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Note 6 - Pension Plans (Tables) - Pension Plan [Member] | 12 Months Ended
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Sep. 29, 2019
Notes Tables |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
(Thousands of Dollars) |  | 2019 |  |  | 2018 |  |  | 2017 |
Service cost for benefits earned during the year |  |  | 36 |  |  |  | 48 |  |  |  | 84 |
Interest cost on projected benefit obligation |  |  | 6,563 |  |  |  | 5,754 |  |  |  | 5,394 |
Expected return on plan assets |  |  | (8,073 | ) |  |  | (7,933 | ) |  |  | (7,878 | )
Amortization of net loss |  |  | 1,135 |  |  |  | 2,025 |  |  |  | 2,947 |
Amortization of prior service benefit |  |  | (100 | ) |  |  | (136 | ) |  |  | (136 | )
Net periodic pension cost (benefit) |  |  | (439 | ) |  |  | (242 | ) |  |  | 411 |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
(Thousands of Dollars) |  | 2019 |  |  | 2018 |
Benefit obligation, beginning of year |  |  | 176,531 |  |  |  | 191,645 |
Service cost |  |  | 36 |  |  |  | 48 |
Interest cost |  |  | 6,563 |  |  |  | 5,754 |
Actuarial loss (gain) |  |  | 20,687 |  |  |  | (9,464 | )
Benefits paid |  |  | (11,448 | ) |  |  | (11,452 | )
Benefit obligation, end of year |  |  | 192,369 |  |  |  | 176,531 |
Fair value of plan assets, beginning of year: |  |  | 151,255 |  |  |  | 149,762 |
Actual return on plan assets |  |  | 8,705 |  |  |  | 10,576 |
Benefits paid |  |  | (11,448 | ) |  |  | (11,452 | )
Administrative expenses paid |  |  | (2,163 | ) |  |  | (2,571 | )
Employer contributions |  |  | 650 |  |  |  | 4,940 |
Fair value of plan assets, end of year |  |  | 146,999 |  |  |  | 151,255 |
Funded status |  |  | (45,370 | ) |  |  | (25,276 | )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
|  | September 29 |  |  | September 30 |
(Thousands of Dollars) |  | 2019 |  |  | 2018 |
Pension obligations |  |  | (45,370 | ) |  |  | (25,276 | )
Accumulated other comprehensive loss (before income taxes) |  |  | (53,066 | ) |  |  | (31,882 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | September 29 |  |  | September 30 |
(Thousands of Dollars) |  | 2019 |  |  | 2018 |
Unrecognized net actuarial loss |  |  | (53,072 | ) |  |  | (31,988 | )
Unrecognized prior service benefit |  |  | 6 |  |  |  | 106 |
|  |  | (53,066 | ) |  |  | (31,882 | )
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | September 29 |  |  | September 30 |
(Percent) |  | 2019 |  |  | 2018 |
Discount rate |  |  | 3.1 |  |  |  | 4.2 |
(Percent) |  | 2019 |  |  | 2018 |  |  | 2017 |
Discount rate - service cost |  |  | 4.2 |  |  |  | 3.7 |  |  |  | 3.5 |
Discount rate - interest cost |  |  | 3.9 |  |  |  | 3.1 |  |  |  | 2.8 |
Expected long-term return on plan assets |  |  | 5.5 |  |  |  | 5.5 |  |  |  | 5.5 |
Defined Benefit Plan, Plan Assets, Allocation [Table Text Block] |
(Percent) |  | Policy Allocation |  |  |  | Actual Allocation |
|  | September 29 |  |  | September 29 |  |  | September 30 |
Asset Class |  | 2019 |  |  | 2019 |  |  | 2018 |
Equity securities |  |  | 50 |  |  |  | 49 |  |  |  | 50 |
Debt securities |  |  | 35 |  |  |  | 34 |  |  |  | 32 |
TIPS |  |  | 5 |  |  |  | 5 |  |  |  | 4 |
Hedge fund investments |  |  | 10 |  |  |  | 10 |  |  |  | 10 |
Cash and cash equivalents |  |  | — |  |  |  | 2 |  |  |  | 4 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
(Thousands of Dollars) |  | NAV |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash and cash equivalents |  |  | — |  |  |  | 2,970 |  |  |  | — |  |  |  | — |
Domestic equity securities |  |  | 9,524 |  |  |  | 8,971 |  |  |  | 40,593 |  |  |  | — |
International equity securities |  |  | — |  |  |  | 6,525 |  |  |  | 7,283 |  |  |  | — |
TIPS |  |  | — |  |  |  | 6,918 |  |  |  | — |  |  |  | — |
Debt securities |  |  | — |  |  |  | 26,392 |  |  |  | 24,190 |  |  |  | — |
Hedge fund investments |  |  | 15,733 |  |  |  | — |  |  |  | — |  |  |  | — |
(Thousands of Dollars) |  | NAV |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Cash and cash equivalents |  |  | — |  |  |  | 5,537 |  |  |  | — |  |  |  | — |
Domestic equity securities |  |  | 10,045 |  |  |  | 12,573 |  |  |  | 40,083 |  |  |  | — |
International equity securities |  |  | — |  |  |  | 7,070 |  |  |  | 7,560 |  |  |  | — |
TIPS |  |  | — |  |  |  | 6,535 |  |  |  | — |  |  |  | — |
Debt securities |  |  | — |  |  |  | 25,673 |  |  |  | 22,523 |  |  |  | — |
Hedge fund investments |  |  | 15,767 |  |  |  | — |  |  |  | — |  |  |  | — |
Schedule of Expected Benefit Payments [Table Text Block] |
(Thousands of Dollars) |  |  |
2020 |  | 12,452 |
2021 |  | 11,770 |
2022 |  | 11,711 |
2023 |  | 11,725 |
2024 |  | 11,679 |
2025-2029 |  | 56,172 |

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