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Credit Agreements - Schedule of Debt Instruments (Parenthetical) (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Feb. 26, 2020 | May 31, 2018 | Mar. 31, 2015
4.600% Senior Notes Due May 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate, stated percentage | 4.60% | 4.60% |  | 4.60% |
Maturity month and year | 2028-05 | 2028-05 |  |  |
3.100% Senior Notes due March 2030 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate, stated percentage | 3.10% |  | 3.10% |  |
Maturity month and year | 2030-03 |  |  |  |
5.375% Senior Notes due March 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument interest rate, stated percentage |  | 5.375% |  |  | 5.375%
Maturity month and year |  | 2025-03 |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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