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Debt - 2014 Credit Agreement (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 25, 2021 USD ($) | Feb. 08, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Apr. 13, 2021 USD ($)
Debt agreements |  |  |  |  |  |
Proceeds from secured delayed draw term loan facility |  |  | $ 3,638,916,000 | $ 4,452,078,000 | $ 7,700,774,000 |
Credit Agreement |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Consolidated leverage ratio |  | 4.00 | 2.4 |  |  |
Consolidated interest coverage ratio |  | 3.00 |  |  |  |
Credit Agreement | Term loan A |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Maximum borrowing capacity |  | $ 246,968,737.50 |  |  |  |
Proceeds from secured delayed draw term loan facility | $ 215,000,000 |  |  |  |  |
Credit Agreement | Term loan A | LIBOR |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 1.50% |  |  |  |
Credit Agreement | Term loan B | Base Rate |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 0.50% |  |  |  |
Credit Agreement | Term B facility |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 700,000,000
Consolidated leverage ratio |  |  |  |  |  | 1.75
Consolidated interest coverage ratio |  |  |  |  |  | 0.75
Credit Agreement | Revolving credit facility |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,150,000,000 |  |  |  |
Current borrowing capacity |  |  | $ 1,144,800,000 | 1,331,000,000.0 |  |
Outstanding letters of credit |  |  | $ 5,200,000 | $ 19,000,000.0 |  |
2024 Senior Notes |  |  |  |  |  |
Debt agreements |  |  |  |  |  |
Cash tender |  |  |  |  |  | $ 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://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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