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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended
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Dec. 28, 2018 USD ($) | Dec. 29, 2017 USD ($) | Mar. 27, 2015 Business
Restructuring Cost and Reserve [Line Items] |  |  |
Number of lines of business | Business |  |  | 4
ECR Business |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Liabilities held for sale | $ 33.2 |  |
CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring pre-tax net charges | 8.2 | $ 5.5 |
Integration related costs | $ 26.0 | $ 13.8 |

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