Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2011

Schedule Of Assumptions Used In The Black-Scholes Valuation Model

	Stock Option Grants				ESPP
	Three Months Ended		Six Months Ended		Three and Six Months Ended
	September 30,		September 30,		September 30,
	2011	2010	2011	2010	2011	2010
Risk-free interest rate	0.4- 1.2%	0.8- 1.7%	0.4- 1.8%	0.8- 2.4%	0.1%	0.2- 0.3%
Expected volatility	41- 44%	41- 45%	40- 44%	41- 45%	39- 40%	38%
Weighted-average volatility	44%	43%	43%	43%	39%	38%
Expected term	4.4years	4.4years	4.4years	4.4years	6-12 months	6-12 months
Expected dividends	None	None	None	None	None	None

Schedule Of Assumptions Used In Monte Carlo Simulation Model

	Six Months Ended
	September 30,
	2011
Risk-free interest rate	0.2- 0.6%
Expected volatility	14- 83%
Weighted-average volatility	35%
Expected dividends	None

Schedule Of Share-Based Compensation Expense By Statement Of Operations Line Item

	Three Months Ended September 30,		Six Months Ended September 30,
	2011	2010	2011	2010
Cost of goods sold	$                 -	$                 -	$             1	$             1
Marketing and sales	6	6	11	10
General and administrative	9	10	18	23
Research and development	28	27	51	56
Stock-based compensation expense	$              43	$              43	$           81	$           90

Employee Stock Option [Member]

Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

	Options (in thousands)	Weighted-Average Exercise Price	Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Outstanding as of March 31, 2011	12,899	$              31.39
Granted	399	20.70
Exercised	(874)	20.09
Forfeited, cancelled or expired	(1,039)	23.72
Outstanding as of September 30, 2011	11,385	32.59	4.95	$                    10
Exercisable as of September 30, 2011	8,671	35.84	4.11	$                      5

Restricted Stock Rights [Member]

Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

	Restricted Stock Rights	Weighted-Average Grant
	(in thousands)	Date Fair Value
Balance as of March 31, 2011	13,971	$              22.01
Granted	8,249	22.18
Vested	(2,945)	22.29
Forfeited or cancelled	(1,258)	20.07
Balance as of September 30, 2011	18,017	22.18

Performance Based Restricted Stock Units [Member]

Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

	Performance-Based Restricted Stock Units	Weighted-Average Grant
	(in thousands)	Date Fair Value
Balance as of March 31, 2011	1,993	$              47.00
Forfeited or cancelled	(215)	20.26
Balance as of September 30, 2011	1,778	50.23

Market Based Restricted Stock Units [Member]

Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award

	Market-Based Restricted Stock Units	Weighted-Average Grant
	(in thousands)	Date Fair Value
Balance as of March 31, 2011	-	$                    -
Granted	670	34.77
Forfeited or cancelled	(35)	34.77
Balance as of September 30, 2011	635	34.77