Goodwill and intangible assets (Details) - Schedule of Indefinite-Lived Intangible Assets $ in Thousands	3 Months Ended
	Oct. 31, 2020 USD ($)
Schedule of Indefinite-Lived Intangible Assets [Abstract]
Gross, Beginning Balance	$ 27,686
Accumulated Amortization, Beginning Balance	(27,148)
Net, Beginning Balance	538
Amortization expense, Gross
Amortization expense, Accumulated Amortization	(75)
Amortization expense, Net	(75)
Foreign currency translation, Gross	(64)
Foreign currency translation, Accumulated Amortization	61
Foreign currency translation, Net	(3)
Gross, Ending Balance	27,622
Accumulated Amortization, Ending Balance	(27,162)
Net, Ending Balance	$ 460