Retirement Plans (Health Care Cost Trend Rates For Postretirement Health Plans) (Details)	12 Months Ended
Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Participants Under Age 65 [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate for next year	7.50%	7.75%	8.00%
Rate to which the cost trend rate is assumed to decline	4.50%	4.50%	4.50%
Year the rate reaches the ultimate trend rate	2030	2030	2030
Participants Age 65 Or Older [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate for next year	7.00%	7.25%	7.50%
Rate to which the cost trend rate is assumed to decline	4.50%	4.50%	4.50%
Year the rate reaches the ultimate trend rate	2028	2028	2028

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

The ultimate trend rate for health care costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

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

+ References

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