Intangible Assets, Net (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 31, 2021	Sep. 30, 2021
Intangible Assets, Net [Line Items]
Weighted average cost of capital assumption	9.40%
Assumed annual compound growth rate after five years	3.37%
Assumed annual compound growth rate period	5 years
Disposal Groups [Member]
Intangible Assets, Net [Line Items]
Impairment of intangible assets, Indefinite-lived		$ 200