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