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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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- Definition Description of the nature of the settlement (cash or stock) of the accelerated share repurchases agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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