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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Feb. 03, 2021	Oct. 31, 2018	Oct. 26, 2010
Equity, Class of Treasury Stock [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 400,000		$ 400,000	$ 500,000
Accelerated Share Repurchases, Cash or Stock Settlement		2.1 million
Adjustments To Additional Paid In Capital, Equity Forward Contract		$ 100,000		$ 100,000
Treasury Stock Acquired, Average Cost Per Share	$ 204.96	$ 194.91	$ 217.71	$ 194.91
October Twenty Six Two Thousand Ten Program
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 1,000,000	$ 4,400,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 522,000		$ 522,000

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Adjustments To Additional Paid In Capital, Equity Forward Contract

+ References

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Description of the nature of the settlement (cash or stock) of the accelerated share repurchases agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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

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