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Employee Benefit Plans (Narrative) (Details)
$ in Thousands
 12 Months Ended
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%