Stock-Based Compensation - Share-based Payment Arrangement, Activity (Details) - $ / shares	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Restricted stock/units
Number Granted
Equity instruments other than options (in shares)	1,720,662	1,267,490
Weighted Average Grant Date Fair Value
Equity instruments other than options (in dollars per share)	$ 66.59	$ 78.50
Performance shares
Number Granted
Equity instruments other than options (in shares)	339,191	482,030
Weighted Average Grant Date Fair Value
Equity instruments other than options (in dollars per share)	$ 79.54	$ 82.88
Stock options
Number Granted
Equity instruments other than options (in shares)	570,140	548,398
Weighted Average Grant Date Fair Value
Equity instruments other than options (in dollars per share)	$ 18.21	$ 18.59