Schedule II - Valuation and Qualifying Accounts (Allowances) (Details) (USD $) In Thousands, except Per Share data, 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
Supplementary Financial Data [Abstract]
Net revenues	$ 566,900	[1]	$ 593,549	[1]	$ 604,262	[1]	$ 612,633	[1]	$ 617,823	[2]	$ 586,816	[2]	$ 598,937	[2]	$ 578,955	[2]	$ 2,377,344	$ 2,382,531	$ 2,168,652
Gross margin	396,521	[1]	413,911	[1]	434,645	[1]	423,444	[1]	417,878	[2]	406,024	[2]	416,121	[2]	399,255	[2]	1,668,521	1,639,278	1,431,446
Net income	134,623	[1]	168,466	[1]	171,516	[1]	173,611	[1]	156,027	[2]	175,877	[2]	141,461	[2]	157,023	[2]	648,216	630,388	487,536
Net income per common share:
Earnings Per Share, Basic	$ 0.52	[1],[3]	$ 0.64	[1],[3]	$ 0.64	[1],[3]	$ 0.65	[1],[3]	$ 0.58	[2],[3]	$ 0.66	[2],[3]	$ 0.53	[2],[3]	$ 0.59	[2],[3]	$ 2.44	$ 2.37	$ 1.86
Earnings Per Share, Diluted	$ 0.50	[1],[3]	$ 0.62	[1],[3]	$ 0.62	[1],[3]	$ 0.62	[1],[3]	$ 0.53	[2],[3]	$ 0.61	[2],[3]	$ 0.49	[2],[3]	$ 0.56	[2],[3]	$ 2.35	$ 2.19	$ 1.79
Shares used in per share calculations:
Weighted Average Number of Shares Outstanding, Basic	260,857	[1]	262,881	[1]	265,942	[1]	267,648	[1]	268,134	[2]	267,780	[2]	268,478	[2]	264,153	[2]	265,480	266,431	261,652
Weighted Average Number of Shares Outstanding, Diluted	269,514	[1]	273,795	[1]	275,800	[1]	281,579	[1]	294,536	[2]	288,195	[2]	290,685	[2]	280,291	[2]	276,123	287,396	272,573
Cash dividends per common share (in dollars per share)	$ 0.29	[1]	$ 0.29	[1]	$ 0.29	[1]	$ 0.29	[1]	$ 0.25	[2]	$ 0.25	[2]	$ 0.25	[2]	$ 0.25	[2]
Restructuring charges																	24,491	0	0
Litigation charges					28,600						19,190						0	9,410	0
Gains (Losses) on Extinguishment of Debt									9,848								0	9,848	0
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning of Year							3,355								3,425		3,355	3,425	3,446
Valuation Allowances And Reserves Additions																	0	2	0
Valuation Allowances and Reserves, Deductions																	2	72	21
Valuation Allowances and Reserves, End of Year	3,353								3,355								3,353	3,355	3,425
Allowance for Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Beginning of Year							43,004								26,401		43,004	26,401	18,826
Valuation Allowances And Reserves Additions																	10,623	19,771	7,575
Valuation Allowances and Reserves, Deductions																	1,075	3,168	0
Valuation Allowances and Reserves, End of Year	$ 52,552								$ 43,004								$ 52,552	$ 43,004	$ 26,401

[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] 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.

[3] 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 share.