Basis of Presentation	9 Months Ended
Jul. 04, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying Condensed Consolidated Financial Statements included herein have been prepared by Plexus Corp. and its subsidiaries (together “Plexus” or the “Company”) without audit and pursuant to the rules and regulations of the United States (“U.S.”) Securities and Exchange Commission (“SEC”). The accompanying Condensed Consolidated Financial Statements reflect all adjustments, which include normal recurring adjustments necessary for the fair statement of the condensed consolidated financial position of the Company as of July 4, 2026 and September 27, 2025, the results of operations and shareholders' equity for the three and nine months ended July 4, 2026 and June 28, 2025, and the cash flows for the same nine month periods. The Company’s fiscal year ends on the Saturday closest to September 30. The Company also uses a "4-4-5" weekly accounting system for the interim periods in each quarter. Each quarter, therefore, ends on a Saturday at the end of the 4-4-5 period. Periodically, an additional week must be added to the fiscal year to re-align with the Saturday closest to September 30. The first quarter of fiscal 2026 included 14 weeks while all other fiscal quarters presented herein included 13 weeks. Certain information and footnote disclosures, normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP"), have been condensed or omitted pursuant to the SEC’s rules and regulations dealing with interim financial statements. However, the Company believes that the disclosures made in the Condensed Consolidated Financial Statements included herein are adequate to make the information presented not misleading. It is suggested that these Condensed Consolidated Financial Statements be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s 2025 Annual Report on Form 10-K. The preparation of financial statements requires management to make estimates and assumptions that affect the amounts reported in the Condensed Consolidated Financial Statements and notes thereto. The full extent to which current global events and economic conditions will impact the Company's business and operating results will depend on future developments that are highly uncertain and cannot be accurately predicted. The Company has considered information available as of the date of issuance of these financial statements and is not aware of any specific events or circumstances that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities. These estimates may change as new events occur and additional information becomes available. Actual results could differ materially from these estimates. Recently Issued Accounting Pronouncements Not Yet Adopted: In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2023-09 Income Taxes (Topic 740), which requires enhanced disclosures for income taxes. Early adoption is permitted. The Company intends to adopt the guidance when it becomes effective in the fourth quarter of fiscal 2026. The Company is currently evaluating the impact that the updated standard will have on our financial statement disclosures. In November 2024, the FASB issued ASU 2024-03 Disaggregation of Income Statement Expense (Subtopic 220-40), which requires disaggregated information about certain income statement expense line items. The guidance is effective for the Company beginning in fiscal 2028. Early adoption is permitted. The Company is currently evaluating the impact that the updated standard will have on its financial statement disclosures. In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software, which removes references to project stages, and requires capitalization of software costs to begin when management has authorized and committed to funding the software project, and it is probable that the project will be completed and the software will be used to perform the intended function. The guidance is effective for fiscal years beginning after December 15, 2027, and interim periods within those annual reporting periods. The Company is currently evaluating the impact the adoption of the standard will have on its financial statement disclosures. The Company does not believe that any other recently issued accounting standards will have a material impact on its Consolidated Financial Statements or apply to its operations.

The accompanying Condensed Consolidated Financial Statements included herein have been prepared by Plexus Corp. and its subsidiaries (together “Plexus” or the “Company”) without audit and pursuant to the rules and regulations of the United States (“U.S.”) Securities and Exchange Commission (“SEC”). The accompanying Condensed Consolidated Financial Statements reflect all adjustments, which include normal recurring adjustments necessary for the fair statement of the condensed consolidated financial position of the Company as of July 4, 2026 and September 27, 2025, the results of operations and shareholders' equity for the three and nine months ended July 4, 2026 and June 28, 2025, and the cash flows for the same nine month periods.

The Company’s fiscal year ends on the Saturday closest to September 30. The Company also uses a "4-4-5" weekly accounting system for the interim periods in each quarter. Each quarter, therefore, ends on a Saturday at the end of the 4-4-5 period. Periodically, an additional week must be added to the fiscal year to re-align with the Saturday closest to September 30. The first quarter of fiscal 2026 included 14 weeks while all other fiscal quarters presented herein included 13 weeks.

Certain information and footnote disclosures, normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP"), have been condensed or omitted pursuant to the SEC’s rules and regulations dealing with interim financial statements. However, the Company believes that the disclosures made in the Condensed Consolidated Financial Statements included herein are adequate to make the information presented not misleading. It is suggested that these Condensed Consolidated Financial Statements be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s 2025 Annual Report on Form 10-K.

The preparation of financial statements requires management to make estimates and assumptions that affect the amounts reported in the Condensed Consolidated Financial Statements and notes thereto. The full extent to which current global events and economic conditions will impact the Company's business and operating results will depend on future developments that are highly uncertain and cannot be accurately predicted. The Company has considered information available as of the date of issuance of these financial statements and is not aware of any specific events or circumstances that would require an update to its estimates or judgments or a revision of the carrying value of its assets or liabilities. These estimates may change as new events occur and additional information becomes available. Actual results could differ materially from these estimates.

In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2023-09 Income Taxes (Topic 740), which requires enhanced disclosures for income taxes. Early adoption is permitted. The Company intends to adopt the guidance when it becomes effective in the fourth quarter of fiscal 2026. The Company is currently evaluating the impact that the updated standard will have on our financial statement disclosures.

In November 2024, the FASB issued ASU 2024-03 Disaggregation of Income Statement Expense (Subtopic 220-40), which requires disaggregated information about certain income statement expense line items. The guidance is effective for the Company beginning in fiscal 2028. Early adoption is permitted. The Company is currently evaluating the impact that the updated standard will have on its financial statement disclosures.

In September 2025, the FASB issued ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software, which removes references to project stages, and requires capitalization of software costs to begin when management has authorized and committed to funding the software project, and it is probable that the project will be completed and the software will be used to perform the intended function. The guidance is effective for fiscal years beginning after December 15, 2027, and interim periods within those annual reporting periods. The Company is currently evaluating the impact the adoption of the standard will have on its financial statement disclosures.

The Company does not believe that any other recently issued accounting standards will have a material impact on its Consolidated Financial Statements or apply to its operations.