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Receivables From Customers, Net and Notes Receivable, Net (Notes) | 3 Months Ended
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Dec. 31, 2018
Receivables from customers and notes receivable, net [Abstract] |
Financing Receivables [Text Block] | Allowance for Doubtful Accounts The allowance for doubtful accounts related to receivables from clients was $11.3 million and $10.2 million as of December 31, 2018 and September 30, 2018, respectively. The allowance for doubtful accounts related to deposits with and receivables from broker-dealers, clearing organizations, and counterparties was $45.6 million and $48.0 million, as of December 31, 2018 and September 30, 2018, respectively. During the three months ended December 31, 2018, the Company recorded bad debt expense of $0.3 million. Additionally, during the three months ended December 31, 2018, the Company reached settlements with clients, paying $8.4 million related to demurrage, dead freight, and other penalty charges regarding coal supplied during fiscal 2017. The settlement amount paid was less than the accrued liability for the transactions recorded during fiscal 2017 and fiscal 2018, and accordingly the Company recorded a recovery on the bad debt on physical coal of $2.4 million in the three months ended December 31, 2018. During the three months ended December 31, 2017, the Company recorded bad debt expense of $0.1 million. Additionally, within the Company’s Physical Commodities segment, it recorded an additional provision of $1.0 million related to the bad debt on physical coal for amounts due to the Company from a coal supplier for demurrage and other charges related to contracts with delivery dates subsequent to September 30, 2017.

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- Definition Receivables from customers and notes receivable, net [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for financing receivables. Examples of financing receivables include, but are not limited to, loans, trade accounts receivables, notes receivable, credit cards, and receivables relating to a lessor's right(s) to payment(s) from a lease other than an operating lease that is recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -URI http://asc.fasb.org/topic&trid=2196771 + Details
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