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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