Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Cash paid for amounts included in operating lease liabilities	$ 3,437	$ 3,598
Cash paid for amounts included in finance lease liabilities	79	75
Non-cash: lease liabilities arising from new operating lease assets obtained	5,691	0
Non-cash: lease liabilities arising from new finance lease assets obtained	0	0
Non-cash: adjustments to lease assets and liabilities	$ 360	$ 408