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Consolidated Statements of Financial Position (Parenthetical)
Sep. 30, 2024
$ / shares
shares
Sep. 30, 2024
€ / shares
shares
Sep. 30, 2023
$ / shares
shares
Sep. 30, 2023
€ / shares
shares
Ordinary shares, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01  
Ordinary shares authorized (in shares) 2,000,000,000.0 2,000,000,000.0 2,000,000,000.0 2,000,000,000.0
Ordinary shares issued (in shares) 692,964,542 692,964,542 709,968,796 709,968,796
Preferred shares, par or stated value per share (in dollars per share) | $ / shares $ 0.01   $ 0.01  
Preferred shares authorized (in shares) 200,000,000 200,000,000 200,000,000 200,000,000
Preferred shares outstanding (in shares) 0 0 0 0
Ordinary shares held in treasury (in shares) 30,086,539 30,086,539 29,596,724 29,596,724
Common Class A        
Ordinary shares, par value (in dollars per share) | € / shares   € 1.00   € 1.00
Ordinary shares authorized (in shares) 40,000 40,000 40,000 40,000
Ordinary shares outstanding (in shares) 0 0 0 0