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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life |  |  |  | 3 years
Impairment of intangible assets, finite-lived |  | $ 0 | $ 0 | $ 75,000,000
Finite-lived trademarks and tradenames, gross |  |  |  | 8,000,000
Accumulated impairment losses |  | 0 | 0 |
Provision for goodwill or other intangible asset impairments |  | $ 0 | $ 0 | $ 0
Trademarks and tradenames |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life | 3 years |  |  |
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 |  |

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- Definition 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 -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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