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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 22, 2018 | Mar. 27, 2020 | Mar. 29, 2019 | Mar. 27, 2020 | Mar. 29, 2019
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate |  | 34.60% | (7.10%) | 9.50% | 7.30%
Tax benefit due to divestiture |  | $ 37.4 |  |  |
Foreign tax credits and research and development |  | 5.8 |  |  |
Benefit from IRC section 179D |  | $ 4.1 |  |  |
Favorable settlement with the Indian Revenue Service |  |  |  | $ 3.7 |
Measurement period |  |  |  | 1 year |
Income tax expense for the measurement period | $ 144.4 |  |  |  |
Cumulative transition taxes during the measurement period |  |  |  | $ 14.3 |
CH2M HILL Companies, Ltd. |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense for the measurement period | $ 104.2 |  |  |  |

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