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Sale of businesses (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Impairment of assets sold |  | $ 37,902 |
Disposal Groups [Member] |  |  |
Non-cash impairment charge |  |  | $ 22,900
Impairment of assets sold | $ 37,902 |  |

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