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Business Combination - Narrative (Details) - USD ($) $ in Thousands, shares in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 08, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Business Acquisition [Line Items] |  |  |
Borrowings |  | $ 168,000 | $ 17,000
Issuance and fair value adjustment of common stock in business combination |  | 6,539 |
GRSI |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of equity interest acquired | 10000.00% |  |
Purchase price | $ 187,997 |  |
Borrowings | 181,500 |  |
Issuance and fair value adjustment of common stock in business combination | 6,500 |  |
Escrow funds | $ 4,300 |  |
Revenue contributed since the acquisition date |  | 107,000 |
Income from operations contributed since the acquisition date |  | 4,400 |
Non-cash intangible asset amortization expense |  | $ 8,200 |
GRSI | Common Stock |  |  |
Business Acquisition [Line Items] |  |  |
Issuance of common stock in business combination (in shares) | 0.5 |  |

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