Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net revenues:
Product	$ 861,935	$ 801,183	$ 2,630,803	$ 2,296,442
Service	243,861	211,224	697,149	606,883
Total net revenues	1,105,796	1,012,407	3,327,952	2,903,325
Cost of revenues:
Product	286,609	247,033	844,746	701,166
Service	107,583	87,587	313,551	252,413
Total cost of revenues	394,192	334,620	1,158,297	953,579
Gross margin	711,604	677,787	2,169,655	1,949,746
Operating expenses:
Research and development	257,096	231,151	776,325	662,913
Sales and marketing	254,933	204,704	747,859	599,382
General and administrative	44,455	43,773	133,639	132,791
Amortization of purchased intangible assets	1,263	917	4,139	3,258
Restructuring	16,813	181	15,550	8,550
Acquisition-related and other charges	18	1,525	6,804	2,066
Total operating expenses	574,578	482,251	1,684,316	1,408,960
Operating income	137,026	195,536	485,339	540,786
Other (expense) income, net	(15,957)	205	(36,107)	5,729
Income before income taxes and noncontrolling interest	121,069	195,741	449,232	546,515
Income tax provision	37,398	61,404	120,383	117,225
Consolidated net income	83,671	134,337	328,849	429,290
Adjust for net (income) loss attributable to noncontrolling interest	(8)	206	124	(1,121)
Net income attributable to Juniper Networks	$ 83,663	$ 134,543	$ 328,973	$ 428,169
Net income per share attributable to Juniper Networks common stockholders:
Basic	$ 0.16	$ 0.26	$ 0.62	$ 0.82
Diluted	$ 0.16	$ 0.25	$ 0.60	$ 0.80
Shares used in computing net income per share:
Basic	529,286	520,581	530,994	522,069
Diluted	536,583	534,880	544,086	537,158