Condensed Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net revenue:
Product	$ 454	$ 420	$ 1,282	$ 1,104
Service and other	505	478	1,126	1,065
Total net revenue	959	898	2,408	2,169
Cost of revenue:
Product	300	317	364	407
Service and other	89	84	179	173
Total cost of revenue	389	401	543	580
Gross profit	570	497	1,865	1,589
Operating expenses:
Research and development	331	291	656	585
Marketing and sales	160	143	281	271
General and administrative	118	111	223	219
Amortization of intangibles	2	1	3	3
Total operating expenses	611	546	1,163	1,078
Operating income (loss)	(41)	(49)	702	511
Interest and other income (expense), net	3	(3)	9	(11)
Income (loss) before provision for (benefit from) income taxes	(38)	(52)	711	500
Provision for (benefit from) income taxes	(16)	(14)	89	98
Net income (loss)	$ (22)	$ (38)	$ 622	$ 402
Earnings (loss) per share:
Basic	$ (0.07)	$ (0.13)	$ 2.01	$ 1.34
Diluted	$ (0.07)	$ (0.13)	$ 1.99	$ 1.28
Number of shares used in computation:
Basic	309	301	309	301
Diluted	309	301	313	315