Xilinx (XLNX) 10-Q 26 Jan 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Dec. 31, 2016	Jan. 13, 2017
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Entity Registrant Name	XILINX INC
Entity Central Index Key	743,988
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--04-01
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		248,934,802

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Net revenues	$ 585,688	$ 566,235	$ 1,739,877	$ 1,642,815
Cost of revenues	178,233	178,514	522,404	496,108
Gross margin	407,455	387,721	1,217,473	1,146,707
Operating expenses:
Research and development	159,248	141,378	437,187	398,246
Selling, general and administrative	83,780	84,470	250,353	251,374
Amortization of acquisition-related intangibles	1,455	1,769	3,943	5,306
Total operating expenses	244,483	227,617	691,483	654,926
Operating income	162,972	160,104	525,990	491,781
Interest and other expense, net	392	5,053	6,130	24,793
Income before income taxes	162,580	155,051	519,860	466,988
Provision for income taxes	20,734	24,232	50,773	61,155
Net income	$ 141,846	$ 130,819	$ 469,087	$ 405,833
Net income per common share:
Basic (in dollars per share)	$ 0.57	$ 0.51	$ 1.86	$ 1.58
Diluted (in dollars per share)	0.52	0.49	1.74	1.51
Cash dividends per common share	$ 0.33	$ 0.31	$ 0.99	$ 0.93
Shares used in per share calculations:
Basic (in shares)	250,982	256,450	252,811	257,491
Diluted (in shares)	270,781	269,611	269,182	268,716

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 141,846	$ 130,819	$ 469,087	$ 405,833
Other comprehensive income (loss), net of tax:
Change in net unrealized losses on available-for-sale securities	(20,030)	(7,911)	(17,799)	(13,091)
Reclassification adjustment for (gains) losses on available-for-sale securities	(170)	8	(587)	(188)
Change in net unrealized losses on hedging transactions	(3,059)	(696)	(3,742)	(1,074)
Reclassification adjustment for losses on hedging transactions	875	2,166	1,513	6,110
Cumulative translation adjustment, net	(2,848)	(451)	(3,195)	(1,997)
Other comprehensive loss	(25,232)	(6,884)	(23,810)	(10,240)
Total comprehensive income	$ 116,614	$ 123,935	$ 445,277	$ 395,593

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Current assets:
Cash and cash equivalents	$ 839,546	$ 503,816
Short-term investments	2,414,589	2,833,883
Accounts receivable, net	340,852	307,458
Inventories	205,927	178,550
Prepaid expenses and other current assets	115,138	92,951
Total current assets	3,916,052	3,916,658
Property, plant and equipment, at cost	836,481	810,582
Accumulated depreciation and amortization	(534,977)	(527,236)
Net property, plant and equipment	301,504	283,346
Long-term investments	183,082	220,807
Goodwill	161,287	159,296
Acquisition-related intangibles, net	4,759	6,202
Other assets	269,604	232,960
Total Assets	4,836,288	4,819,269
Current liabilities:
Accounts payable	118,629	101,534
Accrued payroll and related liabilities	171,846	154,294
Income taxes payable	6,334	6,286
Deferred income on shipments to distributors	53,626	51,758
Other accrued liabilities	64,815	45,108
Current portion of long-term debt	594,792	585,417
Total current liabilities	1,010,042	944,397
Long-term debt	994,842	993,639
Deferred tax liabilities	323,777	261,467
Long-term income taxes payable	5,815	15,889
Other long-term liabilities	17,604	1,090
Commitments and contingencies	0	0
Temporary equity (Note 10)	4,605	12,894
Stockholders' equity:
Preferred stock, $.01 par value (none issued)	0	0
Common stock, $.01 par value	2,488	2,537
Additional paid-in capital	778,110	726,921
Retained earnings	1,729,446	1,867,066
Accumulated other comprehensive loss	(30,441)	(6,631)
Total stockholders’ equity	2,479,603	2,589,893
Total Liabilities, Temporary Equity and Stockholders’ Equity	$ 4,836,288	$ 4,819,269

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Apr. 02, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares issued (none issued)	0	0
Common stock, par value	$ 0.01	$ 0.01

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Cash flows from operating activities:
Net income	$ 469,087	$ 405,833
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	33,917	38,768
Amortization	12,601	13,149
Stock-based compensation	90,073	84,464
Net gain on sale of available-for-sale securities	(771)	(599)
Amortization of debt discounts	9,053	9,033
Provision for deferred income taxes	74,617	49,435
Changes in assets and liabilities:
Accounts receivable, net	(33,395)	43,439
Inventories	(27,295)	35,050
Prepaid expenses and other current assets	(8,619)	(148)
Other assets	(11,160)	(3,291)
Accounts payable	14,754	(5,511)
Accrued liabilities	29,019	4,909
Income taxes payable	(25,936)	(35,982)
Deferred income on shipments to distributors	1,868	(19,055)
Net cash provided by operating activities	627,813	619,494
Cash flows from investing activities:
Purchases of available-for-sale securities	(2,250,810)	(2,253,840)
Proceeds from sale and maturity of available-for-sale securities	2,685,977	2,183,296
Purchases of property, plant and equipment	(51,825)	(19,169)
Other investing activities	(20,754)	(5,700)
Net cash provided by (used in) investing activities	362,588	(95,413)
Cash flows from financing activities:
Repurchases of common stock	(413,983)	(299,998)
Proceeds from issuance of common stock, net of withholding taxes	10,708	21,720
Payment of dividends to stockholders	(250,733)	(240,111)
Proceeds from (Payments for) Other Financing Activities	(663)	0
Net cash used in financing activities	(654,671)	(518,389)
Net increase in cash and cash equivalents	335,730	5,692
Cash and cash equivalents at beginning of period	503,816	892,572
Cash and cash equivalents at end of period	839,546	898,264
Supplemental disclosure of cash flow information:
Interest paid	28,563	28,563
Income taxes paid, net	$ 2,156	$ 47,562

Basis of Presentation

Basis of Presentation	9 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	Basis of Presentation The accompanying interim condensed consolidated financial statements have been prepared in conformity with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X, and should be read in conjunction with the Xilinx, Inc. (Xilinx or the Company) consolidated financial statements filed with the U.S. Securities and Exchange Commission (SEC) on Form 10-K for the fiscal year ended April 2, 2016 . The interim financial statements are unaudited, but reflect all adjustments which are, in the opinion of management, of a normal, recurring nature necessary to provide a fair statement of results for the interim periods presented. The results of operations for the interim periods shown in this report are not necessarily indicative of the results that may be expected for the fiscal year ending April 1, 2017 or any future period. The Company uses a 52- to 53-week fiscal year ending on the Saturday nearest March 31. Fiscal 2017 will be a 52-week year ending on April 1, 2017 , while fiscal 2016 was a 53-week year ended on April 2, 2016 . The third quarter of fiscal 2017 was a 13-week quarter ended on December 31, 2016 . The third quarter of fiscal 2016 was a 14-week quarter ended on January 2, 2016 .

Recent Accounting Changes and A

Recent Accounting Changes and Accounting Pronouncements	9 Months Ended
	Dec. 31, 2016
Accounting Changes and Error Corrections [Abstract]
Accounting Changes and Error Corrections [Text Block]	Recent Accounting Changes and Accounting Pronouncements Adoption of New Accounting Guidance In the first quarter of fiscal 2017 , the Company adopted an amended authoritative guidance simplifying the presentation of debt issuance costs as a direct deduction from the carrying value of the debt liability rather than showing the debt issuance costs as an asset. We have applied the amendment retrospectively to the comparable period presented and it did not have a significant impact on our financial statements. In the first quarter of fiscal 2017 , the Company early adopted the authoritative guidance that simplifies how share-based payments are accounted for and presented in the financial statements. Under the new guidance, excess tax benefits or tax deficiencies are recorded in the condensed consolidated statement of income when the awards vest or are settled. Previously, they were recorded in stockholders' equity of the condensed consolidated balance sheet. In addition, cash flows related to excess tax benefits or tax deficiencies are now classified as an operating activity, with prior periods adjusted accordingly. While the new guidance provides an accounting policy election to account for forfeitures as they occur, the Company elected to continue to estimate forfeitures to determine the amount of compensation cost to be recognized in each period. As a result of the adoption of this guidance, the condensed consolidated statement of cash flows for the nine months ended January 2, 2016 was adjusted as follows: a $12.3 million increase to net cash provided by operating activities and a $12.3 million increase to the net cash used in financing activities. Additionally, the Company recorded excess tax benefits of $1.2 million and $10.9 million for the third quarter and first nine months of fiscal 2017, respectively. This resulted in no change in net income per diluted share for the third quarter and an increase in net income per diluted share of $0.04 for the first nine months of fiscal 2017 in the condensed consolidated statement of income as a component of the provision for income taxes. Recent Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (FASB) issued new global revenue recognition guidance that replaces virtually all existing U.S. GAAP guidance on contracts with customers and the related other assets and deferred costs. The guidance provides a five-step process for recognizing revenue that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires expanded qualitative and quantitative disclosures relating to the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. In July 2015, the FASB approved the deferral of the effective date of this guidance by one year. As a result, this guidance will be effective for the Company beginning in fiscal year 2019, with an option to early adopt in fiscal year 2018. The new guidance is required to be applied retrospectively to each prior reporting period presented, or retrospectively with the cumulative effect of initially applying it recognized at the date of initial application. The Company is currently evaluating the full impact of this new guidance on its consolidated financial statements, including selection of the transition method. However, assuming all other revenue recognition criteria have been met, it is likely that the new guidance would require the Company to recognize revenue and cost relating to distributor sales upon product delivery, subject to estimated allowance for distributor price adjustments and rights of return. In February 2016, the FASB issued the authoritative guidance on leases. The new guidance requires the recognition of assets and liabilities arising from lease transactions on the balance sheet and will also require significant additional disclosures about the amount, timing and uncertainty of cash flows from leases. Accordingly, a lessee will recognize a lease asset for its right to use the underlying asset and a lease liability for the corresponding lease obligation. The new guidance is effective for public business entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, which for Xilinx would be the first quarter of fiscal year 2020. Early adoption is permitted. The new guidance must be adopted using a modified retrospective transition and provides for certain practical expedients. In addition, the transition will require application of the new guidance at the beginning of the earliest comparative period presented. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements. In March 2016, the FASB finalized its amendments in the new revenue recognition guidance on assessing whether an entity is a principal or an agent in a revenue transaction. The amendments clarify how an entity should identify the unit of accounting for the principal versus agent evaluation, and how it should apply the control principle to certain types of arrangements, such as service transactions, by explaining what a principal controls before the specified good or service is transferred to the customer. The FASB also addressed how an entity acting as a principal would determine its transaction price when it does not know the price charged to its customer for its goods or services by an intermediary. The amendments have the same effective date and transition requirements as the new revenue recognition guidance, which for Xilinx would be the beginning of fiscal year 2019. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements. In April 2016, the FASB finalized amendments in the new revenue recognition guidance on identifying performance obligations and accounting for licenses of intellectual property. The amendments address implementation issues that were raised by stakeholders and discussed by the Revenue Recognition Transition Resource Group (TRG). The amendments have the same effective date and transition requirements as the new revenue recognition guidance, which for Xilinx would be the beginning of fiscal year 2019. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements. In May 2016, the FASB finalized amendments in the new revenue recognition guidance on collectability, noncash consideration, presentation of sales tax, and transition. The amendments are intended to address implementation issues that were raised by stakeholders and discussed by TRG, and provide additional practical expedients. The amendments have the same effective date and transition requirements as the new revenue recognition guidance, which for Xilinx would be the beginning of fiscal year 2019. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements. In June 2016, the FASB issued the authoritative guidance which introduces new guidance for the accounting for credit losses on instruments for both financial services and non-financial services entities. The new guidance introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments. It also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The new guidance will be effective for public business entities in fiscal years beginning after December 15, 2019, including interim periods within those years, which for Xilinx would be the first quarter of fiscal year 2021. Early adoption is permitted. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements. In August 2016, the FASB issued authoritative guidance for cash flow classification. The new guidance is intended to reduce diversity in practice in how cash receipts and cash payments are classified in the statement of cash flows. The new guidance will be effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those years, which for Xilinx would be the first quarter of fiscal year 2019. Early adoption is permitted. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements. In October 2016, the FASB issued authoritative guidance for accounting for income taxes which eliminates the deferred tax effects of intra-entity asset transfers other than inventory. As a result, a reporting entity would recognize the tax expense from the sale of an asset in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. The new guidance will be effective for public business entities in fiscal years beginning after December 15, 2017, including interim periods within those years, which for Xilinx would be the first quarter of fiscal year 2019. Early adoption is permitted. The Company is currently evaluating the impact of this new guidance on its consolidated financial statements.

Significant Customers and Conce

Significant Customers and Concentrations of Credit Risk (Notes)	9 Months Ended
	Dec. 31, 2016
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 31, 2016 and April 2, 2016 , Avnet accounted for 60% and 75% of the Company’s total net accounts receivable, respectively. For the third quarter and first nine months of fiscal 2017 , resale of product through Avnet accounted for 45% and 43% of the Company’s worldwide net revenues, respectively. For the third quarter and the first nine months of fiscal 2016 , resale of product through Avnet accounted for 49% and 50% 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 2017 and 2016 . The Company mitigates concentrations of credit risk in its investments in debt securities by currently investing approximately 86% 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 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 31, 2016 , approximately 37% 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.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The guidance for fair value measurements established by the FASB defines fair value as the exchange price that would be received from selling an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in which Xilinx would transact and also considers assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions and risk of nonperformance. The Company determines the fair value for marketable debt securities using industry standard pricing services, data providers and other third-party sources and by internally performing valuation testing and analysis. The Company primarily uses a consensus price or weighted-average price for its fair value assessment. The Company determines the consensus price using market prices from a variety of industry standard pricing services, data providers, security master files from large financial institutions and other third party sources and uses those multiple prices as inputs into a distribution-curve-based algorithm to determine the daily market value. The pricing services use multiple inputs to determine market prices, including reportable trades, benchmark yield curves, credit spreads and broker/dealer quotes as well as other industry and economic events. For certain securities with short maturities, such as discount commercial paper and certificates of deposit, the security is accreted from purchase price to face value at maturity. If a subsequent transaction on the same security is observed in the marketplace, the price on the subsequent transaction is used as the current daily market price and the security will be accreted to face value based on the revised price. For certain other securities, such as student loan auction rate securities, the Company performs its own valuation analysis using a discounted cash flow pricing model. The Company validates the consensus prices by taking random samples from each asset type and corroborating those prices using reported trade activity, benchmark yield curves, binding broker/dealer quotes or other relevant price information. There have not been any changes to the Company’s fair value methodology during the first nine months of fiscal 2017 and the Company did not adjust or override any fair value measurements as of December 31, 2016 . Fair Value Hierarchy The fair value framework requires the categorization of assets and liabilities into three levels based upon the assumptions (inputs) used to price the assets or liabilities. The guidance for fair value measurements requires that assets and liabilities carried at fair value be classified and disclosed in one of the following categories: Level 1 — Quoted (unadjusted) prices in active markets for identical assets or liabilities. The Company’s Level 1 assets consist of U.S. government and agency securities and money market funds. Level 2 — Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability. The Company’s Level 2 assets consist of financial institution securities, non-financial institution securities, municipal bonds, U.S. government and agency securities, foreign government and agency securities, mortgage-backed securities, debt mutual funds, bank loans, asset-backed securities and commercial mortgage-backed securities. The Company’s Level 2 assets and liabilities also include foreign currency forward contracts and commodity swap contracts. Level 3 — Unobservable inputs to the valuation methodology that are supported by little or no market activity and that are significant to the measurement of the fair value of the assets or liabilities. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques, as well as significant management judgment or estimation. The Company’s Level 3 assets and liabilities include student loan auction rate securities. Assets and Liabilities Measured at Fair Value on a Recurring Basis In instances where the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability. The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2016 and April 2, 2016 : December 31, 2016 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 366,460 $ — $ — $ 366,460 Financial institution securities — 299,875 — 299,875 Non-financial institution securities — 22,689 — 22,689 U.S. government and agency securities 24,990 58,282 — 83,272 Foreign government and agency securities — 4,998 — 4,998 Short-term investments: Financial institution securities — 174,997 — 174,997 Non-financial institution securities — 272,956 — 272,956 Municipal bonds — 50,067 — 50,067 U.S. government and agency securities 29,607 63,569 — 93,176 Foreign government and agency securities — 89,752 — 89,752 Asset-backed securities — 210,465 — 210,465 Mortgage-backed securities — 1,141,926 — 1,141,926 Debt mutual funds — 33,952 — 33,952 Bank loans — 131,056 — 131,056 Commercial mortgage-backed securities — 216,242 — 216,242 Long-term investments: Auction rate securities — — 10,227 10,227 Asset-backed securities — 5,388 — 5,388 Municipal bonds — 4,726 — 4,726 Mortgage-backed securities — 110,758 — 110,758 Debt mutual fund — 51,983 — 51,983 Total assets measured at fair value $ 421,057 $ 2,943,681 $ 10,227 $ 3,374,965 Liabilities Derivative financial instruments, net $ — $ 1,753 $ — $ 1,753 Total liabilities measured at fair value $ — $ 1,753 $ — $ 1,753 Net assets measured at fair value $ 421,057 $ 2,941,928 $ 10,227 $ 3,373,212 April 2, 2016 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 232,698 $ — $ — $ 232,698 Non-financial institution securities — 104,964 — 104,964 Foreign government and agency securities — 98,967 — 98,967 Municipal bonds — 1,003 — 1,003 Short-term investments: Financial institution securities — 284,853 — 284,853 Non-financial institution securities — 460,148 — 460,148 Municipal Bonds — 61,579 — 61,579 U.S. government and agency securities 81,873 110,420 — 192,293 Foreign government and agency securities — 214,201 — 214,201 Mortgage-backed securities — 1,067,157 — 1,067,157 Debt mutual fund — 35,116 — 35,116 Bank loans — 102,015 — 102,015 Asset-backed securities — 210,051 — 210,051 Commercial mortgage-backed securities — 206,470 — 206,470 Long-term investments: Auction rate securities — — 9,977 9,977 Municipal bonds — 7,100 — 7,100 Mortgage-backed securities — 140,382 — 140,382 Debt mutual fund — 56,785 — 56,785 Asset-backed securities — 6,563 — 6,563 Derivative financial instruments, net — 744 — 744 Total assets measured at fair value $ 314,571 $ 3,168,518 $ 9,977 $ 3,493,066 Changes in Level 3 Instruments Measured at Fair Value on a Recurring Basis The following table is a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3): Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Balance as of beginning of period $ 10,160 $ 10,413 $ 9,977 $ 10,312 Total unrealized gains (losses): Included in other comprehensive income (loss) 67 (302 ) 250 (201 ) Balance as of end of period $ 10,227 $ 10,111 $ 10,227 $ 10,111 As of December 31, 2016 , marketable securities measured at fair value using Level 3 inputs were comprised of $10.2 million of student loan auction rate securities. There was no material change to the input assumptions of the pricing model for these student loan auction rate securities. Financial Instruments Not Recorded at Fair Value on a Recurring Basis The Company’s 2.625% Senior Convertible Debentures due June 15, 2017 (2017 Convertible Notes), 2.125% Notes due 2019 (2019 Notes) and 3.000% Notes due 2021 (2021 Notes) are measured at fair value on a quarterly basis for disclosure purposes. The fair values of the 2017 Convertible Notes, 2019 Notes and 2021 Notes as of December 31, 2016 were approximately $1.25 billion , $500.8 million and $506.0 million , respectively, based on the last trading price of the respective debentures for the period (classified as Level 2 in fair value hierarchy due to relatively low trading volume).

Financial Instruments

Financial Instruments	9 Months Ended
	Dec. 31, 2016
Investments, All Other Investments [Abstract]
Financial Instruments	Financial Instruments The following is a summary of cash equivalents and available-for-sale securities as of the end of the periods presented: December 31, 2016 April 2, 2016 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Money market funds $ 366,460 $ — $ — $ 366,460 $ 232,698 $ — $ — $ 232,698 Financial institution securities 474,872 — — 474,872 284,853 — — 284,853 Non-financial institution securities 295,848 541 (744 ) 295,645 564,480 862 (230 ) 565,112 Auction rate securities 10,500 — (273 ) 10,227 10,500 — (523 ) 9,977 Municipal bonds 55,028 331 (566 ) 54,793 68,938 877 (133 ) 69,682 U.S. government and agency securities 176,583 7 (142 ) 176,448 192,291 73 (71 ) 192,293 Foreign government and agency securities 94,783 — (33 ) 94,750 313,168 — — 313,168 Mortgage-backed securities 1,264,983 5,906 (18,205 ) 1,252,684 1,200,071 12,848 (5,380 ) 1,207,539 Asset-backed securities 215,879 677 (703 ) 215,853 216,068 1,151 (605 ) 216,614 Debt mutual funds 101,350 — (15,415 ) 85,935 101,350 — (9,449 ) 91,901 Bank loans 130,029 1,102 (75 ) 131,056 102,092 25 (102 ) 102,015 Commercial mortgage- backed securities 219,675 128 (3,561 ) 216,242 207,847 432 (1,809 ) 206,470 $ 3,405,990 $ 8,692 $ (39,717 ) $ 3,374,965 $ 3,494,356 $ 16,268 $ (18,302 ) $ 3,492,322 The following tables show the fair values and gross unrealized losses of the Company’s investments, aggregated by investment category, for individual securities that have been in a continuous unrealized loss position for the length of time specified, as of December 31, 2016 and April 2, 2016 : December 31, 2016 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 69,567 $ (733 ) $ 1,523 $ (11 ) $ 71,090 $ (744 ) Auction rate securities — — 10,227 (273 ) 10,227 (273 ) Municipal bonds 32,671 (537 ) 1,730 (29 ) 34,401 (566 ) U.S. government and agency securities 82,785 (142 ) — — 82,785 (142 ) Foreign government and agency securities 14,976 (33 ) — — 14,976 (33 ) Mortgage-backed securities 914,938 (15,537 ) 118,236 (2,668 ) 1,033,174 (18,205 ) Asset-backed securities 87,937 (561 ) 11,380 (142 ) 99,317 (703 ) Debt mutual funds — — 85,935 (15,415 ) 85,935 (15,415 ) Bank loans 12,264 (75 ) — — 12,264 (75 ) Commercial mortgage- backed securities 151,331 (1,984 ) 24,384 (1,577 ) 175,715 (3,561 ) $ 1,366,469 $ (19,602 ) $ 253,415 $ (20,115 ) $ 1,619,884 $ (39,717 ) April 2, 2016 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 52,756 $ (230 ) $ — $ — $ 52,756 $ (230 ) Auction rate securities — — 9,977 (523 ) 9,977 (523 ) Municipal bonds 10,138 (44 ) 3,867 (89 ) 14,005 (133 ) U.S. government and agency securities 84,024 (71 ) — — 84,024 (71 ) Mortgage-backed securities 346,560 (3,916 ) 114,285 (1,464 ) 460,845 (5,380 ) Asset-backed securities 81,038 (502 ) 20,793 (103 ) 101,831 (605 ) Debt mutual funds — — 91,901 (9,449 ) 91,901 (9,449 ) Bank loans 34,358 (31 ) 42,832 (71 ) 77,190 (102 ) Commercial mortgage- backed securities 141,761 (878 ) 2,150 (931 ) 143,911 (1,809 ) $ 750,635 $ (5,672 ) $ 285,805 $ (12,630 ) $ 1,036,440 $ (18,302 ) As of December 31, 2016 , the gross unrealized losses that had been outstanding for less than twelve months were primarily related to mortgage-backed securities and were due to the general rising of the interest-rate environment. However, the percentage of such losses to the total estimated fair value of the mortgage-backed securities was relatively insignificant. The gross unrealized losses that had been outstanding for more than twelve months were primarily related to debt mutual funds and mortgage-backed securities, which were primarily due to the general rising of the interest-rate environment and foreign currency movement. The Company reviewed the investment portfolio and determined that the gross unrealized losses on these investments as of December 31, 2016 and April 2, 2016 were temporary in nature. These investments are highly rated by the credit rating agencies and there have been no defaults on any of these securities, and we have received interest payments as they become due. Additionally, in the past several years a portion of the Company's investment in the mortgage-backed securities were redeemed or prepaid by the debtors at par. Furthermore, the aggregate of individual unrealized losses that had been outstanding for twelve months or more was not significant as of December 31, 2016 and April 2, 2016 . The Company neither intends to sell these investments nor concludes that it is more-likely-than-not that it will have to sell them until recovery of their carrying values. The Company also believes that it will be able to collect both principal and interest amounts due to the Company at maturity, given the high credit quality of these investments and any related underlying collateral. The amortized cost and estimated fair value of marketable debt securities (financial institution securities, non-financial institution securities, auction rate securities, municipal bonds, U.S. and foreign government and agency securities, mortgage-backed securities, asset-backed securities, bank loans and commercial mortgage-backed securities), by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties. December 31, 2016 (In thousands) Amortized Estimated Due in one year or less $ 839,365 $ 839,380 Due after one year through five years 496,399 494,352 Due after five years through ten years 243,772 243,648 Due after ten years 1,358,644 1,345,190 $ 2,938,180 $ 2,922,570 As of December 31, 2016 , $1.95 billion of marketable debt securities with contractual maturities of greater than one year were classified as short-term investments. Additionally, the above table did not include investments in money market and mutual funds because these funds do not have specific contractual maturities. Certain information related to available-for-sale securities is as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Proceeds from sale of available-for-sale securities $ 130,891 $ 82,396 $ 384,236 $ 203,426 Gross realized gains on sale of available-for-sale securities $ 624 $ 203 $ 2,055 $ 1,038 Gross realized losses on sale of available-for-sale securities (679 ) (221 ) (1,284 ) (439 ) Net realized gains (losses) on sale of available-for-sale securities $ (55 ) $ (18 ) $ 771 $ 599 Amortization of premiums on available-for-sale securities $ 8,034 $ 6,906 $ 22,209 $ 20,417 The cost of securities matured or sold is based on the specific identification method.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company’s primary objective for holding derivative financial instruments is to manage foreign currency exchange rate risk and interest rate risk. As a result of the use of derivative financial instruments, the Company is exposed to the risk that counterparties to derivative contracts may fail to meet their contractual obligations. The Company manages counterparty credit risk in derivative contracts by reviewing counterparty creditworthiness on a regular basis, establishing collateral requirement and limiting exposure to any single counterparty. The right of set-off that exists with certain transactions enables the Company to net amounts due to and from the counterparty, reducing the maximum loss from credit risk in the event of counterparty default. As of December 31, 2016 and April 2, 2016 , the Company had the following outstanding forward currency exchange contracts (in notional amount), which were derivative financial instruments: (In thousands and U.S. dollars) December 31, 2016 April 2, 2016 Singapore Dollar $ 21,448 $ 26,978 Euro 18,436 19,123 Indian Rupee 34,606 23,302 British Pound 8,429 10,716 Japanese Yen 3,834 3,387 $ 86,753 $ 83,506 As part of the Company’s strategy to reduce volatility of operating expenses due to foreign exchange rate fluctuations, the Company employs a hedging program with a forward outlook of up to two years for major foreign-currency-denominated operating expenses. The outstanding forward currency exchange contracts expire at various dates through August 2018 . The majority of net unrealized gains, which approximate the fair market value of the outstanding forward currency exchange contracts, are expected to be realized into net income within the next two years . As of December 31, 2016 , all of the forward foreign currency exchange contracts were designated and qualified as cash flow hedges and the effective portion of the gain or loss on the forward contracts was reported as a component of other comprehensive income (loss) and reclassified into net income in the same period during which the hedged transaction affects earnings. The estimated amount of such gains or losses as of December 31, 2016 that is expected to be reclassified into earnings was not material. The ineffective portion of the gains or losses on the forward contracts was included in the net income for all periods presented. The Company may enter into forward foreign currency exchange contracts to hedge firm commitments such as acquisitions and capital expenditures. Gains and losses on foreign currency forward contracts that are designated as hedges of anticipated transactions, for which a firm commitment has been attained and the hedged relationship has been effective, are deferred and included in income or expenses in the same period that the underlying transaction is settled. Gains and losses on any instruments not meeting the above criteria are recognized in income or expenses in the consolidated statements of income as they are incurred. The Company had the following derivative instruments as of December 31, 2016 and April 2, 2016 , located on the condensed consolidated balance sheet, utilized for risk management purposes detailed above: Foreign Exchange Contracts Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value December 31, 2016 Prepaid expenses and other current assets $ 380 Other accrued liabilities $ 2,133 April 2, 2016 Prepaid expenses and other current assets $ 2,161 Other accrued liabilities $ 1,417 The Company does not offset or net the fair value amounts of derivative financial instruments in its condensed consolidated balance sheets. The potential effect of rights of set-off associated with the derivative financial instruments was not material to the Company's condensed consolidated balance sheet for all periods presented. The following table summarizes the effect of derivative instruments on the condensed consolidated statements of income for the third quarter and the first nine months of fiscal 2017 and 2016 : Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Amount of losses recognized in other comprehensive income on derivative (effective portion of cash flow hedging) $ (2,185 ) $ (1,470 ) $ (2,229 ) $ (5,035 ) Amount of losses reclassified from accumulated other comprehensive income into income (effective portion) * $ (875 ) $ (2,166 ) $ (1,513 ) $ (6,110 ) Amount of gains (losses) recorded (ineffective portion) * $ 23 $ 7 $ 31 $ (15 ) * Recorded in Interest and Other Expense, net within the condensed consolidated statements of income.

Stock-Based Compensation Plans

Stock-Based Compensation Plans	9 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation Plans	Stock-Based Compensation Plans The Company’s equity incentive plans are broad-based, long-term retention programs that cover employees, consultants and non-employee directors of the Company. These plans are intended to attract and retain talented employees, consultants and non-employee directors and to provide such persons with a proprietary interest in the Company. Stock-Based Compensation The following table summarizes stock-based compensation expense related to stock awards granted under the Company’s equity incentive plans and rights to acquire stock granted under the Company’s Employee Stock Purchase Plan (ESPP): Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Stock-based compensation included in: Cost of revenues $ 1,945 $ 2,145 $ 5,994 $ 5,872 Research and development 17,154 16,935 48,803 44,561 Selling, general and administrative 11,768 12,383 35,276 34,031 $ 30,867 $ 31,463 $ 90,073 $ 84,464 As a result of the early adoption of new guidance on accounting for share-based payments in the first quarter of fiscal 2017 , during the third quarter and first nine months of fiscal 2017 the Company recorded excess tax benefits realized for the tax deduction from option exercises and other awards of $1.2 million and $10.9 million , respectively, in the provision for income taxes. During the third quarter and first nine months of fiscal 2016 , the Company recorded excess tax benefits realized for the tax deduction from option exercises and other awards of $1.2 million and $8.5 million , respectively, in additional paid-in capital. Employee Stock Option Plans A summary of the Company’s option plans activity and related information is as follows: Options Outstanding (Shares in thousands) Number of Shares Weighted-Average Exercise Price Per Share April 2, 2016 1,257 $ 25.42 Exercised (1,010 ) $ 24.78 Forfeited/cancelled/expired (3 ) $ 26.21 December 31, 2016 244 $ 28.03 Options exercisable at: December 31, 2016 243 $ 28.01 April 2, 2016 1,241 $ 25.33 The types of awards allowed under the 2007 Equity Incentive Plan (2007 Equity Plan) include incentive stock options, non-qualified stock options, restricted stock units (RSUs), restricted stock and stock appreciation rights. To date, the Company has issued a mix of non-qualified stock options and RSUs under the 2007 Equity Plan. As of December 31, 2016 , 12.7 million shares remained available for grant under the 2007 Equity Plan. The total pre-tax intrinsic value of options exercised during the three and nine months ended December 31, 2016 was $2.8 million and $24.2 million , respectively. The total pre-tax intrinsic value of options exercised during the three and nine months ended January 2, 2016 was $8.3 million and $31.6 million , respectively. This intrinsic value represents the difference between the exercise price and the fair market value of the Company’s common stock on the date of exercise. The Company's stock-based compensation expense relating to options during the first nine months of fiscal 2017 and 2016 was not material. RSU Awards A summary of the Company’s RSU activity and related information is as follows: RSUs Outstanding (Shares in thousands) Number of Shares Weighted-Average Grant-Date Fair Value Per Share April 2, 2016 6,678 $ 40.74 Granted 3,130 $ 43.40 Vested (2,269 ) $ 39.49 Cancelled (412 ) $ 41.15 December 31, 2016 7,127 $ 42.27 The estimated fair values of RSU awards were calculated based on the market price of Xilinx common stock on the date of grant, reduced by the present value of dividends expected to be paid on Xilinx common stock prior to vesting. The per share weighted-average fair value of RSUs granted during the third quarter of fiscal 2017 was $49.50 ( $43.41 for the third quarter of fiscal 2016 ), and for the first nine months of fiscal 2017 was $43.40 ( $41.24 for the first nine months of fiscal 2016 ), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: Three Months Ended Nine Months Ended December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Risk-free interest rate 1.4 % 1.3 % 0.9 % 1.3 % Dividend yield 2.5 % 2.7 % 2.8 % 2.8 % For the majority of RSUs granted, the number of shares of common stock issued on the date the RSU awards vest is net of the minimum statutory withholding requirements that we pay in cash to the appropriate taxing authorities on behalf of our employees. In the condensed consolidated statement of cash flows, these amounts have been included as a reduction in the cash proceeds from issuance of common stock under our various stock plans. During the first nine months of fiscal 2017 and 2016 , we withheld $29.9 million and $29.8 million worth of RSU awards, respectively, to satisfy the employees’ tax obligations. Employee Stock Purchase Plan Under the ESPP, shares are only issued during the second and fourth quarters of each fiscal year. Employees purchased 446 thousand shares for $15.0 million during the second quarter of fiscal 2017 and 438 thousand shares for $14.5 million in the second quarter of fiscal 2016 . The per-share weighted-average fair value of stock purchase rights granted under the ESPP during the second quarter of fiscal 2017 and 2016 was $11.64 and $9.78 , respectively. The fair values of stock purchase plan rights granted in the second quarter of fiscal 2017 and 2016 were estimated using the Black-Scholes option pricing model at the date of grant using the following assumptions: 2017 2016 Expected life of options (years) 1.25 1.25 Expected stock price volatility 0.23 0.25 Risk-free interest rate 0.5 % 0.4 % Dividend yield 2.6 % 3.0 % The next scheduled purchase under the ESPP is in the fourth quarter of fiscal 2017. As of December 31, 2016 , 9.0 million shares were available for future issuance under the ESPP.

Net Income Per Common Share

Net Income Per Common Share	9 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income Per Common Share	Net Income Per Common Share The computation of basic net income per common share for all periods presented is derived from the information on the condensed consolidated statements of income, and there are no reconciling items in the numerator used to compute diluted net income per common share. The following table summarizes the computation of basic and diluted net income per common share: Three Months Ended Nine Months Ended (In thousands, except per share amounts) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Net income available to common stockholders $ 141,846 $ 130,819 $ 469,087 $ 405,833 Weighted average common shares outstanding-basic 250,982 256,450 252,811 257,491 Dilutive effect of employee equity incentive plans 2,907 2,538 2,400 2,416 Dilutive effect of 2017 Convertible Notes [1] 10,165 8,067 9,212 7,303 Dilutive effect of warrants 6,727 2,556 4,759 1,506 Weighted average common shares outstanding-diluted 270,781 269,611 269,182 268,716 Basic earnings per common share $ 0.57 $ 0.51 $ 1.86 $ 1.58 Diluted earnings per common share $ 0.52 $ 0.49 $ 1.74 $ 1.51 [1] To hedge against potential dilution upon conversion of the 2017 Convertible Notes, the Company purchased call options on its common stock from the hedge counter-parties. The call options give the Company the right to purchase up to 20.8 million shares of its common stock at $28.86 per share. These call options are not considered for purposes of calculating the total shares outstanding under the basic and diluted net income per share, as their effect would be anti-dilutive. Upon exercise, the call options would serve to neutralize the dilutive effect of the 2017 Convertible Notes and reduce the weighted number of diluted shares used in per share calculations. The total shares used in the denominator of the diluted net income per common share calculation includes potentially dilutive common equivalent shares outstanding that are not included in basic net income per common share by applying the treasury stock method to the impact of the equity incentive plans and to the incremental shares issuable assuming conversion of the Company's convertible debt and warrants (see "Note 10. Debt and Credit Facility" for more discussion of the Company's debt and warrants). Outstanding stock options and RSUs under the Company's stock award plans to purchase approximately 296 thousand and 4.3 million shares, for the third quarter and the first nine months of fiscal 2017 , respectively, were excluded from diluted net income per common share by applying the treasury stock method, as their inclusion would have been anti-dilutive. These options and RSUs could be dilutive in the future if the Company’s average share price increases and is greater than the combined exercise prices and the unamortized fair values of these options and RSUs.

Inventories

Inventories	9 Months Ended
	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventory Disclosure [Text Block]	Inventories Inventories are stated at the lower of actual cost (determined using the first-in, first-out method) or market (estimated net realizable value) and are comprised of the following: (In thousands) December 31, 2016 April 2, 2016 Raw materials $ 15,354 $ 15,346 Work-in-process 147,650 123,675 Finished goods 42,923 39,529 $ 205,927 $ 178,550

Debt and Credit Facility

Debt and Credit Facility	9 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Debt and Credit Facility [Text Block]	Debt and Credit Facility 2017 Convertible Notes As of December 31, 2016 , the Company had $600.0 million principal amount of 2017 Convertible Notes outstanding. The 2017 Convertible Notes are senior in right of payment to the Company’s existing and future unsecured indebtedness that is expressly subordinated in right of payment to the 2017 Convertible Notes, and are ranked equally with all of our other existing and future unsecured senior indebtedness, including the 2019 and 2021 Notes discussed below. The Company may not redeem the 2017 Convertible Notes prior to maturity. The 2017 Convertible Notes are convertible, subject to certain conditions, into shares of Xilinx common stock at a conversion rate of 34.6495 shares of common stock per $1 thousand principal amount of the 2017 Convertible Notes, representing an effective conversion price of approximately $28.86 per share of common stock. The conversion rate is subject to adjustment for certain events as outlined in the indenture governing the 2017 Convertible Notes, but will not be adjusted for accrued interest. One of the conditions allowing holders of the 2017 Convertible Notes to convert during any fiscal quarter is if the last reported sale price of the Company's common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the preceding fiscal quarter is greater than or equal to 130% of the conversion price on each applicable trading day. This condition was met as of December 31, 2016 and as a result, the 2017 Convertible Notes were convertible at the option of the holders. As of December 31, 2016 , the 2017 Convertible Notes were classified as a current liability on the Company's condensed consolidated balance sheet. Additionally, a portion of the equity component attributable to the conversion feature of the 2017 Convertible Notes was classified in temporary stockholders' equity. The amount classified as temporary equity was equal to the difference between the principal amount and carrying value of the 2017 Convertible Notes. Upon conversion, the Company would pay the holders of the 2017 Convertible Notes cash up to the aggregate principal amount of the 2017 Convertible Notes. If the conversion value exceeds the principal amount, the Company would deliver shares of its common stock in respect to the remainder of its conversion obligation in excess of the aggregate principal amount (conversion spread). Accordingly, there is no adjustment to the numerator in the net income per common share computation for the cash settled portion of the 2017 Convertible Notes, as that portion of the debt liability will always be settled in cash. The conversion spread is included in the denominator for the computation of diluted net income per common share, using the treasury stock method. The Company received conversion notices for an aggregate of $142.0 million in principal amount of the 2017 Convertible Notes during the third quarter of fiscal year 2017. Settlements of these conversion requests are expected to be completed in the fourth quarter of fiscal year 2017 based on a 30 trading-day observation period subsequent to the receipt of the conversion notices. The carrying values of the liability and equity components of the 2017 Convertible Notes are reflected in the Company’s condensed consolidated balance sheets as follows: (In thousands) December 31, 2016 April 2, 2016 Liability component: Principal amount of the 2017 Convertible Notes (discount is based on imputed discount rate of 5.75%) $ 600,000 $ 600,000 Unamortized discount of liability component (6,477 ) (18,135 ) Hedge accounting adjustment – sale of interest rate swap 1,872 5,241 Unamortized debt issuance costs associated with 2017 Convertible Notes (603 ) (1,689 ) Net carrying value of the 2017 Convertible Notes $ 594,792 $ 585,417 Equity component (including temporary equity) – net carrying value $ 66,415 $ 66,415 The remaining unamortized debt discount, net of the hedge accounting adjustment from the previous sale of the interest rate swap, is being amortized as additional non-cash interest expense over the expected remaining term of the 2017 Convertible Notes. As of December 31, 2016 , the remaining term of the 2017 Convertible Notes is 0.5 years. As of December 31, 2016 , the if-converted value of the 2017 Convertible Notes was $1.18 billion . Interest expense related to the 2017 Convertible Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Contractual coupon interest $ 3,938 $ 3,938 $ 11,813 $ 11,813 Amortization of debt issuance costs 362 362 1,086 1,086 Amortization of debt discount, net 2,763 2,763 8,289 8,289 Total interest expense related to the 2017 Convertible Notes $ 7,063 $ 7,063 $ 21,188 $ 21,188 To hedge against potential dilution upon conversion of the 2017 Convertible Notes, the Company purchased call options on its common stock from the hedge counter parties. The call options give the Company the right to purchase up to 20.8 million shares of its common stock at $28.86 per share. The call options will terminate upon the earlier of the maturity of the 2017 Convertible Notes or the last day any of the 2017 Convertible Notes remain outstanding. To reduce the hedging cost, under separate transactions the Company sold warrants to the hedge counter parties, which give the hedge counter parties the right to purchase up to 20.8 million shares of the Company’s common stock at $40.89 per share. These warrants expire on a gradual basis over a specified period starting on September 13, 2017. 2019 and 2021 Notes As of December 31, 2016 , the Company had $500.0 million principal amount of 2019 Notes and $500.0 million principal amount of 2021 Notes with maturity dates of March 15, 2019 and March 15, 2021 respectively. The 2019 and 2021 Notes were offered to the public at a discounted price of 99.477% and 99.281% of par, respectively. Interest on the 2019 and 2021 Notes is payable semiannually on March 15 and September 15. As of December 31, 2016 , the remaining term of the 2019 and 2021 Notes are 2.2 years and 4.2 years, respectively. The following table summarizes the carrying value of the 2019 and 2021 Notes as of December 31, 2016 and April 2, 2016 : (In thousands) December 31, 2016 April 2, 2016 Principal amount of the 2019 Notes (discount is based on imputed interest rate of 2.236%) $ 500,000 $ 500,000 Unamortized discount of the 2019 Notes (1,169 ) (1,560 ) Unamortized debt issuance costs associated with the 2019 Notes (740 ) (996 ) Principal amount of the 2021 Notes (discount is based on imputed interest rate of 3.115%) 500,000 500,000 Unamortized discount of the 2021 Notes (2,233 ) (2,605 ) Unamortized debt issuance costs associated with the 2021 Notes (1,016 ) (1,200 ) Total carrying value $ 994,842 $ 993,639 Interest expense related to the 2019 and 2021 Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Contractual coupon interest $ 6,406 $ 6,406 $ 19,219 $ 19,219 Amortization of debt issuance costs 146 146 439 439 Amortization of debt discount, net 257 251 764 745 Total interest expense related to the 2019 and 2021 Notes $ 6,809 $ 6,803 $ 20,422 $ 20,403 Revolving Credit Facility On December 7, 2016 , the Company entered into a $400.0 million senior unsecured revolving credit facility that, upon certain conditions, may be extended by an additional $150.0 million , with a syndicate of banks (expiring in December 2021 ). Borrowings under the credit facility will bear interest at a benchmark rate plus an applicable margin based upon the Company’s credit rating. In connection with the credit facility, the Company is required to maintain certain financial and nonfinancial covenants. As of December 31, 2016 , the Company had made no borrowings under this credit facility and was not in violation of any of the covenants. The previous $250.0 million senior unsecured revolving credit facility, which was entered on December 7, 2011 , expired in December 2016 .

Common Stock Repurchase Program

Common Stock Repurchase Program	9 Months Ended
	Dec. 31, 2016
Common Stock Repurchase Program [Abstract]
Common Stock and Debentures Repurchase Program [Text Block]	Common Stock Repurchase Program The Board of Directors has approved stock repurchase programs enabling the Company to repurchase its common stock in the open market or through negotiated transactions with independent financial institutions. On November 17, 2014, the Board authorized the repurchase of $800.0 million of the Company's common stock (2014 Repurchase Program). On May 16, 2016, the Board authorized the repurchase of up to $1.00 billion of the Company's common stock and debentures (2016 Repurchase Program). The 2014 and 2016 Repurchase Programs have no stated expiration date. Through December 31, 2016 , the Company had used all of the $800.0 million authorized under the 2014 Repurchase Program and $209.8 million of the $1.00 billion authorized under the 2016 Repurchase Program, leaving $790.2 million available for future repurchases. The Company’s current policy is to retire all repurchased shares, and consequently, no treasury shares were held as of December 31, 2016 and April 2, 2016 . During the first nine months of fiscal 2017 , the Company repurchased 8.0 million shares of common stock in the open market and through an accelerated share repurchase agreement with an independent financial institution for a total of $414.0 million . During the first nine months of fiscal 2016 , the Company repurchased 6.7 million shares of common stock in the open market for a total of $300.0 million .

Interest and Other Expense, Net

Interest and Other Expense, Net	9 Months Ended
	Dec. 31, 2016
Other Income and Expenses [Abstract]
Interest and Other Expense, Net	Interest and Other Expense, Net The components of interest and other expense, net are as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Interest income $ 14,504 $ 12,640 $ 38,068 $ 28,739 Interest expense (13,872 ) (13,866 ) (41,610 ) (41,591 ) Other expense, net (1,024 ) (3,827 ) (2,588 ) (11,941 ) $ (392 ) $ (5,053 ) $ (6,130 ) $ (24,793 )

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Loss Comprehensive income (loss) is defined as the change in equity of a company during a period from transactions and other events and circumstances from non-owner sources. The components of accumulated other comprehensive loss are as follows: (In thousands) December 31, 2016 April 2, 2016 Accumulated unrealized losses on available-for-sale securities, net of tax $ (19,646 ) $ (1,260 ) Accumulated unrealized gains (losses) on hedging transactions, net of tax (1,973 ) 256 Accumulated cumulative translation adjustment, net of tax (8,822 ) (5,627 ) Accumulated other comprehensive loss $ (30,441 ) $ (6,631 ) The related tax effects of other comprehensive loss were not material for all periods presented.

Income Taxes

Income Taxes	9 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded tax provisions of $20.7 million and $50.8 million for the third quarter and the first nine months of fiscal 2017 , respectively, representing an effective tax rate of 13% and 10% , respectively. The Company recorded tax provisions of $24.2 million and $61.2 million for the third quarter and the first nine months of fiscal 2016 , respectively, representing an effective tax rate of 16% and 13% , respectively. The difference between the U.S. federal statutory tax rate of 35% and the Company’s effective tax rate in all periods is primarily due to income earned in lower tax rate jurisdictions, for which no U.S. income tax has been provided, as the Company intends to permanently reinvest these earnings outside of the U.S. The Company’s total gross unrecognized tax benefits as of December 31, 2016 , determined in accordance with FASB authoritative guidance for measuring uncertain tax positions, increased by $289 thousand in the third quarter of fiscal 2017 to $26.3 million . The total amount of unrecognized tax benefits that, if realized in a future period, would favorably affect the effective tax rate was $7.6 million as of December 31, 2016 . The Company’s policy is to include interest and penalties related to income tax liabilities within the provision for income taxes on the condensed consolidated statements of income. The balance of accrued interest and penalties recorded in the condensed consolidated balance sheets and the amounts of interest and penalties included in the Company's provision for income taxes were not material for all periods presented. The Company is no longer subject to U.S. federal audits by taxing authorities for years through fiscal 2011, U.S. state audits for years through fiscal 2010 and tax audits in Ireland for years through fiscal 2012. The Company had been subject to examination by the IRS for fiscal years 2012 through 2014. During the fourth quarter of fiscal 2016, the IRS completed its fieldwork and issued a Revenue Agent Report. The case was then moved forward to the Joint Committee on Taxation for review. On July 29, 2016, the Company received written notification that the Joint Committee had completed its review and had taken no exception to the conclusions reached by the IRS. As a result of the early adoption of new guidance on accounting for share-based payments, the Company recorded excess tax benefits of $1.2 million and $10.9 million for the third quarter and first nine months of fiscal 2017 , respectively, in the condensed consolidated statement of income as a component of the provision for income taxes. Please refer to "Note 2. Recent Accounting Changes and Accounting Pronouncements" for more details regarding the adoption of the new guidance.

Commitments

Commitments	9 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments Xilinx leases some of its facilities and office buildings under non-cancelable operating leases that expire at various dates through December 2025 . Additionally, Xilinx entered into a land lease in conjunction with the Company’s building in Singapore, which will expire in November 2035 and the lease cost was settled in an up-front payment in June 2006. Some of the operating leases for facilities and office buildings require payment of operating costs, including property taxes, repairs, maintenance and insurance. Most of the Company’s leases contain renewal options for varying terms. Approximate future minimum lease payments under non-cancelable operating leases are as follows: Fiscal (In thousands) 2017 (remaining three months) $ 1,640 2018 5,591 2019 4,358 2020 3,311 2021 2,292 Thereafter 1,774 Total $ 18,966 Aggregate future rental income to be received from owned property totaled $2.2 million as of December 31, 2016 . Rent expense, net of rental income, under all operating leases was $1.3 million and $3.8 million for the three and nine months ended December 31, 2016 , respectively. Rent expense, net of rental income, under all operating leases was $1.2 million and $3.3 million for the three and nine months ended January 2, 2016 , respectively. Rental income was not material for the third quarter and the first nine months of fiscal 2017 and 2016 . Other commitments as of December 31, 2016 totaled $143.7 million and consisted of purchases of inventory and other non-cancelable purchase obligations related to subcontractors that manufacture silicon wafers and provide assembly and test services. The Company expects to receive and pay for these materials and services in the next three to six months, as the products meet delivery and quality specifications. As of December 31, 2016 , the Company had $55.7 million of non-cancelable license obligations to providers of electronic design automation software and hardware/software maintenance expiring at various dates through December 2019 .

Product Warranty and Indemnific

Product Warranty and Indemnification	9 Months Ended
	Dec. 31, 2016
Product Warranties Disclosures [Abstract]
Product Warranty Disclosure [Text Block]	Product Warranty and Indemnification The Company generally sells products with a limited warranty for product quality. The Company provides an accrual for known product issues if a loss is probable and can be reasonably estimated. As of the end of the third quarter of fiscal 2017 and the end of fiscal 2016 , the accrual balance of the product warranty liability was immaterial. The Company offers, subject to certain terms and conditions, to indemnify customers and distributors for costs and damages awarded against these parties in the event the Company’s hardware products are found to infringe third-party intellectual property rights, including patents, copyrights or trademarks, and to compensate certain customers for limited specified costs they actually incur in the event our hardware products experience epidemic failure. To a lesser extent, the Company may from time-to-time offer limited indemnification with respect to its software products. The terms and conditions of these indemnity obligations are limited by contract, which obligations are typically perpetual from the effective date of the agreement. The Company has historically received only a limited number of requests for indemnification under these provisions and has not made any significant payments pursuant to these provisions. The Company cannot estimate the maximum amount of potential future payments, if any, that the Company may be required to make as a result of these obligations due to the limited history of indemnification claims and the unique facts and circumstances that are likely to be involved in each particular claim and indemnification provision. However, there can be no assurances that the Company will not incur any financial liabilities in the future as a result of these obligations.

Contingencies

Contingencies	9 Months Ended
	Dec. 31, 2016
Loss Contingency [Abstract]
Contingencies	Contingencies Patent Litigation On November 7, 2014, the Company filed a complaint for declaratory judgment against Papst Licensing GmbH & Co., KG (Papst) in the U.S. District Court for the Northern District of California (Xilinx, Inc. v. Papst Licensing GmbH & Co., KG, Case No. 3:14-CV-04963) (the California Action). On the same date, a patent infringement lawsuit was filed by Papst against the Company in the U.S. District Court for the District of Delaware (Papst Licensing GmbH & Co., KG v. Xilinx, Inc., Case No. 1:14-CV-01376) (the Delaware Action). Both the California Action and the Delaware Action pertain to the same two patents. In the Delaware Action, Papst seeks unspecified damages, interest and costs. On July 9, 2015, the Court in the California Action granted Papst's motion to dismiss for lack of personal jurisdiction, and the California Action was dismissed. The Company has appealed the decision dismissing in the California Action. On September 1, 2015, the Court in the Delaware Action granted the Company's motion to transfer the Delaware Action to the U.S. District Court for the Northern District of California (Papst Licensing GmbH & Co., KG v. Xilinx, Inc., Case No. 3:16-cv-00925-EDL). On June 9, 2016, the Court in the transferred Delaware Action granted the Company’s motion for judgment on the pleadings, determining that each of the asserted claims is directed to a patent-ineligible abstract idea and dismissing Papst’s claims for infringement. On July 8, 2016, Papst filed a notice of appeal from the judgment in favor of the Company. The Company is unable to estimate is range of possible loss, if any, in this matter at this time. On July 17, 2014, a patent infringement lawsuit was filed by PLL Technologies, Inc. (PTI) against the Company in the U.S. District Court for the District of Delaware (PLL Technologies, Inc. v. Xilinx, Inc., Case No. 1:14-CV-00945). On April 28, 2015, the United States Patent Trial and Appeal Board (PTAB) granted Xilinx's request for inter partes review (IPR) with respect to all claims in the litigation. On May 5, 2015, the Court ordered the litigation be stayed pending final resolution of the IPR. On April 18, 2016, the PTAB issued a final written decision in which all of the asserted claims were found unpatentable. On June 14, 2016, PTI filed notice of appeal from the final written decision. The lawsuit pertains to one patent and PTI seeks unspecified damages, interest and costs. The Company is unable to estimate its range of possible loss, if any, in this matter at this time. On October 6, 2016, a patent infringement lawsuit was filed by Marking Object Virtualization Intelligence, LLC (“MOVI”) against the Company in the U.S. District Court for the Eastern District of Texas (Marking Object Virtualization Intelligence, LLC v. Xilinx, Inc., Case No. 2:16-cv-01109-JRG). The lawsuit pertained to two patents, and was dismissed with prejudice on January 9, 2017. The Company intends to continue to protect and defend our IP vigorously. Other Matters On June 11, 2015, John P. Neblett, as Chapter 7 Trustee of Valley Forge Composite Technologies, Inc., filed a complaint against Xilinx and others in the U.S. Bankruptcy Court for the Middle District of Pennsylvania (Bankruptcy No. 1:13-bk-05253-JJT). The complaint alleges causes of actions against Xilinx for negligence and civil conspiracy relating to alleged violations of U.S. export laws. It seeks at least $50.0 million in damages, together with punitive damages, from the defendants. On September 21, 2015, the action was withdrawn from the U.S. Bankruptcy Court for the Middle District of Pennsylvania and transferred to the U.S. District Court for the Eastern District of Kentucky. On November 2, 2015, Xilinx, along with other defendants, filed a motion to dismiss the complaint. On November 3, 2015, Xilinx filed a motion for sanctions pursuant to Federal Rule of Civil Procedure 11. On June 27, 2016, the Court denied both motions. The Company intends to vigorously defend the case and is unable to estimate its range of possible loss, if any, in this matter at this time. From time to time, the Company is involved in various disputes and litigation matters that arise in the ordinary course of its business. These include disputes and lawsuits related to intellectual property, mergers and acquisitions, licensing, contract law, tax, regulatory, distribution arrangements, employee relations and other matters. Periodically, the Company reviews the status of each matter and assesses its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and a range of possible losses can be estimated, the Company accrues a liability for the estimated loss. Legal proceedings are subject to uncertainties, and the outcomes are difficult to predict. Because of such uncertainties, accruals are based only on the best information available at the time. As additional information becomes available, the Company continues to reassess the potential liability related to pending claims and litigation and may revise estimates.

Goodwill and Acquisition-Relate

Goodwill and Acquisition-Related Intangibles	9 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquisition-Related Intangibles	Goodwill and Acquisition-Related Intangibles As of December 31, 2016 and April 2, 2016 , the amount of goodwill and the gross and net amounts of acquisition-related intangibles for all acquisitions were as follows: Weighted-Average (In thousands) December 31, 2016 April 2, 2016 Amortization Life Goodwill $ 161,287 $ 159,296 Core technology, gross 79,980 77,640 5.6 years Less accumulated amortization (75,348 ) (71,472 ) Core technology, net 4,632 6,168 Other intangibles, gross 46,766 46,606 2.6 years Less accumulated amortization (46,639 ) (46,572 ) Other intangibles, net 127 34 Total acquisition-related intangibles, gross 126,746 124,246 Less accumulated amortization (121,987 ) (118,044 ) Total acquisition-related intangibles, net $ 4,759 $ 6,202 Amortization expense for acquisition-related intangibles for the three and nine months ended December 31, 2016 was $1.5 million and $3.9 million , respectively. Based on the carrying value of acquisition-related intangibles recorded as of December 31, 2016 , and assuming no subsequent impairment of the underlying assets, the annual amortization expense for acquisition-related intangibles is expected to be as follows: Fiscal (In thousands) 2017 (remaining three months) $ 1,184 2018 1,922 2019 561 2020 468 2021 468 Thereafter 156 Total $ 4,759

Business Combination (Notes)

Business Combination (Notes)	9 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	Business Combination During the second quarter of fiscal 2017, the Company completed the acquisition of Auviz Systems Inc., an independent software vendor that accelerates algorithms for data center and embedded devices. This acquisition aligns with the Company's strategy for accelerating vertical market growth and meets the increasing demand from customers for data libraries. This acquisition was accounted for under the purchase method of accounting. The aggregate financial impact of this acquisition was not material to the Company.

Subsequent Events (Notes)

Subsequent Events (Notes)	9 Months Ended
	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events On January 24, 2017 , the Company’s Board of Directors declared a cash dividend of $0.33 per common share for the fourth quarter of fiscal 2017 . The dividend is payable on February 23, 2017 to stockholders of record on February 8, 2017 .

Derivative Financial Instrume27

Derivative Financial Instruments Derivative Financial Instruments (Policies)	9 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Derivatives, Policy [Policy Text Block]	Gains and losses on foreign currency forward contracts that are designated as hedges of anticipated transactions, for which a firm commitment has been attained and the hedged relationship has been effective, are deferred and included in income or expenses in the same period that the underlying transaction is settled. Gains and losses on any instruments not meeting the above criteria are recognized in income or expenses in the consolidated statements of income as they are incurred.

Stock-Based Compensation Plans

Stock-Based Compensation Plans (Policies)	9 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Share based compensation, Restricted Stock and Restricted Stock Units Policy [Policy Text Block]	The estimated fair values of RSU awards were calculated based on the market price of Xilinx common stock on the date of grant, reduced by the present value of dividends expected to be paid on Xilinx common stock prior to vesting.

Inventories Inventories (Polici

Inventories Inventories (Policies)	9 Months Ended
	Dec. 31, 2016
Inventory Disclosure [Abstract]
Inventory, Policy [Policy Text Block]	Inventories are stated at the lower of actual cost (determined using the first-in, first-out method) or market (estimated net realizable value)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Assets and liabilities measured at fair value on a recurring basis	The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31, 2016 and April 2, 2016 : December 31, 2016 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 366,460 $ — $ — $ 366,460 Financial institution securities — 299,875 — 299,875 Non-financial institution securities — 22,689 — 22,689 U.S. government and agency securities 24,990 58,282 — 83,272 Foreign government and agency securities — 4,998 — 4,998 Short-term investments: Financial institution securities — 174,997 — 174,997 Non-financial institution securities — 272,956 — 272,956 Municipal bonds — 50,067 — 50,067 U.S. government and agency securities 29,607 63,569 — 93,176 Foreign government and agency securities — 89,752 — 89,752 Asset-backed securities — 210,465 — 210,465 Mortgage-backed securities — 1,141,926 — 1,141,926 Debt mutual funds — 33,952 — 33,952 Bank loans — 131,056 — 131,056 Commercial mortgage-backed securities — 216,242 — 216,242 Long-term investments: Auction rate securities — — 10,227 10,227 Asset-backed securities — 5,388 — 5,388 Municipal bonds — 4,726 — 4,726 Mortgage-backed securities — 110,758 — 110,758 Debt mutual fund — 51,983 — 51,983 Total assets measured at fair value $ 421,057 $ 2,943,681 $ 10,227 $ 3,374,965 Liabilities Derivative financial instruments, net $ — $ 1,753 $ — $ 1,753 Total liabilities measured at fair value $ — $ 1,753 $ — $ 1,753 Net assets measured at fair value $ 421,057 $ 2,941,928 $ 10,227 $ 3,373,212 April 2, 2016 (In thousands) Quoted Significant Significant Total Fair Assets Cash equivalents: Money market funds $ 232,698 $ — $ — $ 232,698 Non-financial institution securities — 104,964 — 104,964 Foreign government and agency securities — 98,967 — 98,967 Municipal bonds — 1,003 — 1,003 Short-term investments: Financial institution securities — 284,853 — 284,853 Non-financial institution securities — 460,148 — 460,148 Municipal Bonds — 61,579 — 61,579 U.S. government and agency securities 81,873 110,420 — 192,293 Foreign government and agency securities — 214,201 — 214,201 Mortgage-backed securities — 1,067,157 — 1,067,157 Debt mutual fund — 35,116 — 35,116 Bank loans — 102,015 — 102,015 Asset-backed securities — 210,051 — 210,051 Commercial mortgage-backed securities — 206,470 — 206,470 Long-term investments: Auction rate securities — — 9,977 9,977 Municipal bonds — 7,100 — 7,100 Mortgage-backed securities — 140,382 — 140,382 Debt mutual fund — 56,785 — 56,785 Asset-backed securities — 6,563 — 6,563 Derivative financial instruments, net — 744 — 744 Total assets measured at fair value $ 314,571 $ 3,168,518 $ 9,977 $ 3,493,066
Changes in Level 3 instruments measured at fair value on a recurring basis	The following table is a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3): Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Balance as of beginning of period $ 10,160 $ 10,413 $ 9,977 $ 10,312 Total unrealized gains (losses): Included in other comprehensive income (loss) 67 (302 ) 250 (201 ) Balance as of end of period $ 10,227 $ 10,111 $ 10,227 $ 10,111

Financial Instruments (Tables)

Financial Instruments (Tables)	9 Months Ended
	Dec. 31, 2016
Investments, All Other Investments [Abstract]
Available-for-sale securities	The following is a summary of cash equivalents and available-for-sale securities as of the end of the periods presented: December 31, 2016 April 2, 2016 (In thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Money market funds $ 366,460 $ — $ — $ 366,460 $ 232,698 $ — $ — $ 232,698 Financial institution securities 474,872 — — 474,872 284,853 — — 284,853 Non-financial institution securities 295,848 541 (744 ) 295,645 564,480 862 (230 ) 565,112 Auction rate securities 10,500 — (273 ) 10,227 10,500 — (523 ) 9,977 Municipal bonds 55,028 331 (566 ) 54,793 68,938 877 (133 ) 69,682 U.S. government and agency securities 176,583 7 (142 ) 176,448 192,291 73 (71 ) 192,293 Foreign government and agency securities 94,783 — (33 ) 94,750 313,168 — — 313,168 Mortgage-backed securities 1,264,983 5,906 (18,205 ) 1,252,684 1,200,071 12,848 (5,380 ) 1,207,539 Asset-backed securities 215,879 677 (703 ) 215,853 216,068 1,151 (605 ) 216,614 Debt mutual funds 101,350 — (15,415 ) 85,935 101,350 — (9,449 ) 91,901 Bank loans 130,029 1,102 (75 ) 131,056 102,092 25 (102 ) 102,015 Commercial mortgage- backed securities 219,675 128 (3,561 ) 216,242 207,847 432 (1,809 ) 206,470 $ 3,405,990 $ 8,692 $ (39,717 ) $ 3,374,965 $ 3,494,356 $ 16,268 $ (18,302 ) $ 3,492,322
Fair values and gross unrealized losses of the investments	The following tables show the fair values and gross unrealized losses of the Company’s investments, aggregated by investment category, for individual securities that have been in a continuous unrealized loss position for the length of time specified, as of December 31, 2016 and April 2, 2016 : December 31, 2016 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 69,567 $ (733 ) $ 1,523 $ (11 ) $ 71,090 $ (744 ) Auction rate securities — — 10,227 (273 ) 10,227 (273 ) Municipal bonds 32,671 (537 ) 1,730 (29 ) 34,401 (566 ) U.S. government and agency securities 82,785 (142 ) — — 82,785 (142 ) Foreign government and agency securities 14,976 (33 ) — — 14,976 (33 ) Mortgage-backed securities 914,938 (15,537 ) 118,236 (2,668 ) 1,033,174 (18,205 ) Asset-backed securities 87,937 (561 ) 11,380 (142 ) 99,317 (703 ) Debt mutual funds — — 85,935 (15,415 ) 85,935 (15,415 ) Bank loans 12,264 (75 ) — — 12,264 (75 ) Commercial mortgage- backed securities 151,331 (1,984 ) 24,384 (1,577 ) 175,715 (3,561 ) $ 1,366,469 $ (19,602 ) $ 253,415 $ (20,115 ) $ 1,619,884 $ (39,717 ) April 2, 2016 Less Than 12 Months 12 Months or Greater Total (In thousands) Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Non-financial institution securities $ 52,756 $ (230 ) $ — $ — $ 52,756 $ (230 ) Auction rate securities — — 9,977 (523 ) 9,977 (523 ) Municipal bonds 10,138 (44 ) 3,867 (89 ) 14,005 (133 ) U.S. government and agency securities 84,024 (71 ) — — 84,024 (71 ) Mortgage-backed securities 346,560 (3,916 ) 114,285 (1,464 ) 460,845 (5,380 ) Asset-backed securities 81,038 (502 ) 20,793 (103 ) 101,831 (605 ) Debt mutual funds — — 91,901 (9,449 ) 91,901 (9,449 ) Bank loans 34,358 (31 ) 42,832 (71 ) 77,190 (102 ) Commercial mortgage- backed securities 141,761 (878 ) 2,150 (931 ) 143,911 (1,809 ) $ 750,635 $ (5,672 ) $ 285,805 $ (12,630 ) $ 1,036,440 $ (18,302 )
Amortized cost and estimated fair value of marketable debt securities	The amortized cost and estimated fair value of marketable debt securities (financial institution securities, non-financial institution securities, auction rate securities, municipal bonds, U.S. and foreign government and agency securities, mortgage-backed securities, asset-backed securities, bank loans and commercial mortgage-backed securities), by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties. December 31, 2016 (In thousands) Amortized Estimated Due in one year or less $ 839,365 $ 839,380 Due after one year through five years 496,399 494,352 Due after five years through ten years 243,772 243,648 Due after ten years 1,358,644 1,345,190 $ 2,938,180 $ 2,922,570
Information on sale of available-for-sale securities	Certain information related to available-for-sale securities is as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Proceeds from sale of available-for-sale securities $ 130,891 $ 82,396 $ 384,236 $ 203,426 Gross realized gains on sale of available-for-sale securities $ 624 $ 203 $ 2,055 $ 1,038 Gross realized losses on sale of available-for-sale securities (679 ) (221 ) (1,284 ) (439 ) Net realized gains (losses) on sale of available-for-sale securities $ (55 ) $ (18 ) $ 771 $ 599 Amortization of premiums on available-for-sale securities $ 8,034 $ 6,906 $ 22,209 $ 20,417

Derivative Financial Instrume32

Derivative Financial Instruments (Tables)	9 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Forward currency exchange contracts outstanding	As of December 31, 2016 and April 2, 2016 , the Company had the following outstanding forward currency exchange contracts (in notional amount), which were derivative financial instruments: (In thousands and U.S. dollars) December 31, 2016 April 2, 2016 Singapore Dollar $ 21,448 $ 26,978 Euro 18,436 19,123 Indian Rupee 34,606 23,302 British Pound 8,429 10,716 Japanese Yen 3,834 3,387 $ 86,753 $ 83,506
Derivative Instruments Located on Condensed Consolidated Balance Sheet	The Company had the following derivative instruments as of December 31, 2016 and April 2, 2016 , located on the condensed consolidated balance sheet, utilized for risk management purposes detailed above: Foreign Exchange Contracts Asset Derivatives Liability Derivatives (In thousands) Balance Sheet Location Fair Value Balance Sheet Location Fair Value December 31, 2016 Prepaid expenses and other current assets $ 380 Other accrued liabilities $ 2,133 April 2, 2016 Prepaid expenses and other current assets $ 2,161 Other accrued liabilities $ 1,417
Effect Of Derivative Instruments On Condensed Consolidated Statements Of Income	The following table summarizes the effect of derivative instruments on the condensed consolidated statements of income for the third quarter and the first nine months of fiscal 2017 and 2016 : Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Amount of losses recognized in other comprehensive income on derivative (effective portion of cash flow hedging) $ (2,185 ) $ (1,470 ) $ (2,229 ) $ (5,035 ) Amount of losses reclassified from accumulated other comprehensive income into income (effective portion) * $ (875 ) $ (2,166 ) $ (1,513 ) $ (6,110 ) Amount of gains (losses) recorded (ineffective portion) * $ 23 $ 7 $ 31 $ (15 ) * Recorded in Interest and Other Expense, net within the condensed consolidated statements of income.

Stock-Based Compensation Plan33

Stock-Based Compensation Plans (Tables)	9 Months Ended
	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-Based compensation expense	The following table summarizes stock-based compensation expense related to stock awards granted under the Company’s equity incentive plans and rights to acquire stock granted under the Company’s Employee Stock Purchase Plan (ESPP): Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Stock-based compensation included in: Cost of revenues $ 1,945 $ 2,145 $ 5,994 $ 5,872 Research and development 17,154 16,935 48,803 44,561 Selling, general and administrative 11,768 12,383 35,276 34,031 $ 30,867 $ 31,463 $ 90,073 $ 84,464
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	The per share weighted-average fair value of RSUs granted during the third quarter of fiscal 2017 was $49.50 ( $43.41 for the third quarter of fiscal 2016 ), and for the first nine months of fiscal 2017 was $43.40 ( $41.24 for the first nine months of fiscal 2016 ), which were calculated based on estimates at the date of grant using the following weighted-average assumptions: Three Months Ended Nine Months Ended December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Risk-free interest rate 1.4 % 1.3 % 0.9 % 1.3 % Dividend yield 2.5 % 2.7 % 2.8 % 2.8 %
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]	The fair values of stock purchase plan rights granted in the second quarter of fiscal 2017 and 2016 were estimated using the Black-Scholes option pricing model at the date of grant using the following assumptions: 2017 2016 Expected life of options (years) 1.25 1.25 Expected stock price volatility 0.23 0.25 Risk-free interest rate 0.5 % 0.4 % Dividend yield 2.6 % 3.0 %
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of option plans activity	A summary of the Company’s option plans activity and related information is as follows: Options Outstanding (Shares in thousands) Number of Shares Weighted-Average Exercise Price Per Share April 2, 2016 1,257 $ 25.42 Exercised (1,010 ) $ 24.78 Forfeited/cancelled/expired (3 ) $ 26.21 December 31, 2016 244 $ 28.03 Options exercisable at: December 31, 2016 243 $ 28.01 April 2, 2016 1,241 $ 25.33
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of restricted stock unit activity and related information	A summary of the Company’s RSU activity and related information is as follows: RSUs Outstanding (Shares in thousands) Number of Shares Weighted-Average Grant-Date Fair Value Per Share April 2, 2016 6,678 $ 40.74 Granted 3,130 $ 43.40 Vested (2,269 ) $ 39.49 Cancelled (412 ) $ 41.15 December 31, 2016 7,127 $ 42.27

Net Income Per Common Share Net

Net Income Per Common Share Net Income Per Common Share (Tables)	9 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table summarizes the computation of basic and diluted net income per common share: Three Months Ended Nine Months Ended (In thousands, except per share amounts) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Net income available to common stockholders $ 141,846 $ 130,819 $ 469,087 $ 405,833 Weighted average common shares outstanding-basic 250,982 256,450 252,811 257,491 Dilutive effect of employee equity incentive plans 2,907 2,538 2,400 2,416 Dilutive effect of 2017 Convertible Notes [1] 10,165 8,067 9,212 7,303 Dilutive effect of warrants 6,727 2,556 4,759 1,506 Weighted average common shares outstanding-diluted 270,781 269,611 269,182 268,716 Basic earnings per common share $ 0.57 $ 0.51 $ 1.86 $ 1.58 Diluted earnings per common share $ 0.52 $ 0.49 $ 1.74 $ 1.51

Inventories Inventories (Tables

Inventories Inventories (Tables)	9 Months Ended
	Dec. 31, 2016
Inventory Disclosure [Abstract]
Schedule of Inventory, Current [Table Text Block]	Inventories are stated at the lower of actual cost (determined using the first-in, first-out method) or market (estimated net realizable value) and are comprised of the following: (In thousands) December 31, 2016 April 2, 2016 Raw materials $ 15,354 $ 15,346 Work-in-process 147,650 123,675 Finished goods 42,923 39,529 $ 205,927 $ 178,550

Debt and Credit Facility (Table

Debt and Credit Facility (Tables)	9 Months Ended
	Dec. 31, 2016
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Schedule of Debt Instruments [Line Items]
Carrying values of liability and equity components of debentures	The carrying values of the liability and equity components of the 2017 Convertible Notes are reflected in the Company’s condensed consolidated balance sheets as follows: (In thousands) December 31, 2016 April 2, 2016 Liability component: Principal amount of the 2017 Convertible Notes (discount is based on imputed discount rate of 5.75%) $ 600,000 $ 600,000 Unamortized discount of liability component (6,477 ) (18,135 ) Hedge accounting adjustment – sale of interest rate swap 1,872 5,241 Unamortized debt issuance costs associated with 2017 Convertible Notes (603 ) (1,689 ) Net carrying value of the 2017 Convertible Notes $ 594,792 $ 585,417 Equity component (including temporary equity) – net carrying value $ 66,415 $ 66,415
Interest Expense Related to Debentures [Table Text Block]	Interest expense related to the 2017 Convertible Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Contractual coupon interest $ 3,938 $ 3,938 $ 11,813 $ 11,813 Amortization of debt issuance costs 362 362 1,086 1,086 Amortization of debt discount, net 2,763 2,763 8,289 8,289 Total interest expense related to the 2017 Convertible Notes $ 7,063 $ 7,063 $ 21,188 $ 21,188
2019 and 2021 Notes Payable [Member]
Schedule of Debt Instruments [Line Items]
Schedule of Long-term Debt Instruments [Table Text Block]	The following table summarizes the carrying value of the 2019 and 2021 Notes as of December 31, 2016 and April 2, 2016 : (In thousands) December 31, 2016 April 2, 2016 Principal amount of the 2019 Notes (discount is based on imputed interest rate of 2.236%) $ 500,000 $ 500,000 Unamortized discount of the 2019 Notes (1,169 ) (1,560 ) Unamortized debt issuance costs associated with the 2019 Notes (740 ) (996 ) Principal amount of the 2021 Notes (discount is based on imputed interest rate of 3.115%) 500,000 500,000 Unamortized discount of the 2021 Notes (2,233 ) (2,605 ) Unamortized debt issuance costs associated with the 2021 Notes (1,016 ) (1,200 ) Total carrying value $ 994,842 $ 993,639
Interest Expense Related to Debentures [Table Text Block]	Interest expense related to the 2019 and 2021 Notes was included in interest and other expense, net on the condensed consolidated statements of income as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Contractual coupon interest $ 6,406 $ 6,406 $ 19,219 $ 19,219 Amortization of debt issuance costs 146 146 439 439 Amortization of debt discount, net 257 251 764 745 Total interest expense related to the 2019 and 2021 Notes $ 6,809 $ 6,803 $ 20,422 $ 20,403

Interest And Other Expense, N37

Interest And Other Expense, Net (Tables)	9 Months Ended
	Dec. 31, 2016
Other Income and Expenses [Abstract]
Components of interest and other expense, net	The components of interest and other expense, net are as follows: Three Months Ended Nine Months Ended (In thousands) December 31, 2016 January 2, 2016 December 31, 2016 January 2, 2016 Interest income $ 14,504 $ 12,640 $ 38,068 $ 28,739 Interest expense (13,872 ) (13,866 ) (41,610 ) (41,591 ) Other expense, net (1,024 ) (3,827 ) (2,588 ) (11,941 ) $ (392 ) $ (5,053 ) $ (6,130 ) $ (24,793 )

Accumulated Other Comprehensi38

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Components of accumulated other comprehensive income (loss)	The components of accumulated other comprehensive loss are as follows: (In thousands) December 31, 2016 April 2, 2016 Accumulated unrealized losses on available-for-sale securities, net of tax $ (19,646 ) $ (1,260 ) Accumulated unrealized gains (losses) on hedging transactions, net of tax (1,973 ) 256 Accumulated cumulative translation adjustment, net of tax (8,822 ) (5,627 ) Accumulated other comprehensive loss $ (30,441 ) $ (6,631 )

Commitments (Tables)

Commitments (Tables)	9 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Future minimum lease payments under non-cancelable operating leases	Approximate future minimum lease payments under non-cancelable operating leases are as follows: Fiscal (In thousands) 2017 (remaining three months) $ 1,640 2018 5,591 2019 4,358 2020 3,311 2021 2,292 Thereafter 1,774 Total $ 18,966

Goodwill and Acquisition-Rela40

Goodwill and Acquisition-Related Intangibles (Tables)	9 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Gross and net amounts of goodwill and of acquisition-related intangibles	As of December 31, 2016 and April 2, 2016 , the amount of goodwill and the gross and net amounts of acquisition-related intangibles for all acquisitions were as follows: Weighted-Average (In thousands) December 31, 2016 April 2, 2016 Amortization Life Goodwill $ 161,287 $ 159,296 Core technology, gross 79,980 77,640 5.6 years Less accumulated amortization (75,348 ) (71,472 ) Core technology, net 4,632 6,168 Other intangibles, gross 46,766 46,606 2.6 years Less accumulated amortization (46,639 ) (46,572 ) Other intangibles, net 127 34 Total acquisition-related intangibles, gross 126,746 124,246 Less accumulated amortization (121,987 ) (118,044 ) Total acquisition-related intangibles, net $ 4,759 $ 6,202
Schedule of expected annual amortization expense for acquisition-related intangibles	Based on the carrying value of acquisition-related intangibles recorded as of December 31, 2016 , and assuming no subsequent impairment of the underlying assets, the annual amortization expense for acquisition-related intangibles is expected to be as follows: Fiscal (In thousands) 2017 (remaining three months) $ 1,184 2018 1,922 2019 561 2020 468 2021 468 Thereafter 156 Total $ 4,759

Recent Accounting Changes and41

Recent Accounting Changes and Accounting Pronouncements Change in accounting Policy - retrospective restatement (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Jan. 02, 2016
Statement of Cash Flows [Abstract]
Excess Tax Benefit from Share-based Compensation, Operating Activities			$ 12.3
Excess Tax Benefit from Share-based Compensation, Financing Activities			$ 12.3
Effective Income Tax Rate Reconciliation, Excess Tax Benefit, Share-based Compensation, Amount	$ 1.2	$ 10.9

Recent Accounting Changes and42

Recent Accounting Changes and Accounting Pronouncements Change in Accounting Policy- Diluted EPS Impact (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2016
Accounting Policies [Abstract]
Effective Income Tax Rate Reconciliation, Excess Tax Benefit, Share-based Compensation, Amount	$ 1.2	$ 10.9
DilutedEarningsPerShareIncrease,ExcessTaxBenefit,Share-basedCompensation	$ 0	$ 0.04

Significant Customers and Con43

Significant Customers and Concentrations of Credit Risk (Details) - Customer	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016	Apr. 02, 2016
Significant Customers and Concentrations of Credit Risk [Abstract]
Percentage of Accounts Receivable Accounted From Company Distributor One	60.00%		60.00%		75.00%
Percentage of net revenues through resale of product from Company Distributor One	45.00%	49.00%	43.00%	50.00%
Number of End Customers Accounted For 10% or More of Net Revenues	0	0	0	0
Percentage of higher grade securities investment in debt securities	86.00%		86.00%
Percentage of Mortgage Backed Securities In Investment Portfolio	37.00%		37.00%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016	Oct. 01, 2016	Apr. 02, 2016	Sep. 26, 2015	Mar. 28, 2015
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 10,227	$ 10,111	$ 10,227	$ 10,111	$ 10,160	$ 9,977	$ 10,413	$ 10,312
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	67	$ (302)	250	$ (201)
Fair Value, Measurements, Recurring [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	3,374,965		3,374,965			3,493,066
Liabilities, Fair Value Disclosure, Recurring	1,753		1,753
Fair Value, Net Asset (Liability)	3,373,212		3,373,212
Fair Value, Measurements, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Liabilities, Fair Value Disclosure, Recurring	1,753		1,753
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	421,057		421,057			314,571
Liabilities, Fair Value Disclosure, Recurring	0		0
Fair Value, Net Asset (Liability)	421,057		421,057
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Liabilities, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	2,943,681		2,943,681			3,168,518
Liabilities, Fair Value Disclosure, Recurring	1,753		1,753
Fair Value, Net Asset (Liability)	2,941,928		2,941,928
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Liabilities, Fair Value Disclosure, Recurring	1,753		1,753
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	10,227		10,227			9,977
Liabilities, Fair Value Disclosure, Recurring	0		0
Fair Value, Net Asset (Liability)	10,227		10,227
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Liabilities, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	366,460		366,460			232,698
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	299,875		299,875
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	22,689		22,689			104,964
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						1,003
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	83,272		83,272
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	4,998		4,998			98,967
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	366,460		366,460			232,698
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	24,990		24,990
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	299,875		299,875
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	22,689		22,689			104,964
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						1,003
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	58,282		58,282
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	4,998		4,998			98,967
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0
Fair Value, Measurements, Recurring [Member] | Cash And Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	174,997		174,997			284,853
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	272,956		272,956			460,148
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	50,067		50,067			61,579
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	93,176		93,176			192,293
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	89,752		89,752			214,201
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	210,465		210,465			210,051
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	1,141,926		1,141,926			1,067,157
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	33,952		33,952			35,116
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	131,056		131,056			102,015
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	216,242		216,242			206,470
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	29,607		29,607			81,873
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	174,997		174,997			284,853
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	272,956		272,956			460,148
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	50,067		50,067			61,579
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	63,569		63,569			110,420
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	89,752		89,752			214,201
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	210,465		210,465			210,051
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	1,141,926		1,141,926			1,067,157
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	33,952		33,952			35,116
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	131,056		131,056			102,015
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	216,242		216,242			206,470
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Non-financial institution securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | U.S. Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government and Agency Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Bank Loans [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Short-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	10,227		10,227			9,977
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	4,726		4,726			7,100
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	5,388		5,388			6,563
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	110,758		110,758			140,382
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	51,983		51,983			56,785
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Derivative Financial Instruments, Assets [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						744
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Assets [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	4,726		4,726			7,100
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	5,388		5,388			6,563
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	110,758		110,758			140,382
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	51,983		51,983			56,785
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						744
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	10,227		10,227			9,977
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Securities [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	0		0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Mutual Fund [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring	$ 0		$ 0			0
Fair Value, Measurements, Recurring [Member] | Long-Term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Assets [Member]
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets, Fair Value Disclosure, Recurring						$ 0

Fair Value Measurements (Deta45

Fair Value Measurements (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Changes in Level 3 instruments measured at fair value on a recurring basis
Balance as of beginning of period	$ 10,160	$ 10,413	$ 9,977	$ 10,312
Total realized and unrealized gains (losses) included in other comprehensive income	67	(302)	250	(201)
Balance as of end of period	$ 10,227	$ 10,111	$ 10,227	$ 10,111

Fair Value Measurements (Deta46

Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 3,374,965	$ 3,492,322
Senior Notes [Member] | 2.125% 2019 Senior Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debentures	500,800
Senior Notes [Member] | 3.0% 2021 Senior Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debentures	506,000
Convertible Notes [Member] | Two And Six Two Five Percent Senior Convertible Debentures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of debentures	$ 1,250,000

Financial Instruments (Details)

Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Available-for-sale securities
Amortized Cost	$ 3,405,990	$ 3,494,356
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	8,692	16,268
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(39,717)	(18,302)
Estimated Fair Value	3,374,965	3,492,322
Money Market Funds [Member]
Available-for-sale securities
Amortized Cost	366,460	232,698
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Estimated Fair Value	366,460	232,698
Financial institution securities [Member]
Available-for-sale securities
Amortized Cost	474,872	284,853
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Estimated Fair Value	474,872	284,853
Non-financial institution securities [Member]
Available-for-sale securities
Amortized Cost	295,848	564,480
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	541	862
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(744)	(230)
Estimated Fair Value	295,645	565,112
Auction Rate Securities [Member]
Available-for-sale securities
Amortized Cost	10,500	10,500
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(273)	(523)
Estimated Fair Value	10,227	9,977
Municipal Bonds [Member]
Available-for-sale securities
Amortized Cost	55,028	68,938
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	331	877
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(566)	(133)
Estimated Fair Value	54,793	69,682
U.S. Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	176,583	192,291
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	7	73
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(142)	(71)
Estimated Fair Value	176,448	192,293
Foreign Government and Agency Securities [Member]
Available-for-sale securities
Amortized Cost	94,783	313,168
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(33)	0
Estimated Fair Value	94,750	313,168
Mortgage-Backed Securities [Member]
Available-for-sale securities
Amortized Cost	1,264,983	1,200,071
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	5,906	12,848
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(18,205)	(5,380)
Estimated Fair Value	1,252,684	1,207,539
Asset-backed Securities [Member]
Available-for-sale securities
Amortized Cost	215,879	216,068
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	677	1,151
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(703)	(605)
Estimated Fair Value	215,853	216,614
Debt Mutual Fund [Member]
Available-for-sale securities
Amortized Cost	101,350	101,350
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(15,415)	(9,449)
Estimated Fair Value	85,935	91,901
Bank Loans [Member]
Available-for-sale securities
Amortized Cost	130,029	102,092
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,102	25
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(75)	(102)
Estimated Fair Value	131,056	102,015
Commercial Mortgage Backed Securities [Member]
Available-for-sale securities
Amortized Cost	219,675	207,847
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	128	432
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(3,561)	(1,809)
Estimated Fair Value	$ 216,242	$ 206,470

Financial Instruments (Details

Financial Instruments (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	$ 1,366,469	$ 750,635
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(19,602)	(5,672)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	253,415	285,805
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(20,115)	(12,630)
Available-for-Sale Securities, Fair Value, Total	1,619,884	1,036,440
Available-for-Sale Securities, Gross Unrealized Losses, Total	(39,717)	(18,302)
Non-financial institution securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	69,567	52,756
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(733)	(230)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	1,523	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(11)	0
Available-for-Sale Securities, Fair Value, Total	71,090	52,756
Available-for-Sale Securities, Gross Unrealized Losses, Total	(744)	(230)
Auction Rate Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	0	0
Available-for-Sale Securities, 12 Months or Greater, Fair Value	10,227	9,977
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(273)	(523)
Available-for-Sale Securities, Fair Value, Total	10,227	9,977
Available-for-Sale Securities, Gross Unrealized Losses, Total	(273)	(523)
Municipal Bonds [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	32,671	10,138
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(537)	(44)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	1,730	3,867
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(29)	(89)
Available-for-Sale Securities, Fair Value, Total	34,401	14,005
Available-for-Sale Securities, Gross Unrealized Losses, Total	(566)	(133)
U.S. Government and Agency Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	82,785	84,024
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(142)	(71)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0	0
Available-for-Sale Securities, Fair Value, Total	82,785	84,024
Available-for-Sale Securities, Gross Unrealized Losses, Total	(142)	(71)
Foreign Government Debt Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	14,976
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(33)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0
Available-for-Sale Securities, Fair Value, Total	14,976
Available-for-Sale Securities, Gross Unrealized Losses, Total	(33)
Mortgage-Backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	914,938	346,560
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(15,537)	(3,916)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	118,236	114,285
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(2,668)	(1,464)
Available-for-Sale Securities, Fair Value, Total	1,033,174	460,845
Available-for-Sale Securities, Gross Unrealized Losses, Total	(18,205)	(5,380)
Asset-backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	87,937	81,038
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(561)	(502)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	11,380	20,793
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(142)	(103)
Available-for-Sale Securities, Fair Value, Total	99,317	101,831
Available-for-Sale Securities, Gross Unrealized Losses, Total	(703)	(605)
Debt Mutual Fund [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	0	0
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	0	0
Available-for-Sale Securities, 12 Months or Greater, Fair Value	85,935	91,901
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(15,415)	(9,449)
Available-for-Sale Securities, Fair Value, Total	85,935	91,901
Available-for-Sale Securities, Gross Unrealized Losses, Total	(15,415)	(9,449)
Bank Loans [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	12,264	34,358
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(75)	(31)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	0	42,832
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	0	(71)
Available-for-Sale Securities, Fair Value, Total	12,264	77,190
Available-for-Sale Securities, Gross Unrealized Losses, Total	(75)	(102)
Commercial Mortgage Backed Securities [Member]
Fair values and gross unrealized losses of the investments
Available-for-Sale Securities, Less Than 12 Months, Fair Value	151,331	141,761
Available-for-Sale Securities, Less Than 12 Months, Gross Unrealized Losses	(1,984)	(878)
Available-for-Sale Securities, 12 Months or Greater, Fair Value	24,384	2,150
Available-for-Sale Securities, 12 Months or Greater, Gross Unrealized Losses	(1,577)	(931)
Available-for-Sale Securities, Fair Value, Total	175,715	143,911
Available-for-Sale Securities, Gross Unrealized Losses, Total	$ (3,561)	$ (1,809)

Financial Instruments (Detail49

Financial Instruments (Details 2) $ in Thousands	Dec. 31, 2016USD ($)
Amortized cost and estimated fair value of marketable debt securities
Amortized Cost Due in one year or less	$ 839,365
Amortized Cost Due after one year through five years	496,399
Amortized Cost Due after five years through ten years	243,772
Amortized Cost Due after ten years	1,358,644
Amortized Cost Total	2,938,180
Estimated Fair Value Due in one year or less	839,380
Estimated Fair Value Due after one year through five years	494,352
Estimated Fair Value Due after five years through ten years	243,648
Estimated Fair Value Due after ten years	1,345,190
Estimated Fair Value Total	2,922,570
Marketable debt securities with contractual maturities greater than one year but classified as short-term investment	$ 1,950,000

Financial Instruments (Detail50

Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Investments, All Other Investments [Abstract]
Proceeds from Sale of Available-for-sale Securities	$ 130,891	$ 82,396	$ 384,236	$ 203,426
Gross realized gains on sale of available-for-sale securities	624	203	2,055	1,038
Gross realized losses on sale of available-for-sale securities	(679)	(221)	(1,284)	(439)
Net realized gains (losses) on sale of available-for-sale securities	(55)	(18)	771	599
Amortization of premiums on available-for-sale securities	$ 8,034	$ 6,906	$ 22,209	$ 20,417

Derivative Financial Instrume51

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 86,753	$ 83,506
Singapore Dollar [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	21,448	26,978
Euro [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	18,436	19,123
Indian Rupee [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	34,606	23,302
British Pound [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	8,429	10,716
Japanese Yen [Member]
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 3,834	$ 3,387

Derivative Financial Instrume52

Derivative Financial Instruments (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Prepaid expenses and other current assets
Derivative Instruments located on Condensed Consolidated Balance sheet
Asset Derivatives, Fair Value	$ 380	$ 2,161
Other accrued liabilities
Derivative Instruments located on Condensed Consolidated Balance sheet
Liability Derivatives, Fair Value	$ 2,133	$ 1,417

Derivative Financial Instrume53

Derivative Financial Instruments (Details 2) - Cash Flow Hedging [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Foreign Exchange Contracts [Member]
Effect of derivative instruments located on condensed consolidated Statements of Income
Amount of losses recognized in other comprehensive income on derivative (effective portion of cash flow hedging)		$ (2,185)	$ (1,470)	$ (2,229)	$ (5,035)
Other Nonoperating Income (Expense) [Member]
Effect of derivative instruments located on condensed consolidated Statements of Income
Amount of (gains) losses reclassified from accumulated other comprehensive income into income (effective portion)	[1]	(875)	(2,166)	(1,513)	(6,110)
Amount of gains (losses) recorded (ineffective portion)	[1]	$ 23	$ 7	$ 31	$ (15)
[1]	Recorded in Interest and Other Expense, net within the condensed consolidated statements of income.

Derivative Financial Instrume54

Derivative Financial Instruments (Details Textual)	9 Months Ended
	Dec. 31, 2016
Derivative [Line Items]
Hedging Program number of years	2 years
Maturity of Foreign Currency Derivatives	Aug. 13, 2018
Number of Months Net Unrealized Gains/Losses are expected to be realized into Net Income	2 years

Stock-Based Compensation Plan55

Stock-Based Compensation Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 30,867	$ 31,463	$ 90,073	$ 84,464
Cost of Sales [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	1,945	2,145	5,994	5,872
Research and Development [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	17,154	16,935	48,803	44,561
Selling, General and Administrative Expenses [Member]
Stock Based compensation expense
Stock-based compensation effect on income before taxes	$ 11,768	$ 12,383	$ 35,276	$ 34,031

Stock-Based Compensation Plan56

Stock-Based Compensation Plans (Details 1)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Weighted average assumptions in estimation of fair value of stock options
Risk-free interest rate	1.40%	1.30%	0.90%	1.30%
Dividend yield	2.50%	2.70%	2.80%	2.80%

Stock-Based Compensation Plan57

Stock-Based Compensation Plans (Details 2) - $ / shares shares in Thousands	9 Months Ended
	Dec. 31, 2016	Apr. 02, 2016
Summary of options activity
Number of Shares, Beginning Balance	1,257
Number of Shares, Exercised	(1,010)
Number of Shares, Forfeited/Cancelled/Expired	(3)
Number of Shares, Ending Balance	244
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	243	1,241
Weighted-Average Exercise Price Per Share, Beginning Balance	$ 25.42
Weighted-Average Exercise Price Per Share, Exercised	24.78
Weighted-Average Exercise Price Per Share, Forfeited/Cancelled/Expired	26.21
Weighted-Average Exercise Price Per Share, Ending Balance Balance	28.03
Weighted-Average Exercise Price Per Share, Options Exercisable	$ 28.01	$ 25.33

Stock-Based Compensation Plan58

Stock-Based Compensation Plans (Details 3) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Summary Of Restricted Stock Unit Activity and Related Information
Number of Shares, Beginning Balance			6,678
Number of Shares, Granted			3,130
Number of Shares, Vested			(2,269)
Number of Shares, Forfeited/Cancelled			(412)
Number of Shares, Ending Balance	7,127		7,127
Weighted-Average Grant-Date Fair Value, Beginning Balance			$ 40.74
Weighted-Average Grant-Date Fair Value, Vested			39.49
Weighted-Average Grant-Date Fair Value, Forfeited/Cancelled			41.15
Weighted-Average Grant-Date Fair Value, Ending Balance	$ 42.27		42.27
Restricted Stock Units (RSUs) [Member]
Summary Of Restricted Stock Unit Activity and Related Information
Weighted-Average Grant-Date Fair Value, Granted	$ 49.50	$ 43.41	$ 43.40	$ 41.24

Stock-Based Compensation Plan59

Stock-Based Compensation Plans (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended				9 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jan. 02, 2016	Sep. 26, 2015	Dec. 31, 2016	Jan. 02, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Payments Related to Tax Withholding for Share-based Compensation					$ 29.9	$ 29.8
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effective Income Tax Rate Reconciliation, Excess Tax Benefit, Share-based Compensation, Amount	$ 1.2				10.9
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			$ 1.2			8.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 2.8		$ 8.3		$ 24.2	$ 31.6
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.40%		1.30%		0.90%	1.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	2.50%		2.70%		2.80%	2.80%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value, Granted	$ 49.50		$ 43.41		$ 43.40	$ 41.24
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans		446		438
Stock Issued During Period, Value, Employee Stock Purchase Plan		$ 15		$ 14.5
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		1 year 3 months		1 year 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		23.00%		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		0.50%		0.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		2.60%		3.00%
Equity Plan Two Thousand Seven [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant	12,700				12,700
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant-Date Fair Value, Granted		$ 11.64		$ 9.78
Shares Available for Grant	9,000				9,000

Net Income Per Common Share (De

Net Income Per Common Share (Details) shares in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2016shares	Dec. 31, 2016$ / sharesshares
Schedule of Debt Instruments [Line Items]
Antidilutive shares excluded from computation of dilutive net income per common share	296	4,300
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Schedule of Debt Instruments [Line Items]
Maximum number of common shares to be purchased under call option	20,800	20,800
Price Per Share To Be Purchase By Company Under Call Option | $ / shares		$ 28.86

Net Income Per Common Share N61

Net Income Per Common Share Net Income Per Common Share (Details 2) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Earnings Per Share [Abstract]
Net income		$ 141,846	$ 130,819	$ 469,087	$ 405,833
Weighted Average Number of Shares Outstanding, Basic		250,982	256,450	252,811	257,491
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements		2,907	2,538	2,400	2,416
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	[1]	10,165	8,067	9,212	7,303
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants		6,727	2,556	4,759	1,506
Weighted Average Number of Shares Outstanding, Diluted		270,781	269,611	269,182	268,716
Earnings Per Share, Basic		$ 0.57	$ 0.51	$ 1.86	$ 1.58
Earnings Per Share, Diluted		$ 0.52	$ 0.49	$ 1.74	$ 1.51
[1]	[1] To hedge against potential dilution upon conversion of the 2017 Convertible Notes, the Company purchased call options on its common stock from the hedge counter-parties. The call options give the Company the right to purchase up to 20.8 million shares of its common stock at $28.86 per share. These call options are not considered for purposes of calculating the total shares outstanding under the basic and diluted net income per share, as their effect would be anti-dilutive. Upon exercise, the call options would serve to neutralize the dilutive effect of the 2017 Convertible Notes and reduce the weighted number of diluted shares used in per share calculations.

Inventories Inventories (Detail

Inventories Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	$ 15,354	$ 15,346
Inventory, Work in Process, Gross	147,650	123,675
Inventory, Finished Goods, Gross	42,923	39,529
Inventory, Net	$ 205,927	$ 178,550

Debt and Credit Facility (Detai

Debt and Credit Facility (Details 1) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016	Apr. 02, 2016
Debt Instrument [Line Items]
Amortization of Debt Discount (Premium)			$ 9,053,000	$ 9,033,000
Long-term debt	$ 994,842,000		994,842,000		$ 993,639,000
2.125% 2019 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000,000		500,000,000		500,000,000
Debt Instrument, Unamortized Discount	1,169,000		1,169,000		1,560,000
Unamortized Debt Issuance Expense	$ 740,000		$ 740,000		996,000
Debt instrument, long term debt, remaining discount amortization period			2 years 2 months 15 days
Debt Instrument, Maturity Date			Mar. 15, 2019
Discount Percent Of Par	99.477%		99.477%
3.0% 2021 Senior Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500,000,000		$ 500,000,000		500,000,000
Debt Instrument, Unamortized Discount	2,233,000		2,233,000		2,605,000
Unamortized Debt Issuance Expense	$ 1,016,000		$ 1,016,000		$ 1,200,000
Debt instrument, long term debt, remaining discount amortization period			4 years 2 months 15 days
Debt Instrument, Maturity Date			Mar. 15, 2021
Discount Percent Of Par	99.281%		99.281%
2019 and 2021 Notes Payable [Member]
Debt Instrument [Line Items]
Interest Expense, Debt, Excluding Amortization	$ 6,406,000	$ 6,406,000	$ 19,219,000	19,219,000
Amortization of Financing Costs	146,000	146,000	439,000	439,000
Amortization of Debt Discount (Premium)	257,000	251,000	764,000	745,000
Interest Expense, Debt	6,809,000	$ 6,803,000	$ 20,422,000	$ 20,403,000
two thousand and sixteen credit line [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date			Dec. 31, 2021
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000		$ 400,000,000
Line of Credit Facility, Initiation Date			Dec. 7, 2016
Additional borrowing capacity from Revolving Credit Facility	150,000,000		$ 150,000,000
Line of Credit Facility, Average Outstanding Amount			$ 0
two thousand and eleven credit line [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date			Dec. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity	$ 250,000,000		$ 250,000,000
Line of Credit Facility, Initiation Date			Dec. 7, 2011

Debt and Credit Facility (Det64

Debt and Credit Facility (Details 2) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares	Jan. 02, 2016USD ($)	Dec. 31, 2016USD ($)$ / sharesshares	Jan. 02, 2016USD ($)	Apr. 02, 2016USD ($)
Short-term Debt [Line Items]
Amortization of Debt Discount (Premium)			$ 9,053,000	$ 9,033,000
Two And Six Two Five Percent Senior Convertible Debentures [Member]
Short-term Debt [Line Items]
Amount of conversion notice received	$ 142,000,000
Debt Instrument, Convertible, Threshold Trading Days	20
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	130.00%
Debt Instrument, Convertible, Threshold Consecutive Trading Days	30 days
Debt Instrument, Convertible, Conversion Ratio	34.6495
Base conversion, block amount of senior convertible debenture	$ 1,000
Convertible debt, conversion price | $ / shares	$ 28.8604		$ 28.8604
Debt Instrument, Face Amount	$ 600,000,000		$ 600,000,000		$ 600,000,000
Debt Instrument, Unamortized Discount	6,477,000		6,477,000		18,135,000
Hedge Accounting Adjustment - Sale Of Interest Rate Swap	1,872,000		1,872,000		5,241,000
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net	(603,000)		(603,000)		(1,689,000)
Convertible Debt	594,792,000		594,792,000		585,417,000
Debt Instrument, Convertible, Carrying Amount of Equity Component	66,415,000		$ 66,415,000		$ 66,415,000
Debt Instrument, Convertible, Remaining Discount Amortization Period			5 months 14 days
Debt Instrument, Convertible, If-converted Value in Excess of Principal	1,180,000,000		$ 1,180,000,000
Interest Expense, Debt, Excluding Amortization	3,938,000	$ 3,938,000	11,813,000	11,813,000
Amortization of Financing Costs	362,000	362,000	1,086,000	1,086,000
Amortization of Debt Discount (Premium)	2,763,000	2,763,000	8,289,000	8,289,000
Interest Expense, Debt	$ 7,063,000	$ 7,063,000	$ 21,188,000	$ 21,188,000
Maximum number of common shares to be purchased under call option | shares	20.8		20.8
Price Per Share To Be Purchase By Company Under Call Option | $ / shares			$ 28.86
Warrants, number of shares the holders have the right to purchase | shares	20.8		20.8
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 40.89		$ 40.89

Common Stock Repurchase Progr65

Common Stock Repurchase Program (Details) - USD ($)	8 Months Ended	9 Months Ended		25 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	May 16, 2016	Apr. 02, 2016	Nov. 17, 2014
Accelerated Share Repurchases [Line Items]
Treasury shares	0	0		0		0
Repurchase Program Two Thousand Fourteen [Member]
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount							$ 800,000,000
Stock Repurchased During Period, Value				$ 800,000,000
Stock Repurchased and Retired During Period, Value		$ 414,000,000	$ 300,000,000
Stock Repurchased and Retired During Period, Shares		8,000,000	6,700,000
Repurchase Program Two Thousand Sixteen [Member] [Domain]
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount					$ 1,000,000,000
Stock Repurchased During Period, Value	$ 209,800,000
Total amount available for future repurchases	$ 790,200,000	$ 790,200,000		$ 790,200,000

Interest and Other Expense, N66

Interest and Other Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Components of interest and other expense
Interest income	$ 14,504	$ 12,640	$ 38,068	$ 28,739
Interest expense	(13,872)	(13,866)	(41,610)	(41,591)
Other income (expense), net	(1,024)	(3,827)	(2,588)	(11,941)
Interest and other expense, net	$ (392)	$ (5,053)	$ (6,130)	$ (24,793)

Accumulated Other Comprehensi67

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 02, 2016
Components of accumulated other comprehensive income (loss)
Accumulated unrealized losses on available-for-sale securities, net of tax	$ (19,646)	$ (1,260)
Accumulated unrealized losses on hedging transactions, net of tax	(1,973)	256
Accumulated cumulative translation adjustment, net of tax	(8,822)	(5,627)
Accumulated other comprehensive loss	$ (30,441)	$ (6,631)

Income Taxes (Details Textual)

Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Income Tax Disclosure [Abstract]
Income Tax Expense (Benefit)	$ 20,734	$ 24,232	$ 50,773	$ 61,155
Effective Income Tax Rate Reconciliation, Percent	13.00%	16.00%	10.00%	13.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 289
Unrecognized Tax Benefits	26,300		$ 26,300
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	7,600		7,600
Effective Income Tax Rate Reconciliation, Excess Tax Benefit, Share-based Compensation, Amount	$ 1,200		$ 10,900

Commitments (Details)

Commitments (Details) $ in Thousands	Dec. 31, 2016USD ($)
Future Minimum Lease Payments Under Non-Cancelable Operating Leases [Abstract]
2017 (remaining 3 months)	$ 1,640
2,018	5,591
2,019	4,358
2,020	3,311
2,021	2,292
Thereafter	1,774
Total	$ 18,966

Commitments (Details Textual)

Commitments (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016
Commitments [Line Items]
Lease Expiration Date			Dec. 31, 2025
Aggregate future rental income to be received	$ 2.2		$ 2.2
Rent expense, net of rental income	1.3	$ 1.2	3.8	$ 3.3
Non-cancelable license obligations	55.7		$ 55.7
Software and Maintenance License Obligations Expiration Date			Dec. 28, 2019
Purchase Obligation	$ 143.7		$ 143.7
Minimum [Member]
Commitments [Line Items]
Purchase Commitments, Period for Payment			3 months
Maximum [Member]
Commitments [Line Items]
Purchase Commitments, Period for Payment			6 months
Capital Lease Obligations [Member]
Commitments [Line Items]
Lease Expiration Date			Nov. 30, 2035

Contingencies (Details)

Contingencies (Details) $ in Millions	9 Months Ended
	Dec. 31, 2016USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 50

Goodwill and Acquisition-Rela72

Goodwill and Acquisition-Related Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Apr. 02, 2016
Gross and net amounts of goodwill and of acquisition-related intangibles
Goodwill	$ 161,287	$ 159,296
Total acquisition-related intangibles, gross	126,746	124,246
Less accumulated amortization	(121,987)	(118,044)
Total	4,759	6,202
Core Technology [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	79,980	77,640
Less accumulated amortization	(75,348)	(71,472)
Total	$ 4,632	6,168
Weighted-Average Amortization Life	5 years 7 months 18 days
Other Intangibles [Member]
Gross and net amounts of goodwill and of acquisition-related intangibles
Total acquisition-related intangibles, gross	$ 46,766	46,606
Less accumulated amortization	(46,639)	(46,572)
Total	$ 127	$ 34
Weighted-Average Amortization Life	2 years 7 months 12 days

Goodwill and Acquisition-Rela73

Goodwill and Acquisition-Related Intangibles (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 31, 2016	Jan. 02, 2016	Apr. 02, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquisition-related intangibles	$ 1,455	$ 1,769	$ 3,943	$ 5,306
Schedule of expected annual amortization expense for acquisition-related intangibles
2016 (remaining three months)	1,184		1,184
2,017	1,922		1,922
2,018	561		561
2,019	468		468
Finite-Lived Intangible Assets, Amortization Expense, Year Five	468		468
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	156		156
Total	$ 4,759		$ 4,759		$ 6,202

Subsequent Events (Details)

Subsequent Events (Details)	Jan. 24, 2017$ / shares
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.33