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Restructuring and Other Charges - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (loss) on sale of business and investments | $ 935,110 | $ 0 | $ 0
Other | CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain (loss) on sale of business and investments |  | $ 21,000 |
Other | Other Expense | CH2M HILL Companies, Ltd. |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Litigation settlement, expense | $ 35,000 |  |

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- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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