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Discontinued Operations and Disposals - Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Reversal of allowance for doubtful accounts, net | $ (32) | $ 44 | $ 24
Loss on sale of subsidiary |  |  | (13,709)
Tempress and SoLayTec | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Loss from discontinued operations, net of tax |  |  | (11,816)
Depreciation and amortization |  |  | 180
Reversal of allowance for doubtful accounts, net |  |  | (62)
Loss on sale of subsidiary |  |  | (10,916)
Purchases of property, plant and equipment |  |  | $ 1

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