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Segment Information and Sales to Significant Customers - Summary of Revenue by Nature of Activities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 1,166,504 $ 1,160,290 $ 1,145,271 $ 1,104,632 $ 1,087,309 $ 1,066,254 $ 1,048,734 $ 1,086,343 $ 4,576,697 $ 4,288,640 $ 4,169,039
Managed services arrangements [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 2,755,486 2,546,330 2,398,691
Other [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 1,821,211 $ 1,742,310 $ 1,770,348