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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure |  |  |
Employer match percent | 25.00% |  |
Percentage match of eligible compensation contributed to investment selection | 2.00% |  |
Profit share expense | $ 33,250 | $ 22,524 | $ 26,534
Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Total accumulated benefit obligation | 1,235,230 | $ 1,044,579 |
Fair values of plan assets | 1,170,405 |  |
Reduction in service and interest costs for annual pension expense in the next fiscal year |  |  | $ 7,000
Estimated net prior service cost that will be amortized in next fiscal year | 131 |  |
Estimated net actuarial loss that will be amortized in next fiscal year | 38,658 |  |
Trust for Unqualified Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Estimated future employer contributions in next fiscal year | 4,500 |  |
Postretirement Benefit Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets | $ 0 |  |
Discount rate | 3.00% | 4.20% | 3.60%
Service cost discount rate | 4.30% | 3.70% | 3.40%
Interest cost discount rate | 3.80% | 2.80% | 2.50%
Assumed annual per capita rate of increase of medical and drug costs for next fiscal year | 8.00% |  |
Defined benefit plan, ultimate trend rate | 4.50% |  |
Increase in accumulated postretirement benefit obligation due to one percentage point increase in heath care cost trend rate | $ 149 |  |
Decrease in accumulated postretirement benefit obligation due to one percentage point decrease in health care cost trend rate | $ 136 |  |
Class B Common Stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Number of shares owned by the participants under RSP (in shares) | 1,431,539 |  |
U.S. Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair values of plan assets | $ 1,004,163 | $ 878,983 | $ 756,274
Assumptions for pension expense, average rate of return on plan assets | 5.30% | 7.00% | 7.50%
Plan assets | $ 35,429 | $ 49,967 |
Discount rate | 3.30% | 4.30% | 4.00%
Service cost discount rate | 4.40% | 4.20% | 4.00%
Interest cost discount rate | 4.10% | 3.50% | 3.20%
U.S. Plans | Equity | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Actual Plan Asset Allocations | 18.00% | 21.00% |
U.S. Plans | Fixed income securities | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Actual Plan Asset Allocations |  | 79.00% |
Non-U.S. Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair values of plan assets | $ 166,242 | $ 145,641 | $ 141,906
Assumptions for pension expense, average rate of return on plan assets | 3.50% | 3.50% | 3.60%
Estimated future employer contributions in next fiscal year | $ 7,600 |  |
Plan assets | $ 2,575 | $ 7,874 |
Discount rate | 1.60% | 2.80% | 2.50%
Service cost discount rate | 2.90% | 2.50% | 2.00%
Interest cost discount rate | 2.60% | 2.20% | 1.70%
Non-U.S. Plans | Equity | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Actual Plan Asset Allocations | 25.00% | 33.00% |
Assumptions for pension expense, assumed average asset allocation | 30.00% |  |
Non-U.S. Plans | Fixed income securities | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Assumptions for pension expense, assumed average asset allocation | 70.00% |  |

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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + 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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