Significant Customers and Concentrations of Credit Risk (Details) (USD $)	3 Months Ended	6 Months Ended
Oct. 01, 2011 Employee Customer	Oct. 02, 2010 Customer	Oct. 01, 2011 Customer	Oct. 02, 2010 Customer	Apr. 02, 2011	Mar. 28, 2009
Significant Customers and Concentrations of Credit Risk (Textuals) [Abstract]
Percentage of total accounts receivable accounted from Avnet	84.00%		84.00%		79.00%
Percentage of net revenues through resale of product from Avnet	47.00%	53.00%	48.00%	52.00%
Percentage of net revenues from end customer	14.00%	11.00%	11.00%	10.00%
Number of end customers accounted for net revenues	1	1	1	1
Percentage of higher grade securities investment in debt securities			92.00%
Total investment portfolio	$ 2,790,000,000		$ 2,790,000,000
Percentage of student loan auction rate securities in total investment portfolio	1.00%		1.00%
Investments downgraded to an A rate securities						$ 3,400,000
Percentage of mortgage-backed securities in total investment portfolio	28.00%		28.00%

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 12

-Paragraph 3, 4

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph 2, 3

-Article 12

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 5

-Subparagraph (SX 210.12-13.Column C.6)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph Column C

-Article 12

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-12.Column C.3,4)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph 6

-Article 12

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14.Column E.2,3)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph Column C

-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column E

-Article 12

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph 7

-Article 12

Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

-Subparagraph (SX 210.12-12C.Column C.7)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010

Reference 12: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph Column C

-Article 12

+ Details

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

- Definition

Investments downgraded to an A rate Securities.

+ Details

Name:	xlnx_InvestmentsDowngradedToRateSecurities
Namespace Prefix:	xlnx
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Net revenue percentage for significant customer.

+ Details

Name:	xlnx_NetRevenuePercentageForSignificantCustomer
Namespace Prefix:	xlnx
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ Details

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

- Definition

Percentage of accounts receivable accounted from distributor.

+ Details

Name:	xlnx_PercentageOfAccountsReceivableAccountedFromCompanyDistributorOne
Namespace Prefix:	xlnx
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of higher grade securities investment in debt securities.

+ Details

Name:	xlnx_PercentageOfHigherGradeSecuritiesInvestmentInDebtSecurities
Namespace Prefix:	xlnx
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of mortgage backed securities in investment portfolio.

+ Details

Name:	xlnx_PercentageOfMortgageBackedSecuritiesInInvestmentPortfolio
Namespace Prefix:	xlnx
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Net revenue threshold for significant customer.

+ Details

Name:	xlnx_PercentageOfNetRevenuesThroughResaleOfProductFromCompanyDistributorOne
Namespace Prefix:	xlnx
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of student loan auction rate securities in investment portfolio.

+ Details

Name:	xlnx_PercentageOfStudentLoanAuctionRateSecuritiesInInvestmentPortfolio
Namespace Prefix:	xlnx
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Significant customers and concentrations of credit risk.

+ Details

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