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Segment Information and Sales to Significant Customers - Summary of Revenue by Geographic Area (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 1,002,588 $ 1,002,198 $ 992,340 $ 977,711 $ 979,724 $ 966,695 $ 966,009 $ 954,727 $ 3,974,837 $ 3,867,155 $ 3,718,229
North America [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 2,550,234 2,546,290 2,381,122
Europe [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 572,196 488,932 513,295
Rest of the World [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 852,407 $ 831,933 $ 823,812