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Stockholders' Equity (Summary of Activity for RSUs) (Details) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
 12 Months Ended
Sep. 30, 2025
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of units, Beginning balance | shares 318
Granted, Number of units | shares 124
Vested, Number of units | shares (123)
Forfeited, Number of units | shares (10)
Number of units, Ending balance | shares 309
Weighted-Average Grant Date Fair Value, Beginning balance | $ / shares $ 118.19
Granted, Weighted-Average Grant Date Fair Value | $ / shares 194.4
Vested, Weighted-Average Grant Date Fair Value | $ / shares 116.93
Forfeited, Weighted-Average Grant Date Fair Value | $ / shares 149.06
Weighted-Average Grant Date Fair Value, Ending balance | $ / shares $ 148.31