, 2009		10,081,533			24.20
Granted		12,000			27.03
Exercised		(1,492,866	)		22.03
Canceled		(140,888	)		27.79
Outstanding at March 31, 2010		8,459,779			24.52
Granted		---			---
Exercised		(2,885,365	)		23.09
Canceled		(77,490	)		29.39
Outstanding at March 31, 2011		5,496,924			25.21

Summary of information about stock options outstanding

The weighted average fair values per share of stock options granted in the years ended March 31, 2010, and 2009 was $5.90 and $10.39, respectively.  There were no stock options granted in the year ended March 31, 2011.  The fair values per share of stock options granted were estimated utilizing the following assumptions:

	Year Ended March 31,
	2010			2009
Expected term (in years)		6.50			6.50
Volatility		36	%		43	%
Risk-free interest rate		2.57	%		3.14	%
Dividend yield		5.00	%		4.00	%