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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Useful life		3 years
Impairment of intangible assets, finite-lived	$ 0	$ 75,000,000.0	$ 0
Finite-lived trademarks and tradenames, gross		7,900,000
Accumulated impairment losses	0	0
Provision for goodwill or other intangible asset impairments	$ 0	$ 0	$ 0
Customer relationships, noncompete agreements, and other
Finite-Lived Intangible Assets [Line Items]
Useful life	15 years
CMG | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Useful life	35 years

X

- Definition

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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Amount before 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
-Publisher FASB
-Name Accounting Standards Codification
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