ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes by Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 27, 2019	Dec. 28, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 324,534
Other comprehensive income before reclassifications	700	$ (1,700)
Amounts reclassified from accumulated other comprehensive income	82	138
Tax effects	(21)	(33)
Balance, end of period	330,239	279,567
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	1,558	3,487
Balance, end of period	2,319	1,892
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	4,790	7,796
Other comprehensive income before reclassifications	700	(1,700)
Amounts reclassified from accumulated other comprehensive income	0	0
Tax effects	0	0
Balance, end of period	5,490	6,096
Unamortized Loss on Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(3,232)	(4,309)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	82	138
Tax effects	(21)	(33)
Balance, end of period	$ (3,171)	$ (4,204)