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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. 27, 2019 | Sep. 28, 2018
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 | $ 390,829 | $ 147,788
Effect of exchange rate changes | 2,271 | 0
Fair value of plan assets at the end of the year | 390,210 | 390,829
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 | 0 | 6,176
Purchases, sales, and settlements |  | (6,176)
Realized and unrealized gains |  | 0
Fair value of plan assets at the end of the year | 0 | 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 | 28 |
Fair value of plan assets at the end of the year | 0 | 28
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 | 0 |
Fair value of plan assets at the end of the year | 0 | 0
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 | 1,867,481 | 1,076,928
Effect of exchange rate changes | 109,681 | 9,778
Fair value of plan assets at the end of the year | 1,916,637 | 1,867,481
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 | 331,155 |
Fair value of plan assets at the end of the year | 300,527 | 331,155
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 | 144,142 |
Fair value of plan assets at the end of the year | 137,472 | 144,142
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 | 99,587 | 58,974
Purchases, sales, and settlements | (17,902) | 42,711
Realized and unrealized gains | 21,838 | (784)
Disposition of ECR Assets | 0 |
Effect of exchange rate changes | (5,984) | (1,314)
Fair value of plan assets at the end of the year | 97,539 | 99,587
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 | 99,970 |
Fair value of plan assets at the end of the year | 77,266 | 99,970
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 | 95,782 | 74,353
Purchases, sales, and settlements | (5,126) | 21,626
Realized and unrealized gains | 9,134 | 1,551
Disposition of ECR Assets | (22,885) |
Effect of exchange rate changes | (4,117) | (1,748)
Fair value of plan assets at the end of the year | 72,788 | 95,782
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 beginning of the year | 143,833 |
Fair value of plan assets at the end of the year | 137,356 | 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 | 135,786 | 303,729
Purchases, sales, and settlements | (26,591) | (154,446)
Realized and unrealized gains | 29,161 | (6,650)
Disposition of ECR Assets | 0 |
Effect of exchange rate changes | (8,156) | (6,847)
Fair value of plan assets at the end of the year | $ 130,200 | $ 135,786

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + 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 Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(B) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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