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Employee Benefit Plans (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012
Employee Benefit Plans [Line Items] |  |  |
Percentage match of eligible compensation contributed to investment selection | 25.00% |  |
Percentage of eligible compensation contributed to investment selection for which matching contribution is made | 2.00% |  |
Total accumulated benefit obligation | $ 877,846 | $ 766,870 |
Fair values of plan assets total | 706,431 |  |
Number of plans | 3 | 2 |
Fair value of plan assets exceeding accumulated benefit obligations | 627,788 | 549,696 |
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 this rate | 515 |  |
Decrease in accumulated postretirement benefit obligation due to one percentage point decrease in this rate | 480 |  |
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components | 0 |  |
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components | 0 |  |
Profit share expense | 22,030 | 14,950 | 25,100
U.S. Pension Plans [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Contributions by Employer | 52,500 |  |
Fair values of plan assets total | 585,677 | 498,918 |
Individual pension plan as a percentage of consolidate pension plan | 83.00% |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 8.40% | 8.60% | 8.90%
Percentage of assumed average rate of return in equity securities | 60.00% |  |
Percentage of assumed average rate of return in fixed income securities | 30.00% |  |
Percentage of assumed average rate of return in other securities | 10.00% |  |
Assumptions for benefit obligations, Discount rate | 4.40% | 5.00% | 3.70%
Assumptions for net periodic benefit cost, Discount rate | 5.00% | 3.70% | 4.70%
Non-U.S. Pension Plans [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Contributions by Employer | 9,000 |  |
Fair values of plan assets total | 120,754 | 98,625 |
Individual pension plan as a percentage of consolidate pension plan | 17.00% |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 4.10% | 4.50% | 5.50%
Percentage of assumed average rate of return in equity securities | 40.00% |  |
Percentage of assumed average rate of return in fixed income securities | 60.00% |  |
Assumptions for benefit obligations, Discount rate | 3.10% | 3.60% | 3.90%
Assumptions for net periodic benefit cost, Discount rate | 3.70% | 4.00% | 4.70%
Postretirement Benefit Plan [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Assets for Plan Benefits | 0 |  |
Transition obligation expense period, years | 20 |  |
Assumptions for benefit obligations, Discount rate | 3.90% | 4.50% | 3.30%
Assumptions for net periodic benefit cost, Discount rate | 4.50% | 3.30% | 4.50%
Three Plan Member [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Fair value of plan assets exceeding accumulated benefit obligations | 78,643 |  |
Accumulated benefit obligation of plans with fair value exceeding accumulated benefit obligation | 67,423 |  |
Two Plans [Member] [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Fair value of plan assets exceeding accumulated benefit obligations |  | 47,847 |
Accumulated benefit obligation of plans with fair value exceeding accumulated benefit obligation |  | 40,984 |
Defined Benefit Pension [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Estimated net prior service cost that will be amortized | 92 |  |
Estimated net actuarial loss that will be amortized | 24,782 |  |
Medical And Drug Costs Before Age Sixty Five Member |  |  |
Employee Benefit Plans [Line Items] |  |  |
Annual per capita rate of increase of medical and drug costs | 7.20% |  |
Medical Costs After Age Sixty Five Member |  |  |
Employee Benefit Plans [Line Items] |  |  |
Annual per capita rate of increase of medical and drug costs | 6.70% |  |
Drug Costs After Age Sixty Five Member |  |  |
Employee Benefit Plans [Line Items] |  |  |
Annual per capita rate of increase of medical and drug costs | 7.50% |  |
UNITED KINGDOM |  |  |
Employee Benefit Plans [Line Items] |  |  |
Individual pension plan as a percentage of consolidate pension plan | 6.00% |  |
Class A Common Stock [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Number of shares owned by the participants under RSP | 552,011 |  |
Class A Common Stock [Member] | U.S. Pension Plans [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Number of stock included in plan assets | 149,022 |  |
Class B Common Stock [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Number of shares owned by the participants under RSP | 1,684,812 |  |
Class B Common Stock [Member] | U.S. Pension Plans [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Number of stock included in plan assets | 1,001,034 |  |
Limited Partnerships [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Unfunded commitments | 20,743 |  |
Limited Partnerships [Member] | U.S. Pension Plans [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Fair values of plan assets total | 81,342 | 71,072 |
Interest In Common Collective Trusts [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Unfunded commitments | 0 |  |
Interest In Common Collective Trusts [Member] | U.S. Pension Plans [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Fair values of plan assets total | $ 153,183 | $ 152,355 |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: 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=35743120&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: 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=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + 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)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of 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 (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: 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 + 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=35743120&loc=d3e1928-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920 + Details
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- Definition The ultimate trend rate for health care costs. + 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=35743120&loc=d3e1928-114920 + Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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