Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Unrecognized tax benefits that would impact effective tax rate	$ 2,700
Income tax benefit specific to the period	(2,200)	$ 800
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	2,908
Decreases related to expiration of statute of limitations	(68)
Unrecognized tax benefits, ending balance	2,840
Maximum
Unrecognized tax benefits that would decrease next twelve months	$ 700