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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income Per Share Attributable To Parent
Net income attributable to Citrix Systems, Inc. stockholders	$ 78,245	$ 92,176	$ 238,518	$ 247,623
Denominator for basic earnings per share - weighted-average shares outstanding	186,864	186,979	186,326	187,688
Effect of dilutive employee stock awards	2,807	2,751	2,956	3,467
Denominator for diluted earnings per share - weighted-average shares outstanding	189,671	189,730	189,282	191,155
Net income per share attributable to Citrix Systems, Inc. stockholders- basic	$ 0.42	$ 0.49	$ 1.28	$ 1.32
Net income per share attributable to Citrix Systems, Inc. stockholders- diluted	$ 0.41	$ 0.49	$ 1.26	$ 1.30
Anti-dilutive weighted-average shares	3,355	3,587	3,336	2,023