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Sale of businesses (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jan. 31, 2020
Impairment of assets sold |  |  | $ 12,601 | $ 37,902 |  |
AURELIUS Group [Member] |  |  |  |  |  |
Loss (gain) on sale of disposal group | $ (515) | $ 515 |  |  |  |
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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