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Discontinued Operations and Disposals - Additional Information (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 22, 2020 | Jun. 07, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain (Loss) on sale of subsidiary |  |  |  | $ (13,709) | $ 1,614
SoLayTec | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain (Loss) on sale of subsidiary |  | $ 1,600 |  |  |
R2D | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain (Loss) on sale of subsidiary |  |  |  | $ (2,800) |
Tempress | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Unsecured term loan, principal amount | $ 2,250 |  |  |  |
Pre-tax loss on sale | (10,900) |  |  |  |
Previously recorded accumulated foreign currency translation losses recognized | $ (7,200) |  |  |  |
Forgave unsecured term loans |  |  | $ 500 |  |

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