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
	Mar. 31, 2012	Mar. 31, 2011
Net Income Per Share Attributable To Citrix Systems, Inc. Stockholders
Net income attributable to Citrix Systems, Inc. stockholders	$ 68,267	$ 73,503
Denominator for basic earnings per share - weighted-average shares outstanding	185,730	187,571
Effect of dilutive employee stock awards	3,154	3,929
Denominator for diluted earnings per share - weighted-average shares outstanding	188,884	191,500
Net income per share attributable to Citrix Systems, Inc. stockholders- basic	$ 0.37	$ 0.39
Net income per share attributable to Citrix Systems, Inc. stockholders- diluted	$ 0.36	$ 0.38
Anti-dilutive weighted-average shares	3,805	857