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Intangible Assets - Information About Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Intangible Assets Net Excluding Goodwill [Abstract]    
Customer relationship $ 43,800 $ 43,800
Accumulated amortization (35,393) (34,268)
Total $ 8,407 $ 9,532