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Intangible Assets - Information About Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Intangible Assets Net Excluding Goodwill [Abstract]    
Customer relationship $ 43,800 $ 43,800
Accumulated amortization (37,008) (35,768)
Net carrying value $ 6,792 $ 8,032