Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Accounting Policies [Abstract]
Amortization of intangible assets	$ 5,695	$ 3,048	$ 31
Amortization of intangible assets to be recognized in 2026	7,624
Amortization of intangible assets to be recognized in 2027	6,791
Amortization of intangible assets to be recognized in 2028	4,908
Amortization of intangible assets to be recognized in 2029	1,215
Amortization of intangible assets to be recognized in 2030	126
Amortization of intangible assets to be recognized thereafter	$ 297