Defined Benefit Pension Plan - Qualified Defined Benefit Pension Plan, Net of Taxes, and the Related Foreign Currency Translation Adjustments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Accumulated OCI
Accumulated other comprehensive (loss) income at beginning of year	$ (1,662)	$ (1,094)
Net actuarial loss	(312)	(339)
Foreign currency translation adjustments	(596)	(230)
Accumulated other comprehensive (loss) at end of year	$ (2,570)	$ (1,662)