Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Service cost	$ 261	$ 217
Interest cost	68	119
Expected return on plan assets	(30)	(30)
Amortization of actuarial losses	236	96
Pension expense for defined benefit plans	$ 535	$ 402