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PENSION PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 27, 2020 | Mar. 29, 2019 | Mar. 27, 2020 | Mar. 29, 2019
Retirement Benefits [Abstract] |  |  |  |
Pension plan contributions | $ 44 | $ 45 | $ 88 | $ 90
Components of net periodic benefit cost: |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest on projected benefit obligation | 276 | 264 | 551 | 529
Less estimated return on plan assets | 214 | 191 | 427 | 382
Amortization of unrecognized losses | 82 | 139 | 164 | 277
Net periodic benefit cost | $ 144 | $ 212 | $ 288 | $ 424

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