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