Summary of Significant Accounting Policies - Property and Equipment (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($) property	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation expense related to PP&E | $	$ 5,856	$ 1,665	$ 1,071
Discontinued Operations, Held-for-Sale
Property, Plant and Equipment [Line Items]
Number of property, held for sale | property	1
Building | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Building | Maximum
Property, Plant and Equipment [Line Items]
Useful life	30 years
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	30 years
Capitalized software costs | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Capitalized software costs | Maximum
Property, Plant and Equipment [Line Items]
Useful life	5 years