ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2020	Jun. 28, 2019	Jun. 28, 2020	Jun. 28, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 324,534
Other comprehensive income before reclassifications	$ 1,537	$ 1,047	630	$ (801)
Amounts reclassified from accumulated other comprehensive income	240	(30)	404	246
Tax effects	(60)	7	(101)	(59)
Balance, end of period	361,534	322,972	361,534	322,972
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	774	1,849	1,558	3,487
Balance, end of period	2,491	2,873	2,491	2,873
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	3,883	5,948	4,790	7,796
Other comprehensive income before reclassifications	1,537	1,047	630	(801)
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Tax effects	0	0	0	0
Balance, end of period	5,420	6,995	5,420	6,995
Unamortized Loss on Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(3,109)	(4,099)	(3,232)	(4,309)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	240	(30)	404	246
Tax effects	(60)	7	(101)	(59)
Balance, end of period	$ (2,929)	$ (4,122)	$ (2,929)	$ (4,122)