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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 22, 2018 | Jun. 26, 2020 | Jun. 28, 2019 | Jun. 26, 2020 | Jun. 28, 2019
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate |  | 22.30% | (2.10%) | 19.70% | 4.30%
Income tax expense (benefit) |  |  | $ (21.7) | $ 62.6 |
Lapse of applicable statute of limitations |  | $ 4.1 |  |  |
Release of valuation allowance |  |  |  | 21.7 |
Change in enacted tax rate |  |  |  | 37.4 |
Benefit from IRC section 179D |  | 6.9 |  |  |
Favorable settlement with the Indian Revenue Service |  |  |  | 3.7 |
Foreign tax credits and research and development |  |  |  | $ 5.8 |
Measurement period |  |  |  | 1 year |
Income tax expense for the measurement period | $ 144.4 |  |  |  |
Cumulative transition taxes during the measurement period |  |  |  | $ 14.3 |
Foreign Tax Authority | United Kingdom |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Release of valuation allowance |  | $ 12.6 |  | 12.6 |
Foreign Tax Authority | Ministry of Finance, India |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Change in enacted tax rate |  |  |  | $ 4.1 |
CH2M HILL Companies, Ltd. |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense for the measurement period | $ 104.2 |  |  |  |

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