Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Dec. 30, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 346,722	$ 469,087
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	34,416	33,917
Amortization	12,619	12,601
Stock-based compensation	105,209	90,073
Net loss (gain) on sale of available-for-sale securities	1,358	(771)
Amortization of debt discounts	2,254	9,053
Provision (benefit) for deferred income taxes	(362,969)	74,617
Other Operating Activities, Cash Flow Statement	1,500	0
Changes in assets and liabilities:
Accounts receivable, net	(108,934)	(33,395)
Inventories	367	(27,295)
Prepaid expenses and other current assets	(8,656)	(8,619)
Other assets	(27,292)	(11,160)
Accounts payable	(18,966)	14,754
Accrued liabilities	58,522	29,019
Income taxes payable	563,178	(25,936)
Deferred income on shipments to distributors	(21,594)	1,868
Net cash provided by operating activities	577,734	627,813
Cash flows from investing activities:
Purchases of available-for-sale securities	(2,211,372)	(2,250,810)
Proceeds from sale and maturity of available-for-sale securities	1,939,245	2,685,977
Purchases of property, plant and equipment	(28,940)	(51,825)
Other investing activities	(17,787)	(20,754)
Net cash provided by (used in) investing activities	(318,854)	362,588
Cash flows from financing activities:
Repurchases of common stock	(310,806)	(413,983)
Restricted stock units withholdings	19,602	40,582
Payments Related to Tax Withholding for Share-based Compensation	(44,428)	(29,874)
Proceeds from issuance of common stock through various stock plans	(263,751)	(250,733)
Repayments of Secured Debt	(457,918)	0
Proceeds from Issuance of Secured Debt	745,175	0
Proceeds from (Payments for) Other Financing Activities	(1,988)	(663)
Net cash used in financing activities	(314,114)	(654,671)
Net increase (decrease) in cash and cash equivalents	(55,234)	335,730
Cash and cash equivalents at beginning of period	966,695	503,816
Cash and cash equivalents at end of period	911,461
Supplemental disclosure of cash flow information:
Interest paid	38,115	28,563
Income taxes paid, net	$ 18,093	$ 2,156

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Increase (decrease) in deferred income on shipments to distributors.

+ References

No definition available.

+ Details

Name:	xlnx_IncreaseDecreaseInDeferredIncomeOnShipmentsToDistributors
Namespace Prefix:	xlnx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration