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Balance Sheet Details - Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Balance Sheet Details [Abstract]    
Goodwill, Beginning Balance $ 2,259,282 $ 2,216,553
Goodwill, Acquired During Period 29,396 43,956
Goodwill, Other Increase (Decrease)   (1,227)
Goodwill, Ending Balance $ 2,288,678 $ 2,259,282