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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, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 1,242,564 $ 1,235,962 $ 1,223,304 $ 1,185,720 $ 1,166,504 $ 1,160,290 $ 1,145,271 $ 1,104,632 $ 4,887,550 $ 4,576,697 $ 4,288,640
Managed services arrangements [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 2,856,621 2,755,486 2,546,330
Other [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 2,030,929 $ 1,821,211 $ 1,742,310