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Pension and Other Postretirement Benefit Plans - Schedule of Change in Plans' Combined Net Benefit Obligation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net benefit obligation at the beginning of the year | $ 448,402 | $ 169,942 |
Service cost | 2,784 | 4,765 | $ 1,000
Interest cost | 16,697 | 13,778 | 5,757
Participants’ contributions | 243 | 839 |
Actuarial (gains)/losses | 52,720 | (30,730) |
Benefits paid | (30,648) | (27,914) |
Curtailments/settlements/plan amendments | (39,388) | (9,434) |
Acquisition of CH2M Plans | 0 | 327,156 |
Disposition of ECR Plans | 0 | 0 |
Effect of exchange rate changes and other, net | (2,270) | 0 |
Net benefit obligation at the end of the year | 448,540 | 448,402 | 169,942
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net benefit obligation at the beginning of the year | 2,149,246 | 1,306,807 |
Service cost | 7,171 | 8,269 | 7,509
Interest cost | 52,627 | 49,324 | 31,205
Participants’ contributions | 367 | 451 |
Actuarial (gains)/losses | 314,889 | (43,595) |
Benefits paid | (72,453) | (75,711) |
Curtailments/settlements/plan amendments | 30,124 | (6,136) |
Acquisition of CH2M Plans | 0 | 924,233 |
Disposition of ECR Plans | (99,504) | 0 |
Effect of exchange rate changes and other, net | (124,338) | (14,396) |
Net benefit obligation at the end of the year | $ 2,258,129 | $ 2,149,246 | $ 1,306,807

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- Definition Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment, Settlements and Plan Amendments + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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 (a)(3) -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 benefit obligation 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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