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Intangible Assets, Net (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2020
Sep. 30, 2020
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted average cost of capital assumption 8.50%  
Assumed annual compound growth rate after five years 3.44%  
Assumed annual compound growth rate period 5 years  
Disposal Groups [Member]    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Impairment of intangible assets, Indefinite-lived   $ 200