Income Taxes (Tables)

12 Months Ended

Mar. 31, 2013

Income Tax Disclosure [Abstract]

Components Of Loss Before Income Taxes

The components of our income (loss) before provision for (benefit from) income taxes for the fiscal years ended March 31, 2013, 2012 and 2011 are as follows (in millions):

	Year Ended March 31,
	2013			2012			2011
Domestic	$	(15	)	$	(51	)	$	(189	)
Foreign	154			69			(90		)
Income (loss) before provision for (benefit from) income taxes	$	139		$	18		$	(279	)

Provision For (Benefit From) Income Taxes

Provision for (benefit from) income taxes for the fiscal years ended March 31, 2013, 2012 and 2011 consisted of (in millions):

	Current			Deferred			Total
Year Ended March 31, 2013
Federal	$	—		$	5		$	5
State	—			1			1
Foreign	39			(4		)	35
	$	39		$	2		$	41
Year Ended March 31, 2012
Federal	$	36		$	(89	)	$	(53	)
State	3			(2		)	1
Foreign	(11		)	5			(6		)
	$	28		$	(86	)	$	(58	)
Year Ended March 31, 2011
Federal	$	(23	)	$	2		$	(21	)
State	(6		)	3			(3		)
Foreign	23			(2		)	21
	$	(6	)	$	3		$	(3	)

Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate

The differences between the statutory tax expense (benefit) rate and our effective tax expense (benefit) rate, expressed as a percentage of income (loss) before provision for (benefit from) income taxes, for the fiscal years ended March 31, 2013, 2012 and 2011 were as follows:

	Year Ended March 31,
	2013		2012		2011
Statutory federal tax expense (benefit) rate	35.0	%	35.0	%	(35.0	)%
State taxes, net of federal benefit	(5.0	)%	(33.5	)%	(5.8	)%
Differences between statutory rate and foreign effective tax rate	(15.2	)%	(33.5	)%	12.3	%
Valuation allowance	35.0	%	(195.1	)%	23.7	%
Research and development credits	(8.6	)%	(39.2	)%	(2.4	)%
Non-deductible acquisition-related costs and tax expense from integration restructurings	—		16.7	%	—
Differences between book and tax on sale of strategic investments	(15.2	)%	—		(8.6	)%
Expiration of statutes of limitations	—		(266.8	)%	—
Non-deductible stock-based compensation	21.5	%	205.6	%	12.1	%
Acquisition-related contingent consideration	(16.5	)%	—		—
Other	(1.5	)%	(11.4	)%	2.6	%
Effective tax expense (benefit) rate	29.5	%	(322.2	)%	(1.1	)%

Deferred Tax Assets And Liabilities

The components of net deferred tax assets, as of March 31, 2013 and 2012 consisted of (in millions):

	As of March 31,
	2013			2012
Deferred tax assets:
Accruals, reserves and other expenses	$	179		$	182
Tax credit carryforwards	214			201
Stock-based compensation	46			49
Unrealized gain on marketable equity securities	—			14
Net operating loss & capital loss carryforwards	286			273
Total	725			719
Valuation allowance	(510		)	(487		)
Deferred tax assets, net of valuation allowance	215			232
Deferred tax liabilities:
Depreciation	(16		)	(19		)
State effect on federal taxes	(56		)	(52		)
Amortization	(34		)	(44		)
Prepaids and other liabilities	(11		)	(22		)
Total	(117		)	(137		)
Deferred tax assets, net of valuation allowance and deferred tax liabilities	$	98		$	95

Schedule Of Unrecognized Tax Benefits

A reconciliation of the beginning and ending balance of unrecognized tax benefits is summarized as follows (in millions):

Balance as of March 31, 2011	$	273
Increases in unrecognized tax benefits related to prior year tax positions	7
Decreases in unrecognized tax benefits related to prior year tax positions	(4		)
Increases in unrecognized tax benefits related to current year tax positions	58
Decreases in unrecognized tax benefits related to settlements with taxing authorities	(1		)
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(54		)
Changes in unrecognized tax benefits due to foreign currency translation	(5		)
Balance as of March 31, 2012	274
Increases in unrecognized tax benefits related to prior year tax positions	2
Decreases in unrecognized tax benefits related to prior year tax positions	(2		)
Increases in unrecognized tax benefits related to current year tax positions	30
Decreases in unrecognized tax benefits related to settlements with taxing authorities	—
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(5		)
Changes in unrecognized tax benefits due to foreign currency translation	(2		)
Balance as of March 31, 2013	$	297