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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, 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
Quarterly Financial Information Disclosure [Abstract]                      
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
Operating income 138,925 182,714 182,277 150,074 171,686 169,314 163,651 160,146 653,990 664,797 598,693
Net income $ 102,011 $ 159,428 $ 149,603 $ 129,667 $ 128,936 $ 128,466 $ 158,497 $ 133,602 $ 540,709 $ 549,501 $ 688,374
Basic earnings per share $ 0.86 $ 1.33 $ 1.24 $ 1.07 $ 1.06 $ 1.05 $ 1.29 $ 1.07 $ 4.52 $ 4.47 $ 5.36
Diluted earnings per share $ 0.86 $ 1.32 $ 1.23 $ 1.07 $ 1.05 $ 1.04 $ 1.28 $ 1.07 $ 4.49 $ 4.44 $ 5.32