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Sale of businesses (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jan. 31, 2020
Impairment of assets sold (Note 10)		$ 37,902
AURELIUS Group [Member]
Loss on sale of disposal group	$ 2,540
Disposal Groups [Member]
Non-cash impairment charge		22,900
Impairment of assets sold (Note 10)		$ 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			$ 80,000