Goodwill and intangible assets (Details) - Schedule of indefinite-lived intangible assets - Products [Member] $ in Thousands	6 Months Ended
	Jan. 31, 2019 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Gross, Beginning Balance	$ 27,347
Accumulated Amortization, Beginning Balance	(25,461)
Net, Beginning Balance	1,886
Amortization expense, Accumulated Amortization	(494)
Amortization expense, Net	(494)
Foreign currency translation, Gross	(41)
Foreign currency translation, Accumulated Amortization	37
Foreign currency translation, Net	(4)
Gross, Ending Balance	27,306
Accumulated Amortization, Ending Balance	(25,918)
Net, Ending Balance	$ 1,388