ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 279,197
Other comprehensive income (loss) before reclassifications	$ 1,047	$ (2,442)	(801)	$ (2,213)
Amounts reclassified from accumulated other comprehensive income	(30)	111	246	(1,875)
Tax effects	7	(12)	(59)	(100)
Balance, end of period	322,972	282,060	322,972	282,060
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	1,849	3,148	3,487	4,993
Balance, end of period	2,873	805	2,873	805
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	5,948	9,057	7,796	11,179
Other comprehensive income (loss) before reclassifications	1,047	(2,442)	(801)	(2,213)
Amounts reclassified from accumulated other comprehensive income	0	61	0	(2,290)
Tax effects	0	0	0	0
Balance, end of period	6,995	6,676	6,995	6,676
Unamortized Loss on Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(4,099)	(5,909)	(4,309)	(6,186)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	(30)	50	246	415
Tax effects	7	(12)	(59)	(100)
Balance, end of period	$ (4,122)	$ (5,871)	$ (4,122)	$ (5,871)