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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 1,087,309 $ 1,066,254 $ 1,048,734 $ 1,086,343 $ 1,052,948 $ 1,026,201 $ 1,047,933 $ 1,041,957 $ 4,288,640 $ 4,169,039 $ 4,086,669
Operating income 154,330 154,919 149,244 140,200 146,938 147,531 156,712 143,577 598,693 594,758 569,746
Net income $ 123,525 $ 146,150 $ 119,067 $ 299,632 $ 134,463 $ 120,407 $ 127,038 $ 115,932 $ 688,374 [1] $ 497,840 [1] $ 479,446 [1]
Basic earnings per share $ 0.98 $ 1.15 $ 0.92 $ 2.29 $ 1.02 $ 0.90 $ 0.95 $ 0.86 $ 5.36 $ 3.73 $ 3.49
Diluted earnings per share $ 0.97 $ 1.14 $ 0.91 $ 2.28 $ 1.01 $ 0.90 $ 0.94 $ 0.85 $ 5.32 $ 3.71 $ 3.47
[1] In fiscal years 2021, 2020 and 2019, all of the Company’s net income is attributable to Amdocs Limited as the net income attributable to the Non-controlling interests is negligible.