Stockholders' Equity (Summary of Activity for RSUs) (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	3 Months Ended
	Dec. 31, 2023 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of units, Beginning balance | shares	177
Granted, Number of units | shares	12
Forfeited/Released, Number of units | shares	(19)
Number of units, Ending balance | shares	170
Weighted-Average Grant Date Fair Value, Beginning balance | $ / shares	$ 93.46
Granted, Weighted-Average Grant Date Fair Value | $ / shares	131.66
Forfeited/Released, Weighted-Average Grant Date Fair Value | $ / shares	85.91
Weighted-Average Grant Date Fair Value, Ending balance | $ / shares	$ 96.95