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Business Acquisitions - 2023 Acquisition (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jun. 08, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2025 | Jun. 07, 2024 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from employees for share purchases |  |  |  | $ 0 | $ 3,253 |  |  |
Hisco |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Preliminary purchase price | $ 267,200 |  |  |  |  |  |  |
Cash acquired from acquisition | 12,200 |  |  |  |  |  |  |
Cash exchanged for equity related to retention bonuses | $ 37,500 |  |  |  |  |  |  |
Retention bonuses |  |  |  | 34,600 |  |  |  | $ 1,800
Retention bonuses compensation expense |  | $ 200 | $ 10,100 | $ 16,200 | $ 12,400 |  |  |
Price per share (in dollars per share) | $ 22.50 |  | $ 22.50 |  | $ 22.50 |  |  |
Maximum stock employees can purchase | $ 25,000 |  |  |  |  |  |  |
Stock sold (in shares) |  |  | 144,608 |  |  |  |  |
Proceeds from employees for share purchases |  |  | $ 3,300 |  |  |  |  |
Increase in goodwill |  |  |  |  |  |  | $ 122 |
Compensation expense |  |  | $ 400 |  |  |  |  |
Total purchase consideration exchanged, net of cash acquired, measurement period adjustments |  |  |  |  |  |  | $ 3,269 |
Expected tax deductible goodwill amount |  |  |  |  |  |  |  | $ 41,400
Hisco | Forecast |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash exchanged for equity related to retention bonuses |  |  |  |  |  | $ 1,100 |  |
Hisco | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Useful life (in years) |  | 12 years |  | 12 years |  |  |  |
Hisco | Trade names |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Useful life (in years) |  | 8 years |  | 8 years |  |  |  |

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