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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes by Component) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Jan. 01, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | $ 458,505 |
Other comprehensive loss before reclassifications | (423) | $ 2,442
Amounts reclassified from accumulated other comprehensive income | 21 | 135
Tax effects | (5) | (34)
Balance, end of period | 466,613 | 398,612
Accumulated Other Comprehensive Income (Loss) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 7,386 | 4,717
Balance, end of period | 6,979 | 7,260
Foreign Currency Translation Adjustment |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 7,606 | 7,323
Other comprehensive loss before reclassifications | (423) | 2,442
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Tax effects | 0 | 0
Balance, end of period | 7,183 | 9,765
Unamortized Loss on Defined Benefit Pension Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | (220) | (2,606)
Other comprehensive loss before reclassifications | 0 | 0
Amounts reclassified from accumulated other comprehensive income | 21 | 135
Tax effects | (5) | (34)
Balance, end of period | $ (204) | $ (2,505)

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