Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net revenues:
Product	$ 3,478,264	$ 3,258,651	$ 2,567,992
Service	970,445	834,615	747,920
Total net revenues	4,448,709	4,093,266	3,315,912
Cost of revenues:
Product	1,155,283	1,000,865	841,722
Service	424,836	350,654	290,987
Total cost of revenues	1,580,119	1,351,519	1,132,709
Gross margin	2,868,590	2,741,747	2,183,203
Operating expenses:
Research and development	1,026,790	917,855	741,708
Sales and marketing	1,001,060	857,072	759,131
General and administrative	179,132	177,859	159,459
Amortization of purchased intangible assets	5,366	4,230	10,416
Litigation settlement charges	0	0	182,331
Restructuring and other charges	30,564	10,805	19,463
Acquisition-related and other charges	7,154	6,342	0
Total operating expenses	2,250,066	1,974,163	1,872,508
Operating income	618,524	767,584	310,695
Other (expense) income, net	(46,808)	10,570	1,366
Income before income taxes and noncontrolling interest	571,716	778,154	312,061
Income tax provision	146,704	158,781	196,833
Consolidated net income	425,012	619,373	115,228
Adjust for net (income) loss attributable to noncontrolling interest	124	(971)	1,771
Net income attributable to Juniper Networks	$ 425,136	$ 618,402	$ 116,999
Net income per share attributable to Juniper Networks common stockholders:
Basic	$ 0.80	$ 1.18	$ 0.22
Diluted	$ 0.79	$ 1.15	$ 0.22
Shares used in computing net income per share:
Basic	529,768	522,444	523,603
Diluted	541,417	538,790	534,015