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Employee Benefit Plans (Narrative) (Details) $ in Thousands | 12 Months Ended
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Oct. 01, 2016 USD ($) shares | Oct. 03, 2015 USD ($) | Sep. 27, 2014 USD ($)
Employee Benefit Plans |  |  |
Employer match percent | 25.00% |  |
Percentage match of eligible compensation contributed to investment selection | 2.00% |  |
Total accumulated benefit obligation | $ 1,105,973 | $ 941,266 |
Fair values of plan assets total | $ 810,457 |  |
Number of plans | 3 |  |
Fair value of plan assets exceeding accumulated benefit obligations | $ 744,751 | 634,406 |
Accumulated benefit obligations in excess of plan assets | 1,045,034 | 886,663 |
Reduction in service and interest costs for annual pension expense in the next fiscal year | $ 7,000 |  |
Service cost discount rate | 3.96% |  |
Interest cost discount rate | 3.21% |  |
Defined benefit plan, ultimate trend rate | 4.50% |  |
Defined benefit plan, year of ultimate trend rate | 2028 |  |
Increase in accumulated postretirement benefit obligation due to one percentage point increase in heath care cost trend rate | $ 358 |  |
Decrease in accumulated postretirement benefit obligation due to one percentage point decrease in health care cost trend rate | 311 |  |
Profit share expense | 16,656 | 13,188 | $ 22,030
U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Fair values of plan assets total | $ 675,018 | $ 578,783 |
Assumptions for pension expense, average rate of return on plan assets | 7.70% | 8.00% | 8.40%
Estimated future employer contributions in next fiscal year | $ 63,200 |  |
Assumptions for benefit obligations, Discount rate | 3.80% | 4.50% | 4.40%
Assumptions for net periodic benefit cost, Discount rate | 4.50% | 4.40% | 5.00%
Non-U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Fair values of plan assets total | $ 135,439 | $ 117,693 |
Assumptions for pension expense, average rate of return on plan assets | 4.10% | 4.50% | 4.10%
Estimated future employer contributions in next fiscal year | $ 7,000 |  |
Assumptions for benefit obligations, Discount rate | 1.90% | 3.00% | 3.10%
Assumptions for net periodic benefit cost, Discount rate | 3.00% | 3.10% | 3.70%
Postretirement Benefit Plan |  |  |
Employee Benefit Plans |  |  |
Defined Benefit Plan, Assets for Plan Benefits | $ 0 |  |
Assumptions for benefit obligations, Discount rate | 3.20% | 3.90% | 3.90%
Assumptions for net periodic benefit cost, Discount rate | 3.90% | 4.50% | 4.50%
Defined Benefit Pension |  |  |
Employee Benefit Plans |  |  |
Estimated net prior service cost that will be amortized in next fiscal year | $ 71 |  |
Estimated net actuarial loss that will be amortized in next fiscal year | 38,264 |  |
Three Plan Member |  |  |
Employee Benefit Plans |  |  |
Fair value of plan assets exceeding accumulated benefit obligations | 65,706 | $ 62,070 |
Accumulated benefit obligations in excess of plan assets | $ 60,939 | 54,603 |
Medical And Drug Costs Before Age Sixty Five |  |  |
Employee Benefit Plans |  |  |
Assumed annual per capita rate of increase of medical and drug costs for next fiscal year | 6.80% |  |
Medical Costs After Age Sixty Five |  |  |
Employee Benefit Plans |  |  |
Assumed annual per capita rate of increase of medical and drug costs for next fiscal year | 6.60% |  |
Drug Costs After Age Sixty Five |  |  |
Employee Benefit Plans |  |  |
Assumed annual per capita rate of increase of medical and drug costs for next fiscal year | 6.90% |  |
Class A Common Stock | U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Number of stock included in plan assets | shares | 149,022 |  |
Class B Common Stock |  |  |
Employee Benefit Plans |  |  |
Number of shares owned by the participants under RSP | shares | 1,839,185 |  |
Class B Common Stock | U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Number of stock included in plan assets | shares | 1,001,034 |  |
Equity Securities | U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 50.00% |  |
Equity Securities | Non-U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 30.00% |  |
Fixed Income Securities | U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 40.00% |  |
Fixed Income Securities | Non-U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 70.00% |  |
Real estate and Other securities | U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 10.00% |  |
Limited Partnerships | U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Fair values of plan assets total | $ 44,003 | 64,760 |
Interest In Common Collective Trusts | U.S. Pension Plans |  |  |
Employee Benefit Plans |  |  |
Fair values of plan assets total | $ 237,032 | $ 88,870 |
Minimum |  |  |
Employee Benefit Plans |  |  |
Spot rates used for service and interest cost | 1.26% | 3.88% |
Maximum |  |  |
Employee Benefit Plans |  |  |
Spot rates used for service and interest cost | 4.30% | 4.72% |

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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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