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Goodwill and Intangible Assets, Net - Details of Total Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill, Beginning Balance $ 1,925,225 $ 1,818,334
Goodwill resulting from acquisitions 123,987 100,935
Other (119) 5,956
Goodwill, Ending Balance $ 2,049,093 $ 1,925,225