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Selected Quarterly Results of Operations - Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ 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
 [2]
Sep. 30, 2024
Sep. 30, 2023
Quarterly Financial Information Disclosure [Abstract]                      
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 [1] $ 5,004,989 $ 4,887,550
Operating income 132,625 202,470 197,735 198,834 112,674 175,868 155,732 184,334 731,664 628,608 653,990
Net Income (Loss) $ 96,327 $ 154,001 $ 163,243 $ 151,133 $ 86,441 $ 140,289 $ 118,502 $ 147,965 $ 564,704 $ 493,197 $ 540,709
Basic earnings per share $ 0.88 $ 1.39 $ 1.46 $ 1.34 $ 0.76 $ 1.22 $ 1.02 $ 1.27 $ 5.08 $ 4.27 $ 4.52
Diluted earnings per share $ 0.88 $ 1.39 $ 1.45 $ 1.33 $ 0.76 $ 1.21 $ 1.01 $ 1.26 $ 5.05 $ 4.25 $ 4.49
[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".