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Stockholders' / Members' Equity and Redeemable Class A Units (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 10, 2019 | Jun. 25, 2018 | Sep. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018
Class of Stock [Line Items] |  |  |  |  |
Preferred Stock authorized (shares) |  | 10,000,000 |  | 10,000,000 | 10,000,000
Preferred Stock, par value (in USD per share) |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001
Mezzanine Warrants |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Warrants outstanding (shares) |  |  | 1,423,688 |  |
IPO |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares issued (shares) |  | 7,647,500 |  |  |
Unsecured Debt | Junior Subordinated Notes |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Warrants outstanding (shares) |  |  | 1,433,920 |  |
Intrinsic value of warrants |  |  | $ 0 |  |
Warrant exercise price (in USD per share) |  |  | $ 2.095 |  |
Class A Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock authorized (shares) |  | 150,000,000 |  | 150,000,000 | 150,000,000
Common Stock, par value (in USD per share) |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001
Shares issued (shares) | 5,165,527 |  |  |  |
Units issued (shares) |  |  | 13,892,129 |  |
Units outstanding (shares) |  |  | 13,892,129 |  |
Cumulative preferred return |  | $ 7,627 |  |  | $ 5,105
Distributions to unit holders |  |  | $ 625 |  |
Common Stock issued (shares) |  |  |  | 14,444,115 | 9,112,042
Common Stock, outstanding (shares) |  |  |  | 14,444,115 | 9,112,042
Class B Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock authorized (shares) |  | 40,000,000 |  | 40,000,000 | 40,000,000
Common Stock, par value (in USD per share) |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001
Common Stock issued (shares) |  |  |  | 12,921,637 | 17,213,806
Common Stock, outstanding (shares) |  |  |  | 12,921,637 | 17,213,806
Redeemable Class A Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Units issued (shares) |  |  | 4,900,000 |  |
Units outstanding (shares) |  |  | 4,900,000 |  |
Annual preferred return rate (percent) |  |  | 10.00% |  |
Cumulative preferred return |  | $ 3,376 |  |  | $ 2,823
Distributions to unit holders |  |  | $ 131 |  |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock issued (shares) |  |  | 1,548,722 |  |
Common Stock, outstanding (shares) |  |  | 1,548,722 |  |
Restricted Class P Units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common Stock issued (shares) |  |  | 7,647,350 |  |
Common Stock, outstanding (shares) |  |  | 7,647,350 |  |

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- Definition Aggregate amount of redemption requirements for each class or type of redeemable stock classified as temporary equity for each of the five years following the latest balance sheet date. The redemption requirement does not constitute an unconditional obligation that will be settled in a variable number of shares constituting a monetary value predominantly indexed to (a) a fixed monetary amount known at inception, (b) an amount inversely correlated with the residual value of the entity, or (c) an amount determined by reference to something other than the fair value of issuer's stock. Does not include mandatorily redeemable stock. The exception is if redemption is required upon liquidation or termination of the reporting entity. + References No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: 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(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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