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Shareholders' Equity - Class of Treasury Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Equity, Class of Treasury Stock [Line Items]
Treasury Stock Acquired, Average Cost Per Share	$ 177.08	$ 142.62	$ 191.47
Stock Repurchased and Retired During Period, Value	$ 500,056	$ 350,049	$ 500,023
October 26, 2010 Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	2,824	2,454	2,611

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Total cost of shares repurchased divided by the total number of shares repurchased.

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