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Stockholders' Equity - Schedule of As-Converted Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Equity [Abstract] |  |
Reduction in equivalent number of class A common stock (in shares) | 5 | 4
Effective price per share (in dollars per share) | $ 221.33 | $ 205.06
Deposits into the U.S. litigation escrow account | $ 1,000 | $ 850

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- Definition Deposits To Litigation Escrow Account + References No definition available. + Details
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