Stockholders' Equity (Summary of Activity for PSUs) (Details) - Performance Restricted Stock Units [Member] - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of units, Beginning balance	105	62
Granted, Number of units		44
Forfeited, Number of units	(1)	(2)
Number of units, Ending balance	104	104
Weighted-Average Grant Date Fair Value, Beginning balance	$ 167.25	$ 146.47
Granted, Weighted-Average Grant Date Fair Value		196.63
Forfeited Weighted-Average Grant Date Fair Value	174.04	172.64
Weighted-Average Grant Date Fair Value, Ending balance	$ 167.2	$ 167.2