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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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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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