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Consolidated Statements of Cash Flows (Parenthetical) - Senior Notes | Sep. 30, 2023 | Sep. 30, 2022 | Aug. 13, 2021 | Mar. 17, 2021
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Senior Notes due 2031 – 4.000% |  |  |  |
Interest rate (percent) | 4.00% | 4.00% |  | 4.00%
Senior Notes due 2032 – 4.375% |  |  |  |
Interest rate (percent) | 4.375% | 4.375% | 4.375% |

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