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Business (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jul. 01, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Redemption Value |  | $ 40,977 |  | $ 40,977 |  |  |  |
Accounting Standards Update and Change in Accounting Principle |  |  |  | In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (“ASU 2021-08”). This standard amends the existing guidance under ASC 805 to add contract assets and contract liabilities to the list of exceptions to the recognition and measurement principles that apply to business combinations. Under this standard, the acquirer of a business is expected to recognize and measure acquired contract assets and contract liabilities as if the acquirer entered into the original contract on the same date with the same terms in accordance with ASC 606 rather than at fair value on the date of acquisition. This update is effective for fiscal years beginning after December 15, 2022 and for interim periods within that year. We adopted this standard on October 1, 2023 using the prospective method. ASU 2021-08 impacts how we account for business combinations completed after its adoption. Recent Accounting Pronouncements and Disclosure Rules Not Yet Adopted In November 2023, the FASB issued Accounting Standard Update No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”). This standard requires disclosure of significant segment expenses, other segment items, and additional information about the chief operating decision maker (“CODM”). This update is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted, and retrospective application is required. We are evaluating the impact this update will have on our annual disclosures; however, it will not impact our financial condition, results of operations, or cash flows. In December 2023, the FASB issued Accounting Standard Update No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”). This standard requires more detailed disclosure within the tax rate reconciliation table, as well as additional information about cash taxes paid. This update is effective for fiscal years beginning after December 15, 2024. Early adoption is permitted. We are evaluating the impact this update will have on our annual disclosures; however, it will not impact our financial condition, results of operations, or cash flows. In November 2024, the FASB issued Accounting Standard Update No. 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”). This standard requires additional disclosures of certain expenses, including purchases of inventory, employee compensation, depreciation, intangible asset amortization, and other specific expense categories. This standard also requires disclosure of the total amount of selling expenses and the Company's definition of selling expenses. This update is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. We are evaluating the impact this update will have on our annual disclosures; however, it will not impact our financial condition, results of operations, or cash flows. |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest |  |  |  | $ 0 | $ (32,000) |  |  |
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest |  | 2,057 | $ 4,539 | 5,375 | 11,062 |  |  |
Payments to Noncontrolling Interests |  |  |  | (7,536) | (14,474) |  |  |
Noncontrolling Interest, Change in Redemption Value |  | 560 |  | 2,142 | 21,260 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent |  |  |  | 0 | 3,120 |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount |  | $ 40,977 | $ 38,919 | $ 40,977 | $ 38,919 |  | $ 40,996 | $ 49,951
Bayonet |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 20.00% | 20.00% |  | 20.00% |  |  |  |
Subsidiary, Ownership Percentage, Parent |  | 80.00% |  | 80.00% |  |  |  |
Edmonson Electric |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  | 20.00% |  | 20.00% |  | 20.00% |  |
Subsidiary, Ownership Percentage, Parent |  | 80.00% |  | 80.00% |  |  |  |
NEXT Electric |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner |  | 20.00% |  | 20.00% |  |  |  |
Subsidiary, Ownership Percentage, Parent |  | 80.00% |  | 80.00% |  |  |  |
Bayonet |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest | $ (32,000) |  |  |  |  |  |  |

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