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Equity (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 24, 2019 USD ($) | May 24, 2018 shares | May 08, 2018 $ / shares shares | Apr. 23, 2018 shares | Jun. 30, 2019 $ / shares shares | Jun. 30, 2019 $ / shares shares | Sep. 30, 2018 $ / shares shares
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 10,000,000 | 10,000,000 | 10,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001
Preferred stock, shares issued (in shares) |  |  |  |  | 0 | 0 | 0
Preferred stock, shares outstanding (in shares) |  |  |  |  | 0 | 0 | 0
Common stock, shares outstanding (in shares) |  |  | 11,250,000 |  |  |  | 39,464,619
Treasury stock, shares (in shares) |  |  |  |  | (2,922,952) | (2,922,952) |
Non-employee Director |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |
Amount of limit of dollar value of equity-based awards | $ | $ 750 |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  | 25.2 |  |  | 25.2
Conversion of stock, shares issued (in shares) |  |  | 2,250,000 | 41,817,537 |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 100,000,000 | 100,000,000 | 100,000,000
Common stock, shares issued (in shares) |  |  |  |  | 22,162,369 | 22,162,369 | 42,387,571
Common stock, shares outstanding (in shares) |  |  |  |  | 19,239,417 | 19,239,417 | 39,464,619
Treasury stock, shares (in shares) |  |  |  |  | (2,922,952) | (2,922,952) | (2,922,592)
Average cost of treasury shares (in dollars per share) | $ / shares |  |  |  |  |  | $ 5.34 | $ 5.34
Conversion rate |  |  |  |  | 1 |  |
Class B Common Stock | Treasury Stock |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |
Conversion of stock, shares issued (in shares) |  |  |  | 3,170,034 |  |  |
Class A Common Stock |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  | 350,000 |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 400,000,000 | 400,000,000 | 400,000,000
Common stock, shares issued (in shares) |  |  |  |  | 32,442,545 | 32,442,545 | 11,950,000
Common stock, shares outstanding (in shares) |  |  | 9,000,000 |  | 32,442,545 | 32,442,545 | 11,950,000
Class A Common Stock | Restricted Stock |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |
Number of shares awarded (in shares) |  |  |  |  | 267,343 | 267,343 |
Class A Common Stock | IPO |  |  |  |  |  |  |
Schedule Of Stockholders Equity [Line Items] |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  | 700,000 |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  | $ 12.00 |  |  |  |

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