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Debt - URS Senior Notes (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Oct. 17, 2014
Debt |  |  |  |  |
Repayments of debt |  | $ 797,252 | $ 248,522 |  |
Proceeds from secured delayed draw term loan facility |  | 3,638,916 | 4,452,078 | $ 7,700,774 |
Prepayment premium on redemption of unsecured senior notes |  | $ 117,500 | $ 16,986 |  |
URS Senior Notes |  |  |  |  |
Debt |  |  |  |  |
Prepayment premium on redemption of unsecured senior notes | $ 17,000 |  |  |  |
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 |  |  |  |

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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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- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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