Stockholders' Equity (Summary of Activity for PSUs) (Details) - Performance Restricted Stock Units [Member] - $ / shares shares in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of units, Beginning balance	66
Granted, Number of units		66
Number of units, Ending balance	66	66
Weighted-Average Grant Date Fair Value, Beginning balance	$ 146.47
Granted, Weighted-Average Grant Date Fair Value		$ 146.47
Weighted-Average Grant Date Fair Value, Ending balance	$ 146.47	$ 146.47