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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill, Beginning Balance $ 2,221,209 $ 2,211,639
Goodwill resulting from acquisitions 227,283 18,535
Other (3,597) (8,965)
Goodwill, Ending Balance $ 2,444,895 $ 2,221,209