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Debt - URS Senior Notes (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Oct. 24, 2014 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Apr. 03, 2017 | Feb. 21, 2017 | Sep. 29, 2016 | Oct. 17, 2014
Debt |  |  |  |  |  |  |  |  |
Debt |  |  | $ 2,085,000 | $ 3,352,500 |  |  |  |  |
Repayments of debt |  |  | 248,522 |  | $ 800,000 |  |  |  |
Proceeds from secured delayed draw term loan facility |  |  | 4,452,078 | 7,700,774 | 8,529,014 |  |  |  |
Prepayment premium |  |  | $ 16,986 |  | $ 34,504 |  |  |  |
Term loan A |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 185,000 |
Amount of debt redeemed |  |  |  |  |  |  | $ 600,000 |  |
URS Senior Notes |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 1,000,000
Debt |  |  |  | $ 248,100 |  |  |  |  |
Redemption price (as percent of principal) |  | 101.00% |  |  |  |  |  |  |
Amount of debt redeemed |  | $ 572,300 |  |  |  |  |  |  |
Redemption price as a percentage of the principal amount |  | 101.00% |  |  |  |  |  |  |
Prepayment premium | $ 17,000 |  |  |  |  |  |  |  |
URS Senior Notes | 2017 URS Senior Notes |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.85%
Amount of debt redeemed |  |  |  |  |  | $ 179,200 |  |  |
URS Senior Notes | 2022 URS Senior Notes |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 5.00%
Redemption price (as percent of principal) | 106.835% |  |  |  |  |  |  |  |
Repayments of debt | $ 248,500 |  |  |  |  |  |  |  |
Proceeds from secured delayed draw term loan facility | $ 248,500 |  |  |  |  |  |  |  |
Redemption price as a percentage of the principal amount | 106.835% |  |  |  |  |  |  |  |

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