Supporting Financial Information - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 4.1	$ 4.1
Intangible assets, remaining amortization period	7 years 1 month 6 days
Depreciation	$ 0.2	$ 0.1
Customer contracts and related customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining amortization period	7 years 1 month 6 days
Backlog
Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining amortization period	7 years 1 month 6 days
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining amortization period	7 years 6 months
Covenants-not-to-compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining amortization period	5 years 3 months 18 days