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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Defined Benefit Plan Disclosure |  |  |
Employer match percent | 25.00% |  |
Percentage match of eligible compensation contributed to investment selection | 2.00% |  |
Profit share expense | $ 26,534 | $ 16,656 | $ 13,188
Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Total accumulated benefit obligation | 1,064,195 | $ 1,105,973 |
Fair values of plan assets total | 898,180 |  |
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 | 130 |  |
Estimated net actuarial loss that will be amortized in next fiscal year | 30,107 |  |
Postretirement Benefit Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Plan assets | $ 0 |  |
Discount rate | 3.60% | 3.20% | 3.90%
Service cost discount rate | 3.40% |  |
Interest cost discount rate | 2.50% |  |
Discount rate |  | 3.90% | 4.50%
Assumed annual per capita rate of increase of medical and drug costs for next fiscal year | 6.60% |  |
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 | $ 195 |  |
Decrease in accumulated postretirement benefit obligation due to one percentage point decrease in health care cost trend rate | $ 185 |  |
Class B Common Stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Number of shares owned by the participants under RSP (in shares) | 1,575,347 |  |
U.S. Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair values of plan assets total | $ 756,274 | $ 675,018 | $ 578,783
Assumptions for pension expense, average rate of return on plan assets | 7.50% | 7.70% | 8.00%
Estimated future employer contributions in next fiscal year | $ 64,400 |  |
Plan assets | $ 0 | $ 0 |
Discount rate | 4.00% | 3.80% | 4.50%
Service cost discount rate | 4.00% |  |
Interest cost discount rate | 3.20% |  |
Discount rate |  | 4.50% | 4.40%
U.S. Plans | Class B Common Stock | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Number of shares included in plan assets (in shares) | 1,001,034 |  |
U.S. Plans | Equity | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Assumptions for pension expense, assumed rate of return | 55.00% |  |
U.S. Plans | Fixed income securities | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Assumptions for pension expense, assumed rate of return | 45.00% |  |
Non-U.S. Plans | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair values of plan assets total | $ 141,906 | $ 135,439 | $ 117,693
Assumptions for pension expense, average rate of return on plan assets | 3.60% | 4.10% | 4.50%
Estimated future employer contributions in next fiscal year | $ 7,300 |  |
Plan assets | $ 1,672 | $ 108 |
Discount rate | 2.50% | 1.90% | 3.00%
Service cost discount rate | 2.00% |  |
Interest cost discount rate | 1.70% |  |
Discount rate |  | 3.00% | 3.10%
Non-U.S. Plans | Equity | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Assumptions for pension expense, assumed rate of return | 30.00% |  |
Non-U.S. Plans | Fixed income securities | Pension Plan |  |  |
Defined Benefit Plan Disclosure |  |  |
Assumptions for pension expense, assumed rate of return | 70.00% |  |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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 Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition The number of employer shares or related party shares included in plan assets. + 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 (n) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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 (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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