| Intangibles - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023 | 
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Intangible assets, gross | $ 33,889 | $ 31,130 | 
| Less: Accumulated amortization | (6,947) | (4,562) | 
| Total intangibles, net | 26,942 | 26,568 | 
| Intangible assets - Tradenames | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Intangible assets, gross | 14,940 | 14,940 | 
| Intangible assets - Customer relationships | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Intangible assets, gross | 15,139 | 13,874 | 
| Intangible assets - Other | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Intangible assets, gross | $ 3,810 | $ 2,316 | 
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