Document and Entity Information (USD $)	12 Months Ended
	Mar. 28, 2015	Apr. 24, 2015	Sep. 26, 2014
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 28, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Entity Registrant Name	XILINX INC
Entity Central Index Key	0000743988
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--03-28
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		258,596,234
Common Stock, par value (in dollars per share)	$ 0.01
Entity Public Float			$ 12,220,670,000