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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 30, 2018 Business | Mar. 27, 2015 Business | Sep. 28, 2018 USD ($) segment | Sep. 29, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring pre-tax net charges |  |  |  | $ 22.6
Restructuring and integration related costs, before tax |  |  | $ 190.8 |
Net realizable value write-offs on contract accounts receivables |  |  |  | 16.5
Statutory redundancy and severance costs |  |  |  | 1.4
Other liabilities |  |  |  | $ 4.7
Number of lines of business | 3 | 4 | 3 |
CH2M HILL Companies, Ltd. |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring pre-tax net charges |  |  | $ 101.7 |
Integration related costs |  |  | $ 89.2 |

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