Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net revenues:
Product	$ 771,873	$ 877,440
Service	260,625	224,172
Total net revenues	1,032,498	1,101,612
Cost of revenues:
Product	280,629	265,746
Service	117,814	99,981
Total cost of revenues	398,443	365,727
Gross margin	634,055	735,885
Operating expenses:
Research and development	269,602	261,979
Sales and marketing	257,719	246,291
General and administrative	54,666	44,924
Amortization of purchased intangible assets	1,178	1,544
Restructuring	2,039	(347)
Acquisition-related	1,142	4,101
Total operating expenses	586,346	558,492
Operating income	47,709	177,393
Other expense, net	(24,431)	(6,462)
Income before income taxes and noncontrolling interest	23,278	170,931
Income tax provision	7,008	41,271
Consolidated net income	16,270	129,660
Adjust for net loss attributable to noncontrolling interest	0	90
Net income attributable to Juniper Networks	16,270	129,750
Net income per share attributable to Juniper Networks common stockholders:
Basic	$ 0.03	$ 0.24
Diluted	$ 0.03	$ 0.24
Shares used in computing net income per share:
Basic	527,186	530,789
Diluted	533,683	548,825
Comprehensive income	$ 33,148	$ 140,847