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Cash and Credit Facilities - Summary of Loan Facilities and Subordinated Debt Financing (Details) - Secured Debt - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018
Debt Instrument [Line Items] |  |
Total bank debt obligation | $ 56,000,000 | $ 7,708,000
Term loan |  |
Debt Instrument [Line Items] |  |
Secured term loan, face amount | 70,000,000 |
Total bank debt obligation | $ 56,000,000 |
Term loan | LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 2.10% |
Debt instrument, basis spread on variable rate | 4.00% |
Revolving Line of Credit |  |
Debt Instrument [Line Items] |  |
Secured revolving line of credit, ceiling | $ 25,000,000 |
Total bank debt obligation | $ 0 |
Revolving Line of Credit | LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 2.10% |
Debt instrument, basis spread on variable rate | 4.00% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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