Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Retirement Benefits [Abstract]
Service cost	$ 287	$ 259	$ 858	$ 779
Interest cost	81	67	240	203
Expected return on plan assets	(88)	(30)	(262)	(89)
Amortization of actuarial losses	266	235	640	706
Pension expense for defined benefit plans	$ 546	$ 531	$ 1,476	$ 1,599