Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019
Retirement Benefits [Abstract]
Defined Contribution Plan, Cost	$ 2,326	$ 2,144	$ 1,895
Liability, Defined Benefit Plan	719	738
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	$ 41	$ 42	$ 0
Defined Benefit Plan, Funded Percentage				83.32%