The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate carrying value of owned private equity or other securities for which a quoted market price is not readily determinable, the value of which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-BRD

-Chapter 7

-Paragraph 6-14

-IssueDate 2006-05-01

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Rule 15c3

-Number 240

-Section 3

-Paragraph i

-Article 15c3

+ Details

Name:	us-gaap_SecuritiesOwnedNotReadilyMarketable
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Balance of student loan auction rate securities measured at fair value using level 3 inputs.

+ Details

Name:	xlnx_BalanceOfStudentLoanAuctionRateSecuritiesMeasuredAtFairValueUsingLevelThreeInputs
Namespace Prefix:	xlnx
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Conversion Converted Instruments Expiration Or Due Date Day Month And Year

+ Details

Name:	xlnx_DebtConversionConvertedInstrumentsExpirationOrDueDateDayMonthAndYear
Namespace Prefix:	xlnx
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value measurements.

+ Details

Name:	xlnx_FairValueMeasurementsTextualsAbstract
Namespace Prefix:	xlnx
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Impairment loss on non-marketable equity investment.

+ Details

Name:	xlnx_ImpairmentLossOnNonMarketableEquityInvestment
Namespace Prefix:	xlnx
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Redemption of student loan auction rate securities.

+ Details

Name:	xlnx_RedemptionOfStudentLoanAuctionRateSecurities
Namespace Prefix:	xlnx
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Student Loan Auction Rate Securities Maturity Date

+ Details

Name:	xlnx_StudentLoanAuctionRateSecuritiesMaturityDate
Namespace Prefix:	xlnx
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

Fair Value Measurements (Details Textuals) (USD $)	3 Months Ended	6 Months Ended					1 Months Ended
Fair Value Measurements (Details Textuals) (USD $)	Oct. 01, 2011	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011 Maximum [Member]	Oct. 01, 2011 Minimum [Member]	Oct. 01, 2011 Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2007 3.125% Debentures [Member]	Oct. 01, 2011 3.125% Debentures [Member]	Apr. 02, 2011 3.125% Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance of student loan auction rate securities measured at fair value						$ 29,000,000
Redemption of student loan auction rate securities	950,000	5,400,000	450,000
Student loan auction rate securities maturity date				May 2046	December 2027
Debt Instrument [Line Items]
Interest rate of debentures	3.125%	3.125%					3.125%	3.125%
Convertible debentures due date							Mar. 15, 2037
Fair value of debentures								694,800,000
Principal amount of convertible debentures							1,000,000,000	689,635,000	689,635,000
Fair Value Measurements (Textuals) [Abstract]
Non-marketable equity securities	12,500,000	12,500,000
Impairment loss on non-marketable equity investment		$ 0