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Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020
Property, Plant and Equipment [Line Items]
Equipment	$ 50,039	$ 67,530
Computer software	141,978	130,565
Leasehold improvements	1,727	1,723
Furniture and fixtures	588	450
Property, plant and equipment, gross	194,332	200,268
Less accumulated depreciation	(163,503)	(170,207)
Net	30,829	30,061
Telephone Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,438	4,563
Less accumulated depreciation	(2,071)	(1,021)
Net	$ 5,367	$ 3,542

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