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Restructuring and Other Charges - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Mar. 27, 2015 Business | Jun. 29, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring pre-tax net charges |  |  | $ 22.6 |  |
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 | Business |  |  |  | 4 |
CH2M HILL Companies, Ltd. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring pre-tax net charges | $ 33.9 |  |  |  | $ 94.6
Integration related costs | $ 12.6 |  |  |  | $ 40.6

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