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Allowance for Doubtful Accounts - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for doubtful accounts - deposits with and receivables from broker-dealers, clearings organizations, and counterparties | $ 1,300,000 | $ 1,300,000 |
Allowance for doubtful accounts receivable | 38,500,000 | 25,800,000 |
Allowance for doubtful accounts | 0 | 0 |
Accounts receivable, allowance for doubtful accounts | 5,900,000 | 35,600,000 | $ 300,000
Provision for bad debts, net of recoveries and impairment | 10,400,000 | 13,000,000 | 2,500,000
Bad debt expense (recovery) | 0 | 0 | (12,400,000)
Net increase in provision for bad debts |  |  | 2,600,000
Allowance for doubtful accounts receivable, recoveries |  |  | 400,000
Commerical Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for bad debts, net of recoveries and impairment | 8,500,000 | 3,500,000 |
Bad debt expense (recovery) | 4,600,000 | 3,200,000 |
Net increase in provision for bad debts |  |  | 2,700,000
Institutional Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for bad debts, net of recoveries and impairment | 600,000 | 5,400,000 |
Net increase in provision for bad debts |  |  | $ 1,400,000
Global Payments |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for bad debts, net of recoveries and impairment | 200,000 |  |
Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Provision for bad debts, net of recoveries and impairment | $ 1,100,000 | $ 600,000 |

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- 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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