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Business Segment Information - Schedule of Long-Lived Assets by Geographical Areas (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 7,865,832 $ 7,135,131 $ 6,942,376