Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Mar. 30, 2013		Dec. 29, 2012		Sep. 29, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Oct. 01, 2011		Jul. 02, 2011		Mar. 30, 2013	Mar. 31, 2012	Apr. 02, 2011
Income Tax Disclosure [Abstract]
Domestic																	$ 45,617	$ 74,959	$ 161,784
Foreign																	501,389	522,092	609,296
Income before income taxes	$ 138,325	[1]	$ 115,693	[1]	$ 138,083	[1]	$ 154,905	[1]	$ 140,388	[2],[3]	$ 129,938	[2],[3]	$ 146,241	[2],[3]	$ 180,484	[2],[3]	$ 547,006	$ 597,051	$ 771,080

[1] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2013 was a 52-week year and each quarter was a 13-week quarter.

[2] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2012 was a 52-week year and each quarter was a 13-week quarter.

[3] Income before income taxes for the second quarter and fourth quarter of fiscal 2012 include restructuring and litigation charges of $3,369 and $15,400, respectively.