Stockholders' Equity (Summary of Activity for Restricted Stock) (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	12 Months Ended
	Sep. 30, 2023 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units, Beginning balance | shares	59
Granted, Number of units | shares	122
Vested, Number of units | shares	(2)
Forfeited, Number of units | shares	(2)
Number of units, Ending balance | shares	177
Weighted-Average Grant Date Fair Value, Beginning balance | $ / shares	$ 98.29
Granted, Weighted-Average Grant Date Fair Value | $ / shares	90.89
Vested, Weighted-Average Grant Date Fair Value | $ / shares	91.89
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares	83.24
Weighted-Average Grant Date Fair Value, Ending balance | $ / shares	$ 93.46