Summary of Significant Accounting Policies and Concentrations of Risk (Other) (Details)	12 Months Ended
Mar. 28, 2020 USD ($) Customer	Mar. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)
Summary of Significant Accounting Policies and Concentrations of Risk [Abstract]
Debt Securities, Held-to-maturity	$ 0	$ 0
Impairment of goodwill	$ 0
Percentage of net revenues from products sold to distributors	53.00%
Number Of End Customers Accounted For Net Revenues \| Customer	0
Excess benefits from stock-based compensation	$ 37,428,000	$ 14,196,000	$ 21,520,000

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266

+ Details

Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Effective Income Tax Rate Reconciliation, Excess Tax Benefits, Share-based Compensation, Amount

+ References

No definition available.

+ Details

Name:	xlnx_EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsSharebasedCompensationAmount
Namespace Prefix:	xlnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of end customers accounted for more than 10% of net revenues.

+ References

No definition available.

+ Details

Name:	xlnx_NumberOfEndCustomersAccountedForNetRevenues
Namespace Prefix:	xlnx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of net revenues from products sold to distributors.

+ References

No definition available.

+ Details

Name:	xlnx_PercentageOfNetRevenuesFromProductsSoldToDistributors
Namespace Prefix:	xlnx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Summary of significant accounting policies and concentrations of risk.

+ References

No definition available.

+ Details

Name:	xlnx_SummaryOfSignificantAccountingPoliciesAndConcentrationsOfRiskAbstract
Namespace Prefix:	xlnx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration