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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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Amount of short-term and long-term debt and lease obligation.

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