Document and Entity Information - shares	6 Months Ended
	Sep. 29, 2018	Oct. 12, 2018
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 29, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Entity Registrant Name	XILINX INC
Entity Central Index Key	0000743988
Current Fiscal Year End Date	--03-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		253,043,435