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SEGMENTS OF BUSINESS (Schedule Of Operations By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Segment Reporting Information [Line Items]
Net sales:	$ 104,019	$ 176,253	$ 177,707	$ 104,440	$ 91,132	$ 170,779	$ 165,778	$ 116,579	$ 562,419	$ 544,268	$ 490,565
Total assets:	436,444				395,936				436,444	395,936
Long-term assets:	102,467				98,494				102,467	98,494
United States:
Segment Reporting Information [Line Items]
Net sales:									482,326	456,816	404,073
Total assets:	356,419				316,903				356,419	316,903
Long-term assets:	96,769				91,949				96,769	91,949
Europe:
Segment Reporting Information [Line Items]
Net sales:									35,114	37,014	34,521
Total assets:	41,333				42,048				41,333	42,048
Long-term assets:	3,294				3,553				3,294	3,553
Canada:
Segment Reporting Information [Line Items]
Net sales:									30,039	33,358	32,553
Other:
Segment Reporting Information [Line Items]
Net sales:									14,940	17,080	19,418
Canada and other
Segment Reporting Information [Line Items]
Total assets:	38,692				36,985				38,692	36,985
Long-term assets:	$ 2,404				$ 2,992				2,404	2,992
Interunit transfers
Segment Reporting Information [Line Items]
Net sales:									(30,812)	(31,580)	(30,732)
Interunit transfers \| United States:
Segment Reporting Information [Line Items]
Net sales:									20,991	20,886	19,725
Interunit transfers \| Europe:
Segment Reporting Information [Line Items]
Net sales:									9,792	10,438	10,983
Interunit transfers \| Canada:
Segment Reporting Information [Line Items]
Net sales:									0	25	2
Interunit transfers \| Other:
Segment Reporting Information [Line Items]
Net sales:									$ 29	$ 231	$ 22