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Discontinued Operations, Goodwill, and Intangible Assets - Intangible assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Discontinued Operations, Goodwill and Intangible Assets
Intangible Assets, Net	$ 17,769	$ 35,552
Customer relationships
Discontinued Operations, Goodwill and Intangible Assets
Gross Amount	663,800	663,000
Accumulated Amortization	(646,000)	(627,400)
Intangible Assets, Net	$ 17,800	$ 35,600
Customer relationships | Minimum
Discontinued Operations, Goodwill and Intangible Assets
Amortization Period	1 year
Customer relationships | Maximum
Discontinued Operations, Goodwill and Intangible Assets
Amortization Period	11 years

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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