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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets Amortization Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Intangible Assets Net Excluding Goodwill [Abstract]      
Amortization expense $ 39,458 $ 56,022 $ 44,742