Description Of Business and Basis Of Presentation	6 Months Ended
Mar. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Skyworks Solutions, Inc., together with its consolidated subsidiaries (“Skyworks” or the “Company”), is empowering the wireless networking revolution. The Company’s highly innovative analog semiconductors are connecting people, places, and things, spanning a number of new and previously unimagined applications within the automotive, broadband, cellular infrastructure, connected home, industrial, medical, military, smartphone, tablet and wearable markets. The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial reporting. Certain information and footnote disclosures, normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), have been condensed or omitted pursuant to those rules and regulations. However, in management’s opinion, the financial information reflects all adjustments, including those of a normal recurring nature, necessary to present fairly the results of operations, financial position, and cash flows of the Company for the periods presented. The results of operations, financial position, and cash flows for the Company during the interim periods are not necessarily indicative of those expected for the full year. This information should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 29, 2017, filed with the SEC on November 13, 2017, as amended by Amendment No. 1 to such Annual Report on Form 10-K, filed with the SEC on January 26, 2018 (the “2017 10-K”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts of assets, liabilities, revenue, expenses, comprehensive income and accumulated other comprehensive loss that are reported in these unaudited consolidated financial statements and accompanying disclosures. The Company evaluates its estimates on an ongoing basis using historical experience and other factors, including the current economic environment. Significant judgment is required in determining the reserves for and fair value of items such as overall fair value assessments of assets and liabilities, particularly those classified as Level 2 or Level 3 in the fair value hierarchy, inventory, intangible assets associated with business combinations, share-based compensation, loss contingencies, and income taxes. In addition, significant judgment is required in determining whether a potential indicator of impairment of long-lived assets exists and in estimating future cash flows for any necessary impairment testing. Actual results could differ significantly from these estimates. The Company’s fiscal year ends on the Friday closest to September 30. Fiscal year 2018 consists of 52 weeks and ends on September 28, 2018. Fiscal year 2017 consisted of 52 weeks and ended on September 29, 2017. The second quarters of fiscal year 2018 and fiscal year 2017 each consisted of 13 weeks and ended on March 30, 2018, and March 31, 2017, respectively. Recently Adopted Accounting Pronouncements In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The Company adopted ASU 2016-09 at the beginning of the first quarter of fiscal year 2018. As a result of adoption, the Company recognized a discrete income tax benefit of $22.5 million to the income tax provision for excess tax benefits generated by the settlement of share-based awards for the six months ended March 30, 2018. The adoption also resulted in an increase in cash flow from operations and a decrease of cash flow from financing of $22.5 million for the six months ended March 30, 2018. Prior periods have not been adjusted. The Company has elected to account for forfeitures as they occur and will no longer estimate future forfeitures. The change in accounting for forfeitures was applied using a modified retrospective transition method and resulted in a cumulative-effect adjustment to retained earnings as of the beginning of the first quarter of fiscal year 2018 in the amount of $1.9 million. Forfeitures in the future will now be recorded as a benefit in the period they are realized. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). This ASU simplifies the subsequent measurement of goodwill and eliminates Step 2 from the goodwill impairment test. The annual or interim goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount, and an impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. The Company early adopted ASU 2017-04 during the second quarter of 2018 and applied it prospectively, as permitted by the standard. The adoption of this standard did not impact the Company’s consolidated financial statements. Recently Issued Accounting Pronouncements In August 2015, the FASB deferred the effective date of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most current revenue recognition guidance. 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. We will adopt this guidance during the first quarter of fiscal year 2019 and currently expect to apply the modified retrospective approach, with the cumulative effect of applying the new guidance recognized as an adjustment to the opening retained earnings balance. We have established a cross-functional team to assess the potential impact of the new revenue standard. The assessment process consists of reviewing our current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to our revenue contracts and identifying appropriate changes to the business processes, systems and controls to support revenue recognition and disclosure requirements under the new standard. We are continuing to evaluate the potential impact on our business processes, systems, controls and our consolidated financial statements of the new revenue standard. Based on our preliminary assessments, we do not expect the new guidance to have a material impact on the nature, amount, and timing of our revenue recognition. As we continue to assess the impact of the new guidance on our revenue contracts with our customers and finalize our evaluation of any changes to our accounting policies, internal controls and footnote disclosures, we may identify additional areas of impact and may revise the results of our preliminary assessment. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). This ASU requires lessees to reflect most leases on their balance sheet as assets and obligations. The effective date for the standard is for fiscal years beginning after December 15, 2018, with early adoption permitted. The standard is to be applied under the modified retrospective method, with elective reliefs, which requires application of the new guidance for all periods presented. We are currently evaluating the effect that ASU 2016-02 will have on the consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230), (“ASU 2016-15”). This ASU provides guidance on the presentation and classification of specific cash flow items to improve consistency within the statement of cash flows. The effective date for the standard is for fiscal years beginning after December 15, 2017, with early adoption permitted. We are currently evaluating the effect that ASU 2016-15 will have on the consolidated financial statements and related disclosures. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740), Intra-entity Transfers of an Asset Other than Inventory (“ASU 2016-16”). This ASU provides guidance that changes the accounting for income tax effects of intra-entity transfers of assets other than inventory. Under the new guidance, the selling (transferring) entity is required to recognize a current tax expense or benefit upon transfer of the asset. Similarly, the purchasing (receiving) entity is required to recognize a deferred tax asset or deferred tax liability, as well as the related deferred tax benefit or expense, upon receipt of the asset. The effective date for the standard is for fiscal years beginning after December, 15, 2017, on a modified retrospective basis, and early adoption is permitted. We are currently evaluating the effect ASU 2016-16 will have on the consolidated financial statements. In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718), Scope of Modification Accounting. This ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The effective date for the standard is for interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted, including adoption in any interim period for which financial statements have not yet been issued. We are currently evaluating the potential impact of this standard on the consolidated financial statements. Supplemental Cash Flow Information At March 30, 2018, the Company had $13.9 million accrued to other long-term liabilities for capital equipment, and $22.2 million accrued to accounts payable for capital equipment. These amounts accrued for capital equipment purchases have been excluded from the consolidated statements of cash flows for the six months ended March 30, 2018, and are expected to be paid in subsequent periods. Certain prior period amounts in the condensed consolidated statements of cash flows have been reclassified to conform to current period presentation. The description “Contribution of common shares to employee savings plan” has been reclassified from net cash provided by operating activities to net cash used in financing activities.

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Skyworks Solutions, Inc., together with its consolidated subsidiaries (“Skyworks” or the “Company”), is empowering the wireless networking revolution. The Company’s highly innovative analog semiconductors are connecting people, places, and things, spanning a number of new and previously unimagined applications within the automotive, broadband, cellular infrastructure, connected home, industrial, medical, military, smartphone, tablet and wearable markets.

The accompanying unaudited interim consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial reporting. Certain information and footnote disclosures, normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”), have been condensed or omitted pursuant to those rules and regulations. However, in management’s opinion, the financial information reflects all adjustments, including those of a normal recurring nature, necessary to present fairly the results of operations, financial position, and cash flows of the Company for the periods presented. The results of operations, financial position, and cash flows for the Company during the interim periods are not necessarily indicative of those expected for the full year. This information should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 29, 2017, filed with the SEC on November 13, 2017, as amended by Amendment No. 1 to such Annual Report on Form 10-K, filed with the SEC on January 26, 2018 (the “2017 10-K”).

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts of assets, liabilities, revenue, expenses, comprehensive income and accumulated other comprehensive loss that are reported in these unaudited consolidated financial statements and accompanying disclosures. The Company evaluates its estimates on an ongoing basis using historical experience and other factors, including the current economic environment. Significant judgment is required in determining the reserves for and fair value of items such as overall fair value assessments of assets and liabilities, particularly those classified as Level 2 or Level 3 in the fair value hierarchy, inventory, intangible assets associated with business combinations, share-based compensation, loss contingencies, and income taxes. In addition, significant judgment is required in determining whether a potential indicator of impairment of long-lived assets exists and in estimating future cash flows for any necessary impairment testing. Actual results could differ significantly from these estimates.

The Company’s fiscal year ends on the Friday closest to September 30. Fiscal year 2018 consists of 52 weeks and ends on September 28, 2018. Fiscal year 2017 consisted of 52 weeks and ended on September 29, 2017. The second quarters of fiscal year 2018 and fiscal year 2017 each consisted of 13 weeks and ended on March 30, 2018, and March 31, 2017, respectively.

Recently Adopted Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The Company adopted ASU 2016-09 at the beginning of the first quarter of fiscal year 2018. As a result of adoption, the Company recognized a discrete income tax benefit of $22.5 million to the income tax provision for excess tax benefits generated by the settlement of share-based awards for the six months ended March 30, 2018. The adoption also resulted in an increase in cash flow from operations and a decrease of cash flow from financing of $22.5 million for the six months ended March 30, 2018. Prior periods have not been adjusted. The Company has elected to account for forfeitures as they occur and will no longer estimate future forfeitures. The change in accounting for forfeitures was applied using a modified retrospective transition method and resulted in a cumulative-effect adjustment to retained earnings as of the beginning of the first quarter of fiscal year 2018 in the amount of $1.9 million. Forfeitures in the future will now be recorded as a benefit in the period they are realized.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”). This ASU simplifies the subsequent measurement of goodwill and eliminates Step 2 from the goodwill impairment test. The annual or interim goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount, and an impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. The Company early adopted ASU 2017-04 during the second quarter of 2018 and applied it prospectively, as permitted by the standard. The adoption of this standard did not impact the Company’s consolidated financial statements.

Recently Issued Accounting Pronouncements

In August 2015, the FASB deferred the effective date of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most current revenue recognition guidance. 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. We will adopt this guidance during the first quarter of fiscal year 2019 and currently expect to apply the modified retrospective approach, with the cumulative effect of applying the new guidance recognized as an adjustment to the opening retained earnings balance. We have established a cross-functional team to assess the potential impact of the new revenue standard. The assessment process consists of reviewing our current accounting policies and practices to identify potential differences that would result from applying the requirements of the new standard to our revenue contracts and identifying appropriate changes to the business processes, systems and controls to support revenue recognition and disclosure requirements under the new standard. We are continuing to evaluate the potential impact on our business processes, systems, controls and our consolidated financial statements of the new revenue standard. Based on our preliminary assessments, we do not expect the new guidance to have a material impact on the nature, amount, and timing of our revenue recognition. As we continue to assess the impact of the new guidance on our revenue contracts with our customers and finalize our evaluation of any changes to our accounting policies, internal controls and footnote disclosures, we may identify additional areas of impact and may revise the results of our preliminary assessment.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (“ASU 2016-02”). This ASU requires lessees to reflect most leases on their balance sheet as assets and obligations. The effective date for the standard is for fiscal years beginning after December 15, 2018, with early adoption permitted. The standard is to be applied under the modified retrospective method, with elective reliefs, which requires application of the new guidance for all periods presented. We are currently evaluating the effect that ASU 2016-02 will have on the consolidated financial statements and related disclosures.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230), (“ASU 2016-15”). This ASU provides guidance on the presentation and classification of specific cash flow items to improve consistency within the statement of cash flows. The effective date for the standard is for fiscal years beginning after December 15, 2017, with early adoption permitted. We are currently evaluating the effect that ASU 2016-15 will have on the consolidated financial statements and related disclosures.

In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740), Intra-entity Transfers of an Asset Other than Inventory (“ASU 2016-16”). This ASU provides guidance that changes the accounting for income tax effects of intra-entity transfers of assets other than inventory. Under the new guidance, the selling (transferring) entity is required to recognize a current tax expense or benefit upon transfer of the asset. Similarly, the purchasing (receiving) entity is required to recognize a deferred tax asset or deferred tax liability, as well as the related deferred tax benefit or expense, upon receipt of the asset. The effective date for the standard is for fiscal years beginning after December, 15, 2017, on a modified retrospective basis, and early adoption is permitted. We are currently evaluating the effect ASU 2016-16 will have on the consolidated financial statements.

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718), Scope of Modification Accounting. This ASU provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. The effective date for the standard is for interim periods in fiscal years beginning after December 15, 2017, with early adoption permitted, including adoption in any interim period for which financial statements have not yet been issued. We are currently evaluating the potential impact of this standard on the consolidated financial statements.

Supplemental Cash Flow Information

At March 30, 2018, the Company had $13.9 million accrued to other long-term liabilities for capital equipment, and $22.2 million accrued to accounts payable for capital equipment. These amounts accrued for capital equipment purchases have been excluded from the consolidated statements of cash flows for the six months ended March 30, 2018, and are expected to be paid in subsequent periods. Certain prior period amounts in the condensed consolidated statements of cash flows have been reclassified to conform to current period presentation. The description “Contribution of common shares to employee savings plan” has been reclassified from net cash provided by operating activities to net cash used in financing activities.