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Debt - 2014 Credit Agreement (Details) $ in Millions, $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2020 USD ($) | May 01, 2020 USD ($) | Jul. 01, 2018 | Mar. 13, 2018 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 13, 2018 CAD ($) | Mar. 13, 2018 AUD ($) | Mar. 31, 2017 | Sep. 29, 2016 USD ($) | Oct. 17, 2014 USD ($)
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  | 2.7 |  |  |  |  |  |  |
Proceeds from secured delayed draw term loan facility |  |  |  |  | $ 4,452,078,000 | $ 7,700,774,000 | $ 8,529,014,000 |  |  |  |  |
Term loan A |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 185,000,000.0 |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from secured delayed draw term loan facility | $ 248,500,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  | 0.75% |  |  |  |  |  |  |  |  |  |
2014 Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Maximum borrowing capacity |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio |  |  |  | 4.5 | 4.0 |  |  | 4.5 | 4.5 | 4.75 |  | 5.00
Consolidated interest coverage ratio |  |  |  |  | 5.0 |  |  |  |  |  |  |
2014 Credit Agreement | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 0.75% |  |  |  |  |  |  |  |
2014 Credit Agreement | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 1.75% |  |  |  |  |  |  |  |
2014 Credit Agreement | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 0.25% |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Minimum | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.25% |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 1.00% |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Maximum | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  | 2.00% |  |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan A |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 510,000,000 |  |  |  | $ 500 | $ 250 |  |  |
2014 Credit Agreement | Term loan A | Base Rate | USD |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 0.50% |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan A | Euro currency rate |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, basis spread (as a percent) |  |  |  | 1.50% |  |  |  |  |  |  |  |
2014 Credit Agreement | Term loan B |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |
2014 Credit Agreement | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |
Debt agreements |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,350,000,000 |  |  |  |  |  |  |  | $ 1,050,000,000.00
Current borrowing capacity |  |  |  |  |  | 1,331,000,000.0 | $ 1,327,200,000 |  |  |  |  |
Outstanding letters of credit |  |  |  |  | $ 19,000,000.0 | $ 22,800,000 |  |  |  |  |  |

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