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Pension and Other Postretirement Benefit Plans - Schedule of Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands | Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
--- | --- | --- | ---
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | $ 390,829 | $ 147,788 | $ 142,464
U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 259,065 | 141,612 |
U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 131,736 |  |
U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 6,176 |
U.S. Plans | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 28 |  |
U.S. Plans | U.S. Domestic equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 77,798 | 103,760 |
U.S. Plans | U.S. Domestic equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 13,861 | 103,760 |
U.S. Plans | U.S. Domestic equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 63,937 |  |
U.S. Plans | U.S. Domestic equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
U.S. Plans | U.S. Domestic equities | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Overseas equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 26,699 |  |
U.S. Plans | Overseas equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 26,699 |  |
U.S. Plans | Overseas equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Overseas equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Overseas equities | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | U.S. Domestic bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 143,123 | 33,404 |
U.S. Plans | U.S. Domestic bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 84,894 | 33,404 |
U.S. Plans | U.S. Domestic bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 58,229 |  |
U.S. Plans | U.S. Domestic bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
U.S. Plans | U.S. Domestic bonds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Overseas bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 10,508 |  |
U.S. Plans | Overseas bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 938 |  |
U.S. Plans | Overseas bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 9,570 |  |
U.S. Plans | Overseas bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Overseas bonds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Cash and equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 6,631 | 4,448 |
U.S. Plans | Cash and equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 6,631 | 4,448 |
U.S. Plans | Cash and equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Cash and equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
U.S. Plans | Cash and equivalents | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Real estate | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year |  | 0 | 3,477
U.S. Plans | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 28 | 6,176 |
U.S. Plans | Hedge funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
U.S. Plans | Hedge funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Hedge funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 6,176 | 5,715
U.S. Plans | Hedge funds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 28 |  |
U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 126,042 |  |
U.S. Plans | Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 126,042 |  |
U.S. Plans | Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
U.S. Plans | Mutual funds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 1,867,481 | 1,076,928 | 1,003,911
Non-U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 33,803 | 639,872 |
Non-U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 1,333,707 |  |
Non-U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 331,155 | 437,056 |
Non-U.S. Plans | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 168,816 |  |
Non-U.S. Plans | U.S. Domestic equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 68,510 | 30,916 |
Non-U.S. Plans | U.S. Domestic equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 30,916 |
Non-U.S. Plans | U.S. Domestic equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 31,868 |  |
Non-U.S. Plans | U.S. Domestic equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
Non-U.S. Plans | U.S. Domestic equities | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 36,642 |  |
Non-U.S. Plans | Overseas equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 371,984 | 229,205 |
Non-U.S. Plans | Overseas equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 229,205 |
Non-U.S. Plans | Overseas equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 327,309 |  |
Non-U.S. Plans | Overseas equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
Non-U.S. Plans | Overseas equities | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 44,675 |  |
Non-U.S. Plans | U.S. Domestic bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 223,614 | 263,145 |
Non-U.S. Plans | U.S. Domestic bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 252 | 263,145 |
Non-U.S. Plans | U.S. Domestic bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 222,282 |  |
Non-U.S. Plans | U.S. Domestic bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
Non-U.S. Plans | U.S. Domestic bonds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 1,080 |  |
Non-U.S. Plans | Overseas bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 702,770 | 77,682 |
Non-U.S. Plans | Overseas bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 77,682 |
Non-U.S. Plans | Overseas bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 641,966 |  |
Non-U.S. Plans | Overseas bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
Non-U.S. Plans | Overseas bonds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 60,804 |  |
Non-U.S. Plans | Cash and equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 41,304 | 38,924 |
Non-U.S. Plans | Cash and equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 33,482 | 38,924 |
Non-U.S. Plans | Cash and equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 7,822 |  |
Non-U.S. Plans | Cash and equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
Non-U.S. Plans | Cash and equivalents | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 144,142 | 58,974 |
Non-U.S. Plans | Real estate | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
Non-U.S. Plans | Real estate | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 26,987 |  |
Non-U.S. Plans | Real estate | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 99,587 | 58,974 | 55,665
Non-U.S. Plans | Real estate | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 17,568 |  |
Non-U.S. Plans | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 99,970 | 74,353 |
Non-U.S. Plans | Insurance contracts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 | 0 |
Non-U.S. Plans | Insurance contracts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 4,188 |  |
Non-U.S. Plans | Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 95,782 | 74,353 | 39,473
Non-U.S. Plans | Insurance contracts | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | (26,656) |  |
Non-U.S. Plans | Derivatives | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans | Derivatives | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | (26,656) |  |
Non-U.S. Plans | Derivatives | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans | Derivatives | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 143,833 |  |
Non-U.S. Plans | Hedge funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans | Hedge funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 0 |  |
Non-U.S. Plans | Hedge funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 135,786 | 303,729 | $ 272,517
Non-U.S. Plans | Hedge funds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 8,047 |  |
Non-U.S. Plans | Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 98,010 |  |
Non-U.S. Plans | Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 69 |  |
Non-U.S. Plans | Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | 97,941 |  |
Non-U.S. Plans | Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year |  |  |
Non-U.S. Plans | Mutual funds | Investments measured at Net Asset Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year | $ 0 |  |
Non-U.S. Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year |  | 303,729 |
Non-U.S. Plans | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year |  | 0 |
Non-U.S. Plans | Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at the end of the year |  | $ 303,729 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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