Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Service cost	$ 284	$ 261
Interest cost	79	68
Expected return on plan assets	(87)	(30)
Amortization of actuarial losses	264	236
Pension expense for defined benefit plans	$ 540	$ 535