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Pension and Other Postretirement Benefit Plans - Summary of Changes in the Fair Value of Plans' Level 3 Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2018 | Sep. 29, 2017
U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | $ 147,788 | $ 142,464
Effect of exchange rate changes | 0 | 0
Fair value of plan assets at the end of the year | 390,829 | 147,788
U.S. Plans | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 6,176 |
Fair value of plan assets at the end of the year | 0 | 6,176
U.S. Plans | Real estate investments | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 0 | 3,477
Purchases, sales, and settlements |  | (3,477)
Realized and unrealized gains |  | 0
Fair value of plan assets at the end of the year |  | 0
U.S. Plans | Hedge funds |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 6,176 |
Fair value of plan assets at the end of the year | 28 | 6,176
U.S. Plans | Hedge funds | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 6,176 | 5,715
Purchases, sales, and settlements | (6,176) | (557)
Realized and unrealized gains | 0 | 1,018
Fair value of plan assets at the end of the year | 0 | 6,176
Non-U.S. Plans |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 1,076,928 | 1,003,911
Effect of exchange rate changes | (9,778) | 75,409
Fair value of plan assets at the end of the year | 1,867,481 | 1,076,928
Non-U.S. Plans | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 437,056 |
Fair value of plan assets at the end of the year | 331,155 | 437,056
Non-U.S. Plans | Real estate investments |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 58,974 |
Fair value of plan assets at the end of the year | 144,142 | 58,974
Non-U.S. Plans | Real estate investments | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 58,974 | 55,665
Purchases, sales, and settlements | 42,711 | (1,199)
Realized and unrealized gains | (784) | 2,642
Transfers | 0 | 0
Effect of exchange rate changes | (1,314) | 1,866
Fair value of plan assets at the end of the year | 99,587 | 58,974
Non-U.S. Plans | Insurance contracts |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 74,353 |
Fair value of plan assets at the end of the year | 99,970 | 74,353
Non-U.S. Plans | Insurance contracts | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 74,353 | 39,473
Purchases, sales, and settlements | 21,626 | 422
Realized and unrealized gains | 1,551 | (7,572)
Transfers | 0 | 40,031
Effect of exchange rate changes | (1,748) | 1,999
Fair value of plan assets at the end of the year | 95,782 | 74,353
Non-U.S. Plans | Hedge funds |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the end of the year | 143,833 |
Non-U.S. Plans | Hedge funds | Level 3 |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |
Fair value of plan assets at the beginning of the year | 303,729 | 272,517
Purchases, sales, and settlements | (154,446) | (9,022)
Realized and unrealized gains | (6,650) | 19,662
Transfers | 0 | 11,758
Effect of exchange rate changes | (6,847) | 8,814
Fair value of plan assets at the end of the year | $ 135,786 | $ 303,729

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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 (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from assets transferred into (from) plan. + References No definition available. + Details
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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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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements. + 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 (d)(5)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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