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Debt - 2017 Senior Notes (Details) - USD ($)	Feb. 21, 2017	Oct. 24, 2014	Sep. 30, 2020	Sep. 29, 2016	Oct. 17, 2014
Term loan B
Debt
Amount of debt redeemed	$ 127,600,000
Term loan A
Debt
Face amount				$ 185,000,000.0
Amount of debt redeemed	600,000,000
Revolving credit facility
Debt
Amount of debt redeemed	250,000,000
2017 Senior Notes
Debt
Face amount	$ 1,000,000,000
Fair value of debt instrument			$ 1,069,600,000
Interest rate (as a percent)	5.125%
2017 Senior Notes | At any time and from time to time prior to December 15, 2026
Debt
Redemption price (in percent)	100.00%
2017 Senior Notes | At any time on or after December 15, 2026
Debt
Redemption price (in percent)	100.00%
URS Senior Notes
Debt
Face amount					$ 1,000,000,000.0
Amount of debt redeemed		$ 572,300,000
Redemption price (as percent of principal)		101.00%

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