Property, Plant, and Equipment (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Property, Plant and Equipment [Line Items]
Disposal of property, plant and equipment	$ 23,900	$ 16,900
Depreciation expense	17,100	20,000
Telephone Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 1,100	$ 600