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Allowance for Doubtful Accounts - Narrative (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023
Receivables [Abstract]
Allowance for doubtful accounts, deposits with and receivables from broker-dealers, clearings organizations, and counterparties	$ 0.0	$ 100,000
Allowance for doubtful accounts receivable	51,900,000	59,800,000
Allowance for doubtful accounts	$ 0	$ 0

X

- Definition

Allowance For Doubtful Accounts - Deposits With And Receivables From Broker-Dealers, Clearings Organizations, And Counterparties

+ References

No definition available.

+ Details

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X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(5))
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Topic 310
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-Topic 326
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-Paragraph 13
-Subparagraph (f)
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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-Name Accounting Standards Codification
-Section S99
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