Retirement Plans (Schedule of Actuarial Assumptions) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 30, 2016	Dec. 29, 2017	Sep. 30, 2016	Sep. 25, 2015
U.S.
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	2.20%	3.00%	3.90%	3.80%
Expected return on plan assets	3.50%	3.50%	5.80%	6.00%
Rate of compensation increase	0.00%	0.00%	0.00%	0.00%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	3.00%	3.30%	2.30%	3.90%
Rate of compensation increase	0.00%	0.00%	0.00%	0.00%
OUS
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	1.30%	1.80%	2.00%	2.40%
Expected return on plan assets	0.00%	0.00%	2.00%	2.00%
Rate of compensation increase	0.00%	2.50%	0.00%	0.00%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	1.80%	1.90%	1.30%	2.40%
Rate of compensation increase	0.30%	2.50%	0.00%	0.00%
Postretirement Benefits
Weighted Average-Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	3.20%	3.70%	4.00%	3.60%
Weighted-Average Assumptions Used in Calculating Benefit Obligations
Discount rate	3.80%	3.40%	3.20%	3.90%
Healthcare Cost Trend Assumptions
Healthcare cost trend rate assumed for next fiscal year	6.90%	6.90%
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
Effect of One-Percentage Point Change in Assumed Healthcare Cost Trend Rates
One-Percentage-Point Increase, effect on total of service and interest cost		$ 0.0
One-Percentage-Point Decrease, effect on total of service and interest cost		0.0
One-Percentage-Point Increase, effect on postretirement benefit obligation		0.2
One-Percentage-Point Decrease, effect on postretirement obligation		$ (0.4)

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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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
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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 return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, 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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Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

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Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

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Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

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Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.

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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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