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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
9 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options outstanding, Number of options 5,396 5,352 5,339
Options vested and exercisable, Number of options 3,569    
Options vested and expected to vest, Number of options 5,333    
Options outstanding, Weighted-Average Exercise Price $ 74.15 $ 73.71 $ 68.21
Options vested and exercisable, Weighted-Average Exercise Price Per Share 65.45    
Options vested and expected to vest, Weighted-Average Exercise Price Per Share $ 73.87    
Options outstanding, Weighted-Average Remaining Life in Years 5 years 9 months 18 days    
Options vested and exercisable, Weighted-Average Remaining Life in Years 4 years 8 months 12 days    
Options vested and expected to vest, Weighted-Average Remaining Life in Years 5 years 9 months 18 days    
Options outstanding, Aggregate Intrinsic Value $ 118,422    
Options vested and exercisable, Aggregate Intrinsic Value 100,271    
Options vested and expected to vest, Aggregate Intrinsic Value $ 117,969