Net Income Per Share Attributable To Citrix Systems, Inc. Stockholders (Net Income Per Share Basic And Diluted) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Income Per Share Attributable To Citrix Systems, Inc. Stockholders
Net income attributable to Citrix Systems, Inc. stockholders	$ 92,006	$ 81,944	$ 160,273	$ 155,447
Denominator for basic earnings per share - weighted-average shares outstanding	186,372	187,691	186,052	187,810
Effect of dilutive employee stock awards	2,907	3,721	3,030	3,826
Denominator for diluted earnings per share - weighted-average shares outstanding	189,279	191,412	189,082	191,636
Net income per share attributable to Citrix Systems, Inc. stockholders- basic	$ 0.49	$ 0.44	$ 0.86	$ 0.83
Net income per share attributable to Citrix Systems, Inc. stockholders- diluted	$ 0.49	$ 0.43	$ 0.85	$ 0.81
Anti-dilutive weighted-average shares	3,326	1,706	4,103	1,290