Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 259	$ 214	$ 779	$ 648
Interest cost	67	118	203	357
Expected return on plan assets	(30)	(30)	(89)	(90)
Amortization of actuarial losses	235	95	706	288
Pension expense for defined benefit plans	$ 531	$ 397	$ 1,599	$ 1,203