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Debt - Credit Agreement (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 23, 2023 | Feb. 08, 2021 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 25, 2021 USD ($) | Apr. 13, 2021 USD ($)
Debt agreements |  |  |  |  |  |  |
Proceeds from borrowings under credit agreements |  |  | $ 3,506,668,000 | $ 3,618,585,000 | $ 3,638,916,000 |  |
2014 Credit Agreement | Base Rate |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) | 0.75% |  |  |  |  |  |
2014 Credit Agreement | SOFR |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) | 1.75% |  |  |  |  |  |
2014 Credit Agreement | Term loan A |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 215,000,000 |
Credit Agreement |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Consolidated leverage ratio |  |  | 2.00 |  |  |  |
Credit Agreement | Base Rate |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 0.225% |  |  |  |  |
Credit Agreement | LIBOR |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.225% |  |  |  |  |
Credit Agreement | Minimum |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Consolidated interest coverage ratio |  | 3.00 |  |  |  |  |
Credit Agreement | Maximum |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Consolidated leverage ratio |  | 4.00 |  |  |  |  |
Credit Agreement | Term loan A |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 246,968,737.50 |  |  |  |  |
Credit Agreement | Term B facility |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 700,000,000
Credit Agreement | Revolving credit facility |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,150,000,000 |  |  |  |  |
Current borrowing capacity |  |  | $ 1,145,600,000 | 1,145,600,000 |  |  |
Outstanding letters of credit |  |  | $ 4,400,000 | $ 4,400,000 |  |  |
2024 Senior Notes |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |
Cash tender offer to purchase |  |  |  |  |  |  | $ 700,000,000
Interest rate (as a percent) |  |  |  |  |  | 5.875% | 5.875%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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