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Restructuring and Other Charges - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 26, 2019 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
ECR Business |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, pre-tax, gross |  | $ 72.6 |  | $ 106.1 |
CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges, pre-tax, gross |  | 6.0 | $ 33.9 | 68.5 | $ 94.6
Integration related activities | $ 3,400.0 | 17.3 | 12.6 | 30.8 | 40.6
Restructuring pre-tax net charges |  | $ 23.3 | $ 46.5 | $ 99.3 | $ 135.2

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