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Balance Sheet Details - Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Balance Sheet Details [Abstract]    
Goodwill, Beginning Balance $ 2,216,553 $ 1,858,966
Goodwill, Acquired During Period 43,956 351,417
Goodwill, Other Increase (Decrease) (1,227) 6,170
Goodwill, Ending Balance $ 2,259,282 $ 2,216,553