Stock-Based Compensation (Tables)

9 Months Ended

Dec. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule Of Assumptions Used In The Black-Scholes Valuation Model

	Stock Option Grants								ESPP
	Three Months Ended December 31,				Nine Months Ended December 31,				Nine Months Ended December 31,
	2011		2010		2011		2010		2011		2010
Risk-free interest rate	0.4- 1.2	%	1.2- 2.6	%	0.4- 1.8	%	0.8- 2.6	%	0.1	%	0.2- 0.3	%
Expected volatility	42- 46	%	41- 43	%	40- 46	%	41- 45	%	39- 40	%	38	%
Weighted-average volatility	45	%	42	%	43	%	43	%	39	%	38	%
Expected term	4.1 years		4.2 years		4.4 years		4.4 years		6-12 months		6-12 months
Expected dividends	None		None		None		None		None		None

Schedule Of Assumptions Used In Monte-Carlo Simulation Model

	Nine Months Ended December 31, 2011
Risk-free interest rate	0.2- 0.6	%
Expected volatility	14- 83	%
Weighted-average volatility	35	%
Expected dividends	None

Schedule Of Stock-Based Compensation Expense By Statement Of Operations

	Three Months Ended December 31,				Nine Months Ended December 31,
	2011		2010		2011		2010
Cost of goods sold	$	-	$	1	$	1	$	2
Marketing and sales		7		6		18		16
General and administrative		11		9		29		32
Research and development		30		30		81		86
Restructuring and other charges		-		2		-		2
Stock-based compensation expense	$	48	$	48	$	129	$	138

Employee Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Disclosure Of Stock-Based Compensation Arrangements By Stock-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	431			20.79
Exercised	(1,145	)		19.61
Forfeited, cancelled or expired	(2,151	)		23.90
Outstanding as of December 31, 2011	10,034			33.90	5.15	$	10
Exercisable as of December 31, 2011	8,440			35.43	4.69	$	9

Restricted stock rights

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

	Restricted Stock Rights (in thousands)		Weighted- Average Grant Date Fair Value
Balance as of March 31, 2011	13,971		$	22.01
Granted	9,433			22.17
Vested	(5,123	)		20.33
Forfeited or cancelled	(1,564	)		20.22
Balance as of December 31, 2011	16,717			22.78

Performance Based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

	Performance- Based Restricted Stock Units (in thousands)		Weighted- Average Grant Date Fair Value
Balance as of March 31, 2011	1,993		$	47.00
Forfeited or cancelled	(423	)		34.80
Balance as of December 31, 2011	1,570			50.29

Market-Based Restricted Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

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