Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 1,100,000	$ 1,000,000	$ 3,000,000	$ 2,900,000
Impairment of long-lived assets	0		0
Sierra Acquisition
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 5,400,000		$ 5,400,000