Share-based Compensation - Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details)	6 Months Ended
	Mar. 31, 2025 $ / shares shares
Non-qualified stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	643,847
Weighted-Average Grant Date Fair Value (in dollars per share)	$ 73.55
Weighted-Average Exercise Price (in dollars per share)	$ 311.85
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	2,529,698
Weighted-Average Grant Date Fair Value (in dollars per share)	$ 312.07
Performance-based shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) | shares	476,480
Weighted-Average Grant Date Fair Value (in dollars per share)	$ 345.65