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Technical Packaging Divestiture (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 subsidiary | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
After-tax gain on the sale of business |  |  | $ 77,116 |
Working capital adjustment |  | $ 200 |  |
Technical Packaging Business | Discontinued Operations Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net sales |  |  | 16,500 | $ 86,900
Pretax (loss) earnings |  |  | (300) | $ 4,300
Proceeds from sale of discontinued operations |  |  | 184,000 |
After-tax gain on the sale of business |  |  | $ 76,500 |
Technical Packaging Business | Sonoco Products Company | Discontinued Operations Disposed of by Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number Of Wholly Owned Subsidiaries of the Company | subsidiary | 2 |  |  |

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