Background and Basis of Presentation (Policies)	9 Months Ended
Background and Basis of Presentation (Policies)	Sep. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Adoption of New Revenue Standard and Change in Accounting Policy	Adoption of New Revenue Standard On January 1, 2018, as required, the Company adopted ASU No. 2014-09 - Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), ASU No. 2015-14 - Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date ("ASU 2015-14"), ASU No. 2016-08 - Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ("ASU 2016-08"), ASU No. 2016-10 - Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU 2016-10"), ASU No. 2016-12 - Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ("ASU 2016-12") and ASU No. 2016-20 - Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers ("ASU 2016-20") (collectively, the “New Revenue Standard”). To conform to the New Revenue Standard, the Company modified its revenue recognition policy as described below. Change in Accounting Policy On January 1, 2018, the Company adopted the New Revenue Standard using the modified retrospective method, applying the guidance to all open contracts, and recognized the cumulative effect adjustment of $2.1 million to retained earnings and accrued expenses as of that date. The comparative financial information has not been restated and continues to be presented under the accounting standards in effect for the respective periods. The Company applied the practical expedient and has not disclosed the revenue allocated to future shipments of partially completed contracts. Substantially all of the Company’s revenue continues to be recognized following the transfer of control of the products to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. Under the New Revenue Standard, revenue from certain product development agreements, which was previously deferred as delivered, is now recognized over time. ASUs Adopted: New Revenue Standard The Company adopted the New Revenue Standard on a modified retrospective basis on January 1, 2018. The cumulative-effect adjustment related to the timing of revenue recognition on certain product development agreements recorded to beginning retained earnings as of January 1, 2018, was $2.1 million. The Company expects the ongoing impact of the New Revenue Standard to be immaterial to the consolidated financial statements. ASU No. 2017-09 - Scope of Modification Accounting ("ASU 2017-09") In May 2017, the FASB issued ASU No. 2017-09 to reduce diversity in practice and provide clarity regarding existing guidance in ASC 718, “Stock Compensation.” The amendments clarify that an entity should apply modification accounting in response to a change in the terms and conditions of an entity’s share-based payment awards unless three newly specified criteria are met. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2017-09 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASU No 2017-07 - Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost ("ASU 2017-07") In March 2017, the FASB issued ASU 2017-07 primarily to improve the presentation of net periodic pension cost and net periodic postretirement benefit cost. The guidance will require the net benefit cost to be split in the income statement. The service cost component will be included in operating income. The other components, including amortization of past service costs or credits and settlement and curtailments amounts, will be reported separately outside of operating income. The amendment is effective for fiscal years beginning after December 15, 2017. The Company adopted ASU 2017-07 during the first quarter of 2018, applying the standard retrospectively to all periods presented. The adoption of this standard did not have a material impact on the current period or prior period consolidated financial statements. See Note 6: ''Balance Sheet Information'' for further information on the adoption of ASU 2017-07. ASU No. 2016-18 - Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force) ("ASU 2016-18") In November 2016, the FASB issued ASU 2016-18, which requires entities to include in their cash and cash-equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents. The ASU does not define the terms “restricted cash” and “restricted cash equivalents.” The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-18 during the first quarter of 2018, applying the standard retrospectively to all periods presented. The adoption of this standard did not have a material impact on the current period or prior period consolidated financial statements. See Note 15: ''Supplemental Disclosures'' for further information on the adoption of ASU 2016-18. ASU No. 2016-16 - Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory ("ASU 2016-16") In October 2016, the FASB issued ASU 2016-16, which eliminates the exception for all intra-entity sales of assets other than inventory. As a result, a reporting entity would recognize the tax expense from the sale of the asset in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer’s jurisdiction would also be recognized at the time of the transfer. The new guidance does not apply to intra-entity transfers of inventory. The income tax consequences from the sale of inventory from one member of a consolidated entity to another will continue to be deferred until the inventory is sold to a third party. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-16 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASU No. 2016-15 - Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") In August 2016, the FASB issued ASU 2016-15, which changes how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The Company adopted ASU 2016-15 during the first quarter of 2018. The adoption of this standard did not have a material impact on the consolidated financial statements. ASUs Pending Adoption: ASU No. 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12") In August 2017, the FASB issued ASU No. 2017-12 to better align hedge accounting with risk management strategies, and as a result, more hedging strategies will be eligible for hedge accounting. Public business entities will have until the end of the first quarter in which a hedge is designated to perform an initial assessment of a hedge’s effectiveness. After initial qualification, the new guidance permits a qualitative effectiveness assessment for certain hedges instead of a quantitative test if the company can reasonably support an expectation of high effectiveness throughout the term of the hedge. An initial quantitative test to establish that the hedge relationship is highly effective is still required. The amendments are effective for fiscal years beginning after December 15, 2018. Early adoption is permitted. The Company does not anticipate the adoption of ASU 2017-12 will have a material impact on its consolidated financial statements. ASU No. 2016-02 - Leases (Topic 842) ("ASU 2016-02"), ASU No. 2018-10 - Codification improvements to Topic 842, Leases (“ASU 2018-10”), ASU No. 2018-11 - Leases (Topic 842) (“ASU 2018-11”) (collectively, the “New Leasing Standard”) In February 2016, the FASB issued ASU 2016-02, which amended the accounting treatment for leases. Lessees (for capital and operating leases) and lessors (for sales-type leases, direct financing leases and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. In July 2018, the FASB issued ASU 2018-10 and ASU 2018-11. ASU 2018-10 provides certain areas for improvement in ASU 2016-02 and ASU 2018-11 provides an additional optional transition method by allowing entities to initially apply the New Leasing Standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The New Leasing Standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. The Company expects the adoption of this standard will result in the inclusion of a significant component of the Company's future minimum lease obligations as disclosed in Note 10: ''Commitments and Contingencies'' on its Consolidated Balance Sheets. The Company continues to review its service agreements and other arrangements to evaluate whether they meet the definition of a lease under ASU 2016-02 and what additional impact, if any, that the adoption of the New Leasing Standard may have on its consolidated financial statements.
Revenue Recognition Policy	Revenue Recognition Policy In anticipation of the adoption of the New Revenue Standard, during the quarter ended March 31, 2017, the Company developed its internal systems, processes and controls to enable it to make the estimates required by the New Revenue Standard on sales to its distributors and was able to reliably estimate upfront the effects of returns and allowances and record revenue at the time of shipments to these distributors. Prior to this, the Company recognized revenue from distributors under the sell-through method as it did not have the ability to estimate the effects of returns and allowances. As a result of this change, the Company recognized an additional $155.1 million in revenue during the first quarter of 2017, which resulted in an increase of $59.0 million to income before income taxes. The Company generates revenue from sales of its semiconductor products to OEMs, electronic manufacturing service providers and distributors. The Company also generates revenue, to a much lesser extent, from product development agreements and manufacturing services provided to customers. The Company recognizes revenue when it satisfies a performance obligation in an amount reflecting the consideration to which it expects to be entitled. For sales agreements, the Company has identified the promise to transfer products, each of which is distinct, to be the performance obligation. For product development agreements, the Company has identified the completion of a service defined in the agreement to be the performance obligation. The Company applies a five-step approach in determining the amount and timing of revenue to be recognized: (1) identifying the contract with a customer; (2) identifying the performance obligations in the contract; (3) determining the transaction price; (4) allocating the transaction price to the performance obligations in the contract; and (5) recognizing revenue when the performance obligation is satisfied. Substantially all of the Company’s revenue is recognized at the time control of the products transfers to the customer. Sales agreements with customers are renewable periodically and contain terms and conditions with respect to payment, delivery, warranty and supply, but typically do not require minimum purchase commitments. In the absence of a sales agreement, the Company’s standard terms and conditions apply. The Company considers the customer purchase orders, governed by sales agreements or the Company’s standard terms and conditions, to be the contract with the customer. The Company evaluates certain factors including the customer’s ability to pay (or credit risk). Most of the Company’s OEM customers negotiate pricing terms on an annual basis, while the electronic manufacturer service providers and distributors generally negotiate pricing terms on a quarterly basis. Pricing terms on product development agreements are negotiated at the beginning of a project. The Company allocates the transaction price to each distinct product based on its relative stand-alone selling price. In determining the transaction price, the Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the Company expects to be entitled. The Company’s OEM customers do not have the right to return products, other than pursuant to the provisions of the Company’s standard warranty. Sales to distributors, however, are typically made pursuant to agreements that provide return rights with respect to discontinued or slow-moving products, referred to as stock rotation. Sales to certain distributors, primarily those with ship and credit rights, can also be subject to price adjustment on certain products. Although payment terms vary, most distributor agreements require payment within 30 days. In addition, the Company offers cash discounts to certain customers for payments received within an agreed upon time, generally 10 days after shipment. The Company recognizes revenue when it satisfies a performance obligation. The Company recognizes revenue from sales agreements upon transferring control of a product to the customer. This typically occurs when products are shipped or delivered, depending on the delivery terms, or when products that are consigned at customer locations are consumed. The Company recognizes revenue from product development agreements over time based on the cost-to-cost method. Revenue recognized during the quarter and nine months ended September 28, 2018 for sales agreements was $1,534.7 million and $4,355.4 million, respectively, and for product development agreements was $7.0 million and $19.8 million, respectively. Sales returns and allowances are estimated based on historical experience. Provisions for discounts and rebates to customers, estimated returns and allowances, ship and credit claims and other adjustments are provided for in the same period the related revenue are recognized, and are netted against revenue. For returns, the Company recognizes a related asset for the right to recover returned products with a corresponding reduction to cost of goods sold. The Company records a reserve for cash discounts as a reduction to accounts receivable and a reduction to revenue, based on the experience with each customer. Frequently, the Company receives orders with multiple delivery dates that may extend across reporting periods. Since each delivery constitutes a performance obligation, the Company allocates the transaction price of the contract to each performance obligation based on the stand-alone selling price of the products. The Company invoices the customer for each delivery upon shipment and recognizes revenue in accordance with delivery terms. As scheduled delivery dates are within one year, revenue allocated to future shipments of partially completed contracts are not disclosed. The Company has elected to record freight and handling costs associated with outbound freight after control over a product has transferred to a customer as a fulfillment cost and include it in cost of revenue. Taxes assessed by government authorities on revenue-producing transactions, including value-added and excise taxes, are presented on a net basis (excluded from revenue) in the Consolidated Statements of Operations and Comprehensive Income. The Company generally warrants that products sold to its customers will, at the time of shipment, be free from defects in workmanship and materials and conform to specifications. The Company’s standard warranty extends for a period of two years from the date of delivery, except in the case of image sensor products, which are warrantied for one year from the date of delivery. At the time revenue is recognized, the Company establishes an accrual for estimated warranty expenses associated with its sales and records them as a component of the cost of revenue
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities at the date of the financial statements and the reported amount of revenue and expenses during the reporting period. Management evaluates these estimates and judgments on an ongoing basis and bases its estimates on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. Significant estimates have been used by management in conjunction with the following: (i) estimates of future payouts for customer incentives and estimates of amounts subject to allowances, returns and warranties; (ii) measurement of valuation allowances relating to inventories and trade receivables; (iii) future cash flows used to assess and test for impairment of goodwill and indefinite-lived intangible assets and long-lived assets, if applicable; (iv) assumptions surrounding future pension obligations; (v) fair values of share-based compensation and of financial instruments (including derivative financial instruments); (vi) measurement of valuation allowances against deferred tax assets, evaluations of uncertain tax positions and the impact of U.S. tax reform; and (vii) estimates and assumptions used in connection with business combinations. Actual results may differ from the estimates and assumptions used in the consolidated financial statements and related notes.
Foreign Currencies	Foreign Currencies Most of the Company’s foreign subsidiaries conduct business primarily in U.S. Dollars and, as a result, utilize the U.S. Dollar as their functional currency. For the remeasurement of financial statements of these subsidiaries, assets and liabilities in foreign currencies that are receivable or payable in cash are remeasured at current exchange rates, while inventories and other non-monetary assets in foreign currencies are remeasured at historical rates. Gains and losses resulting from the remeasurement of such financial statements are included in the operating results, as are gains and losses incurred on foreign currency transactions. Historically, the majority of the Company’s Japanese subsidiaries utilized Japanese Yen as their functional currency. The assets and liabilities of these subsidiaries are translated at current exchange rates, while revenue and expenses are translated at the average rates in effect for the period. The related translation gains and losses are included in other comprehensive income or loss within the Consolidated Statements of Operations and Comprehensive Income. As a result of an analysis which took into account the economic indicators of these subsidiaries from a long-term perspective, the Company changed the functional currency for some of these subsidiaries from Japanese Yen to U.S. Dollars effective as of January 1, 2018.
Cost Method Investments	Cost and Equity Method Investments The Company accounts for investments in companies that it does not control, or have significant influence over, under the cost method, as applicable. If a decline in the fair value of a cost method investment is determined to be other than temporary, an impairment charge is recorded, and the carrying value of the cost method investment is reduced to fair value. The Company evaluates all of its cost method investments for impairment; however, it is not required to determine the fair value of its investment unless impairment indicators are present.