Significant Customers and Concentrations of Credit Risk (Notes)	9 Months Ended
Dec. 30, 2017
Significant Customers and Concentrations of Credit Risk [Abstract]
Concentration Risk Disclosure [Text Block]	Significant Customers and Concentrations of Credit Risk Avnet, Inc. (Avnet), one of the Company’s distributors, distributes the Company’s products worldwide. As of December 30, 2017 and April 1, 2017, Avnet accounted for 64% and 59% of the Company’s total net accounts receivable, respectively. For the third quarter and first nine months of fiscal year 2018, resale of product through Avnet accounted for 42% and 45% of the Company’s worldwide net revenues, respectively. For the third quarter and the first nine months of fiscal year 2017, resale of product through Avnet accounted for 42% and 43% of the Company’s worldwide net revenues, respectively. Xilinx is subject to concentrations of credit risk primarily in its trade accounts receivable and investments in debt securities to the extent of the amounts recorded on the consolidated balance sheet. The Company attempts to mitigate the concentration of credit risk in its trade receivables through its credit evaluation process, collection terms, distributor sales to diverse end customers and through geographical dispersion of sales. Xilinx generally does not require collateral for receivables from its end customers or from distributors. No end customer accounted for more than 10% of the Company’s worldwide net revenues for the third quarter as well as the first nine months of fiscal years 2018 and 2017. The Company mitigates concentrations of credit risk in its investments in debt securities by currently investing approximately 85% of its portfolio in AA (or its equivalent) or higher grade securities as rated by Standard & Poor’s or Moody’s Investors Service. The Company’s methods to arrive at investment decisions are not solely based on the rating agencies’ credit ratings. Xilinx also performs additional credit due diligence and conducts regular portfolio credit reviews, including a review of counterparty credit risk related to the Company’s forward currency exchange and interest rate swap contracts. Additionally, Xilinx limits its investments in the debt securities of a single issuer based upon the issuer’s credit rating and attempts to further mitigate credit risk by diversifying risk across geographies and type of issuer. As of December 30, 2017, approximately 33% of the portfolio consisted of mortgage-backed securities. All of the mortgage-backed securities in the investment portfolio were issued by U.S. government-sponsored enterprises and agencies and are rated AA+ by Standard & Poor’s and Aaa by Moody’s Investors Service.

Significant Customers and Concentrations of Credit Risk

Avnet, Inc. (Avnet), one of the Company’s distributors, distributes the Company’s products worldwide. As of December 30, 2017 and April 1, 2017, Avnet accounted for 64% and 59% of the Company’s total net accounts receivable, respectively. For the third quarter and first nine months of fiscal year 2018, resale of product through Avnet accounted for 42% and 45% of the Company’s worldwide net revenues, respectively. For the third quarter and the first nine months of fiscal year 2017, resale of product through Avnet accounted for 42% and 43% of the Company’s worldwide net revenues, respectively.

Xilinx is subject to concentrations of credit risk primarily in its trade accounts receivable and investments in debt securities to the extent of the amounts recorded on the consolidated balance sheet. The Company attempts to mitigate the concentration of credit risk in its trade receivables through its credit evaluation process, collection terms, distributor sales to diverse end customers and through geographical dispersion of sales. Xilinx generally does not require collateral for receivables from its end customers or from distributors.

No end customer accounted for more than 10% of the Company’s worldwide net revenues for the third quarter as well as the first nine months of fiscal years 2018 and 2017.

The Company mitigates concentrations of credit risk in its investments in debt securities by currently investing approximately 85% of its portfolio in AA (or its equivalent) or higher grade securities as rated by Standard & Poor’s or Moody’s Investors Service. The Company’s methods to arrive at investment decisions are not solely based on the rating agencies’ credit ratings. Xilinx also performs additional credit due diligence and conducts regular portfolio credit reviews, including a review of counterparty credit risk related to the Company’s forward currency exchange and interest rate swap contracts. Additionally, Xilinx limits its investments in the debt securities of a single issuer based upon the issuer’s credit rating and attempts to further mitigate credit risk by diversifying risk across geographies and type of issuer.

As of December 30, 2017, approximately 33% of the portfolio consisted of mortgage-backed securities. All of the mortgage-backed securities in the investment portfolio were issued by U.S. government-sponsored enterprises and agencies and are rated AA+ by Standard & Poor’s and Aaa by Moody’s Investors Service.