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Segment Information and Revenue from Significant Customers - Summary of Revenue by Nature of Activities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2025
 [1]
Sep. 30, 2024
Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue $ 1,150,218 $ 1,144,437 $ 1,128,203 $ 1,110,055 $ 1,263,882 $ 1,250,059 $ 1,245,849 $ 1,245,199 $ 4,532,913 [2] $ 5,004,989 $ 4,887,550
Managed services arrangements [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 2,995,763 2,904,924 2,856,621
Others [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenue                 $ 1,537,150 $ 2,100,065 $ 2,030,929
[1] During the first quarter of fiscal year 2025, the Company phased out several low-margin, non-core business activities, which were included in fiscal year 2024, for more details see ‘Item 5. Operating and Financial Review and Prospects’. Excluding the phase out, the percentage of revenue of customer 1 and customer 2 for fiscal year 2025 remained roughly stable as compared to fiscal year 2024.
[2] or further details see Note 22 "Segment Information and Revenue from Significant Customers".