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Significant Non-cash Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Other Significant Noncash Transactions [Line Items] |  |  |
Debt converted to shares issued | $ 0 | $ 8,054 | $ 0
Equity issued as part of acquisitions' purchase consideration | 0 | 104 | 275
Acquisition date fair value of contingent consideration in connection with business combinations | 13,032 | 2,084 | 1,221
Replacement of prior Senior Secured Credit Facility with Senior Secured Credit Facility | 100,229 | 87,525 | 0
Mezzanine Notes net settled with Mezzanine Warrant exercises | 0 | 14 | 0
Unsecured notes payable to related and unrelated creditors net settled with Junior Subordinated Notes Warrants | 0 | 2,565 | 0
Settlement of warrant liability with equity as a result of Mezzanine Warrant exercise | 0 | 9,253 | 0
Preferred return on Class A Units and Redeemable Class A Units |  |  | 756
Debt issuance costs financed with proceeds from Senior Secured Credit Facility | 1,271 | 904 | 0
Redeemable Class A Common Stock |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Preferred return on Class A Units and Redeemable Class A Units | 0 | 552 | 701
Class A Common Stock |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Preferred return on Class A Units and Redeemable Class A Units | 0 | 2,522 | 2,223
Restricted Stock |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Equity issued as part of acquisitions' purchase consideration | 225 | 550 | 0
Junior Subordinated Notes |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Debt converted to shares issued | $ 0 | $ 0 | $ 500

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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