Share-Based Compensation (Narrative) (Details)	9 Months Ended
	Jun. 30, 2023 $ / shares shares
Market-Based Deferred Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units/shares granted	85,612
Performance period	3 years
Weighted average grant date fair value (in dollars per unit/share) | $ / shares	$ 502.03
Time-Based Deferred Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units/shares granted	116,255
Weighted average grant date fair value (in dollars per unit/share) | $ / shares	$ 309.41
LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grant	1,200,000