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Shareholders’ Equity - Initial Public Offering and Impact of Corporate Reorganization (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 26, 2018 USD ($) $ / shares shares | Jun. 22, 2018 USD ($) shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares | Jun. 22, 2018 GBP (£) shares
Class of Stock |  |  |  |  |  |
Proceeds of issuance of ordinary shares, net of issuance costs |  |  | $ 156,920,000 | $ 127,686,000 | $ 32,222,000 |
Payment of stock issuance cost | $ 16,000,000 |  |  |  |  |
Equity conversion ratio |  | 3.185 |  |  |  |
Shares outstanding (shares) | shares |  |  | 129,074,156 | 29,962,741 | 13,921,543 |
Ordinary shares |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Shares outstanding (shares) | shares |  |  | 40,146,182 |  |  |
Shares value |  |  | $ 2,000 | $ 1,000 |  |
Ordinary shares | IPO |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Number of shares issued in transaction (shares) | shares | 10,147,059 |  |  |  |  |
Per share price of issuance (usd per share) | $ / shares | $ 17.00 |  |  |  |  |
Proceeds of issuance of ordinary shares, net of issuance costs | $ 156,500,000 |  |  |  |  |
Deferred Shares |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Shares outstanding (shares) | shares |  | 34,425 | 34,425 |  |  | 34,425
Shares value |  | $ 1.00 | $ 0 | 0 |  |
Deferred B shares |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Shares outstanding (shares) | shares |  | 88,893,548 | 88,893,548 |  |  | 88,893,548
Shares value |  | $ 118,000 | $ 118,000 | 0 |  |
Share capital registration threshold | £ |  |  |  |  |  | £ 50,000
Deferred C shares |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Shares outstanding (shares) | shares |  |  | 1 |  |  |
Shares value |  | $ 1.00 | $ 0 | $ 0 |  |

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