Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net revenue:
Product	$ 350	$ 481	$ 893	$ 1,183
Service and other	345	230	751	483
Total net revenue	695	711	1,644	1,666
Cost of revenue:
Product	341	371	471	503
Service and other	72	74	136	147
Total cost of revenue	413	445	607	650
Gross profit	282	266	1,037	1,016
Operating expenses:
Research and development	283	306	561	588
Marketing and sales	164	219	311	370
General and administrative	129	100	214	188
Acquisition-related contingent consideration	(44)	0	(37)	(20)
Amortization of intangibles	4	7	8	14
Restructuring and other charges	(2)	(2)	(1)	25
Total operating expenses	534	630	1,056	1,165
Operating loss	(252)	(364)	(19)	(149)
Interest and other income (expense), net	(8)	(4)	(13)	(9)
Loss before provision for income taxes	(260)	(368)	(32)	(158)
Provision for income taxes	13	13	19	22
Net loss	$ (273)	$ (381)	$ (51)	$ (180)
Net loss per share:
Basic and Diluted	$ (0.89)	$ (1.21)	$ (0.17)	$ (0.57)
Number of shares used in computation:
Basic and Diluted	308	316	306	317