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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jul. 01, 2022 | Jun. 30, 2023 | Jul. 01, 2022
Income Tax Contingency [Line Items] |  |  |  |
Effective income tax rate | 23.90% | 21.90% | 18.20% | 20.40%
U.S state income tax expense | $ 5.3 | $ 8.4 | $ 15.8 | $ 17.4
U.S tax on foreign earnings | 5.4 | 5.3 | 13.6 | 9.3
Foreign tax credit | $ 3.5 |  | 12.1 | 15.4
Settled tax benefit related to uncertain tax positions |  | $ 9.1 | 39.4 | 9.1
Tax benefit |  |  |  | $ 4.9
CH2M HILL Companies, Ltd. |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Settled tax benefit related to uncertain tax positions |  |  | $ 30.8 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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