Description Of Business and Basis Of Presentation	3 Months Ended
Dec. 29, 2017
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 allowance for doubtful accounts, 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 first quarters of fiscal year 2018 and fiscal year 2017 each consisted of 13 weeks and ended on December 29, 2017, and December 30, 2016, 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 $16.2 million to the income tax provision for excess tax benefits generated by the settlement of share-based awards in the first quarter of fiscal year 2018. The adoption also resulted in an increase in cash flow from operations and a decrease of cash flow from financing of $16.2 million in the first quarter of fiscal year 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. Supplemental Cash Flow Information At December 29, 2017, the Company had $13.6 million for capital equipment that was accrued to other long-term liabilities, and $8.6 million for capital equipment that was accrued to accounts payable. These amounts accrued for capital equipment purchases have been excluded from the consolidated statements of cash flows for the three months ended December 29, 2017, and are expected to be paid in subsequent periods.

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 allowance for doubtful accounts, 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 first quarters of fiscal year 2018 and fiscal year 2017 each consisted of 13 weeks and ended on December 29, 2017, and December 30, 2016, 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 $16.2 million to the income tax provision for excess tax benefits generated by the settlement of share-based awards in the first quarter of fiscal year 2018. The adoption also resulted in an increase in cash flow from operations and a decrease of cash flow from financing of $16.2 million in the first quarter of fiscal year 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.

Supplemental Cash Flow Information

At December 29, 2017, the Company had $13.6 million for capital equipment that was accrued to other long-term liabilities, and $8.6 million for capital equipment that was accrued to accounts payable. These amounts accrued for capital equipment purchases have been excluded from the consolidated statements of cash flows for the three months ended December 29, 2017, and are expected to be paid in subsequent periods.