Discontinued Operations, Goodwill, and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Sep. 30, 2021
Identifiable intangible assets with finite useful lives
Intangible Assets, Net	$ 50,174	$ 54,867
Minimum
Identifiable intangible assets with finite useful lives
Amortization Period	1 year
Maximum
Identifiable intangible assets with finite useful lives
Amortization Period	11 years
Customer Relationships
Identifiable intangible assets with finite useful lives
Gross Amount	$ 663,400	663,400
Accumulated Amortization	(613,200)	(608,500)
Intangible Assets, Net	$ 50,200	$ 54,900