Income Taxes (Details 2) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Apr. 01, 2017	[1],[2]	Dec. 31, 2016	[1],[2]	Oct. 01, 2016	[1],[2]	Jul. 02, 2016	[1],[2]	Apr. 02, 2016	[3],[4]	Jan. 02, 2016	[3],[4]	Sep. 26, 2015	[3],[4]	Jun. 27, 2015	[3],[4]	Apr. 01, 2017	Apr. 02, 2016	Mar. 28, 2015
Income Tax Disclosure [Abstract]
Income before provision for taxes	$ 171,220		$ 162,580		$ 175,662		$ 181,618		$ 169,838		$ 155,051		$ 143,969		$ 167,967		$ 691,080	$ 636,825	$ 740,076
Federal statutory tax rate																	35.00%	35.00%	35.00%
Computed expected tax																	$ 241,878	$ 222,889	$ 259,027
State taxes, net of federal benefit																	1,741	3,177	2,458
Foreign earnings at lower tax rates																	(119,616)	(112,942)	(141,372)
Tax credits																	(34,146)	(25,211)	(26,633)
Effective Income Tax Rate Reconciliation, Excess Tax Benefits, Share-based Compensation, Amount																	15,396	0	0
Other																	(5,893)	(1,955)	(1,620)
Total																	$ 68,568	$ 85,958	$ 91,860

[1] Net income per common share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per common share information may not equal the annual net income per common sha

[2] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2017 was a 52-week year and each quarter was a 13-week quarte

[3] .

[4] Xilinx uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2016 was a 53-week year and each quarter was a 13-week quarter