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Restructuring and Other Charges - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 21, 2018 USD ($) | Mar. 29, 2019 USD ($) | Mar. 30, 2018 USD ($) | Mar. 27, 2015 Business | Mar. 29, 2019 USD ($) | Mar. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of lines of business | Business |  |  |  | 4 |  |
ECR Business |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, pre-tax, gross |  | $ 0.8 |  |  | $ (5.8) |
Integration related activities |  | 31.6 |  |  | 37.0 |
Restructuring pre-tax net charges |  | 32.4 |  |  | 31.2 |
Liabilities held for sale |  | 21.1 |  |  | 21.1 |
CH2M HILL Companies, Ltd. |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges, pre-tax, gross |  | 49.6 | $ 55.2 |  | 64.3 | $ 60.7
Integration related activities | $ 3,300.0 | (12.3) | 14.1 |  | 13.5 | 28.0
Restructuring pre-tax net charges |  | $ 37.3 | $ 69.3 |  | $ 77.8 | $ 88.7

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