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Stockholders' Equity (Stock Options Vested, or Expected to Vest and Exercisable) (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options outstanding, Number of options 5,574 5,836 5,339
Options vested and exercisable, Number of options 3,899    
Options vested and expected to vest, Number of options 5,503    
Options outstanding, Weighted-Average Exercise Price $ 76.35 $ 75.27 $ 74.40
Options vested and exercisable, Weighted-Average Exercise Price Per Share 71.14    
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 76.16    
Options outstanding, Weighted-Average Remaining Life in Years 5 years 7 months 6 days    
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 6 months    
Options vested and expected to vest, Weighted-Average Remaining Life in Years 5 years 7 months 6 days    
Options outstanding, Aggregate Intrinsic Value $ 130,942    
Options vested and exercisable, Aggregate Intrinsic Value 107,908    
Options vested and expected to vest, Aggregate Intrinsic Value $ 130,216