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Note 8 - Pension Plans - Assumptions (Details) | 12 Months Ended
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Sep. 26, 2021 | Sep. 27, 2020 | Sep. 29, 2019
Interest crediting rate | 2.50% | 2.50% |
Pension Plan [Member] |  |  |
Discount rate | 2.70% | 2.80% |
Discount rate - service cost | 3.00% | 3.30% | 4.20%
Discount rate - interest cost | 1.90% | 2.60% | 3.90%
Expected long-term return on plan assets | 5.90% | 6.00% | 5.50%

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- Definition Weighted average rate for present value of future retirement benefits cash flows attributed to the cost recognized for passage of time, used to determine net periodic benefit cost of defined benefit plan. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows attributed to service rendered by employee, used to determine net periodic benefit cost of defined benefit plan. + References No definition available. + Details
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- Definition 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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- Details
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