Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Mar. 28, 2015		Dec. 27, 2014		Sep. 27, 2014		Jun. 28, 2014		Mar. 29, 2014		Dec. 28, 2013		Sep. 28, 2013		Jun. 29, 2013		Mar. 28, 2015	Mar. 29, 2014	Mar. 30, 2013
Income Tax Disclosure [Abstract]
Income before provision for taxes	$ 159,478	[1],[2]	$ 186,002	[1],[2]	$ 194,318	[1],[2]	$ 200,278	[1],[2]	$ 175,850	[3],[4]	$ 197,932	[3],[4]	$ 152,765	[3],[4]	$ 182,979	[3],[4]	$ 740,076	$ 709,526	$ 547,006
Federal statutory tax rate																	35.00%	35.00%	35.00%
Computed expected tax																	259,027	248,334	191,452
State taxes, net of federal benefit																	2,458	4,664	1,787
Foreign earnings at lower tax rates																	(141,372)	(143,336)	(107,730)
Tax credits																	(26,633)	(23,389)	(26,305)
Other																	(1,620)	(7,135)	266
Total																	$ 91,860	$ 79,138	$ 59,470

[1] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2015 was a 52-week year and each quarter was a 13-week quarter.

[2] Income before income taxes for the fourth quarter of fiscal 2015 included restructuring charges of $24,491.

[3] Income before income taxes for the second quarter of fiscal 2014 included litigation and contingencies charge of $28,600, for the third quarter of fiscal 2014 included reversal of litigation and contingencies charge of $19,190 and for the fourth quarter of fiscal 2014 included loss on extinguishment of convertible debentures of $9,848.

[4] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2014 was a 52-week year and each quarter was a 13-week quarter.