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Restructuring and Other Charges - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 02, 2020 | Sep. 27, 2019 | Sep. 28, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (loss) on sale of business and investments | $ 110,236 | $ 935,110 | $ 0
Restructuring charges | 324,183 |  |
CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 324,183 | $ 311,332 | $ 190,806
Other | Other Expense | CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (loss) related to settlement | 2,100 |  |
Write off of Deferred Tax Asset | CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 10,000 |  |

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