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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes by Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2021	Dec. 27, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 378,100
Other comprehensive income before reclassifications	2,442	$ 700
Amounts reclassified from accumulated other comprehensive income	135	82
Tax effects	(34)	(21)
Balance, end of period	398,612	330,239
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	4,717	1,558
Balance, end of period	7,260	2,319
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	7,323	4,790
Other comprehensive income before reclassifications	2,442	700
Amounts reclassified from accumulated other comprehensive income	0	0
Tax effects	0	0
Balance, end of period	9,765	5,490
Unamortized Loss on Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,606)	(3,232)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	135	82
Tax effects	(34)	(21)
Balance, end of period	$ (2,505)	$ (3,171)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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