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Pension and Other Postretirement Benefit Plans - Schedule of Amount Recognized in Accompanying Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 27, 2019 | Sep. 28, 2018
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U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prepaid benefit cost included in noncurrent assets | $ 0 | $ 0
Accrued benefit cost included in current liabilities | 85 | 2,548
Accrued benefit cost included in noncurrent liabilities | 58,245 | 55,025
Net amount recognized at the end of the year | 58,330 | 57,573
Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Prepaid benefit cost included in noncurrent assets | 2,939 | 19,736
Accrued benefit cost included in current liabilities | 4,177 | 3,671
Accrued benefit cost included in noncurrent liabilities | 340,254 | 297,830
Net amount recognized at the end of the year | $ 341,492 | $ 281,765

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