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Note 8 - Postretirement and Postemployment Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Thousands | 12 Months Ended
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Sep. 27, 2020 | Sep. 29, 2019
Unrecognized net actuarial gain | $ 4,826 | $ 4,970
Unrecognized prior service benefit | 9,443 | 9,848
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total | $ 14,269 | $ 14,818

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