Retirement Plans (Schedule of Actuarial Assumptions) (Details)	12 Months Ended
Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
United States
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	4.00%	3.30%	3.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	2.80%	4.00%	3.30%
Rate of compensation increase	0.00%	0.00%	0.00%
Foreign Plan
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	2.00%	1.90%	1.80%
Rate of compensation increase	2.50%	2.50%	2.50%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	1.30%	2.00%	1.90%
Rate of compensation increase	2.50%	2.50%	2.50%
Postretirement Benefits
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	4.10%	3.40%	3.70%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	3.00%	4.10%	3.40%
Healthcare Cost Trend Assumptions
Healthcare cost trend rate assumed for next fiscal year	5.80%	6.30%
Rate to which the cost trend rate is assumed to decline	4.50%	4.50%
Fiscal year the ultimate trend rate is achieved	2038	2038

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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-Publisher FASB
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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Ultimate trend rate for health care cost for defined benefit postretirement plan.

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Year ultimate health care cost trend rate is expected to be reached, in CCYY format.

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