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Acquisitions - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) business shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Net tangible assets acquired |  |  |  |  |  | $ 189,800
Intangible assets |  |  |  |  |  | 115,500
Goodwill |  |  |  |  |  | 317,200
Cash payment for contingent consideration liabilities |  |  |  | $ 5,000 | $ 1,600 |
Acquisitions 2023 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of businesses acquired | business |  |  |  | 4 |  |
Cash consideration |  |  |  | $ 484,103 |  |
Number of shares granted for acquired companies (in shares) | shares |  |  |  | 1,062,408 |  |
Value of Quanta common stock issued |  |  |  | $ 131,521 |  |
Intangible assets |  |  |  | 115,515 |  |
Goodwill expected to be deductible for income tax |  | $ 261,300 |  | 261,300 |  | 261,300
Revenues included in consolidated results of operations |  | 117,400 |  | 354,000 |  |
Income (loss) before taxes |  | 3,500 |  | 300 |  |
Amortization expense |  | 7,300 |  | 22,300 |  |
Acquisition costs |  | 1,800 |  | 19,600 |  |
Consideration transferred |  |  |  | 622,474 |  |
Acquisitions 2022 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenues included in consolidated results of operations |  |  | $ 5,100 |  | 5,100 |
Income (loss) before taxes |  |  | 200 |  | 200 |
Amortization expense |  |  | 700 |  | 700 |
Acquisition costs |  |  | $ 600 |  | $ 600 |
Acquisitions, Multiple Periods |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration payments (up to) |  | $ 336,600 |  | $ 336,600 |  | $ 336,600
Manufacturer Of Power Transformers | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 300,000 |  |  |  |  |

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