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Note 9 - Postretirement and Postemployment Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2021 | Sep. 27, 2020
Unrecognized net actuarial gain | $ 36,965 | $ (41,344)
Other Postretirement Benefits Plan [Member] |  |
Unrecognized net actuarial gain | 14,071 | 4,826
Unrecognized prior service benefit | 3,676 | 9,443
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total | $ 17,747 | $ 14,269

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