Stockholders' Equity - Schedule of As-Converted Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Stockholders' Equity Note [Abstract]
Reduction in equivalent number of as-converted shares of class A common stock (in shares)	0	2
Effective price per share (in dollars per share)	$ 0	$ 209.14
Deposits into the U.S. litigation escrow account	$ 0	$ 350