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Sale of businesses (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Impairment of assets sold |  | $ 37,902 |
Promissory note due date | Apr. 30, 2022 |  |
Disposal Groups [Member] |  |  |
Non-cash impairment charge |  | 22,900 |
Impairment of assets sold |  | $ 37,902 |
Disposal Groups [Member] | AURELIUS Group [Member] |  |  |
Purchase price | $ 23,400 |  |
Promissory note | $ 6,000 |  |
Disposal Groups [Member] | AURELIUS Group [Member] | Germany, Poland And Bulgaria [Member] |  |  |
Sales |  |  | $ 88,000

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