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Shareholders' Equity - Class of Treasury Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 259.46 | $ 184.07 | $ 257.37 | $ 170.59
Stock Repurchased and Retired During Period, Value | $ 125,009 | $ 100,011 | $ 250,019 | $ 250,029
October Twenty Six Two Thousand Ten Program |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Stock Repurchased and Retired During Period, Shares | 481 | 543 | 971 | 1,465

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