Employee Benefit Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Oct. 03, 2015 USD ($) shares	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)
Employee Benefit Plans
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	$ 941,266	$ 877,846
Fair values of plan assets total	$ 696,476
Number of plans	3	3
Fair value of plan assets exceeding accumulated benefit obligations	$ 634,406	$ 627,788
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	$ 886,663	810,424
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	$ 384
Decrease in accumulated postretirement benefit obligation due to one percentage point decrease in health care cost trend rate	359
Profit share expense	13,188	22,030	$ 14,950
U.S. Pension Plans
Employee Benefit Plans
Defined Benefit Plan, Estimated future employer contributions in next fiscal year	68,000
Fair values of plan assets total	$ 578,783	$ 585,677
Assumptions for pension expense, average rate of return on plan assets	8.00%	8.40%	8.60%
Assumptions for benefit obligations, Discount rate	4.50%	4.40%	5.00%
Assumptions for net periodic benefit cost, Discount rate	4.40%	5.00%	3.70%
Non-U.S. Pension Plans
Employee Benefit Plans
Defined Benefit Plan, Estimated future employer contributions in next fiscal year	$ 6,700
Fair values of plan assets total	$ 117,693	$ 120,754
Assumptions for pension expense, average rate of return on plan assets	4.50%	4.10%	4.50%
Assumptions for benefit obligations, Discount rate	3.00%	3.10%	3.60%
Assumptions for net periodic benefit cost, Discount rate	3.10%	3.70%	4.00%
Postretirement Benefit Plan
Employee Benefit Plans
Defined Benefit Plan, Assets for Plan Benefits	$ 0
Assumptions for benefit obligations, Discount rate	3.90%	3.90%	4.50%
Assumptions for net periodic benefit cost, Discount rate	4.50%	4.50%	3.30%
Three Plans
Employee Benefit Plans
Fair value of plan assets exceeding accumulated benefit obligations	$ 62,070	$ 78,643
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	54,603	67,423
Defined Benefit Pension
Employee Benefit Plans
Estimated net prior service cost that will be amortized in next fiscal year	111
Estimated net actuarial loss that will be amortized in next fiscal year	$ 28,778
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	7.00%
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	6.70%
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	7.20%
Class A Common Stock
Employee Benefit Plans
Number of shares owned by the participants under RSP | shares	459,928
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	1,465,324
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	60.00%
Equity Securities | Non-U.S. Pension Plans
Employee Benefit Plans
Defined Benefit Plan, Target Plan Asset Allocations	40.00%
Fixed Income Securities | U.S. Pension Plans
Employee Benefit Plans
Defined Benefit Plan, Target Plan Asset Allocations	30.00%
Fixed Income Securities | Non-U.S. Pension Plans
Employee Benefit Plans
Defined Benefit Plan, Target Plan Asset Allocations	60.00%
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	$ 64,760	81,342
Interest In Common Collective Trusts | U.S. Pension Plans
Employee Benefit Plans
Fair values of plan assets total	88,870	153,183
U.S. Pension Plans
Employee Benefit Plans
Defined Contribution Plan, Cost Recognized	13,621	13,196	$ 11,223
Non-U.S. Pension Plans
Employee Benefit Plans
Defined Contribution Plan, Cost Recognized	$ 6,570	$ 6,458	$ 5,672