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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