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Note 6 - Pension Plans - Allocation of Pension Assets (Details) - Pension Plan [Member]	Sep. 29, 2019	Sep. 30, 2018
Defined Benefit Plan, Equity Securities [Member]
Asset Percentage, Policy Allocation	50.00%
Asset Percentage, Actual Allocation	49.00%	50.00%
Defined Benefit Plan, Debt Security [Member]
Asset Percentage, Policy Allocation	35.00%
Asset Percentage, Actual Allocation	34.00%	32.00%
TIPS [Member]
Asset Percentage, Policy Allocation	5.00%
Asset Percentage, Actual Allocation	5.00%	4.00%
Hedge Funds [Member]
Asset Percentage, Policy Allocation	10.00%
Asset Percentage, Actual Allocation	10.00%	10.00%
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Asset Percentage, Policy Allocation
Asset Percentage, Actual Allocation	2.00%	4.00%

X

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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X

- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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