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SEGMENTS OF BUSINESS (Schedule Of Operations By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net sales:	$ 91,132	$ 170,779	$ 165,778	$ 116,579	$ 91,755	$ 155,274	$ 149,807	$ 93,729	$ 544,268	$ 490,565	$ 433,727
Total assets:	395,936				353,659				395,936	353,659
Long-term assets:	98,494				90,178				98,494	90,178
United States:
Segment Reporting Information [Line Items]
Net sales:									456,816	404,073	357,592
Total assets:	316,903				276,916				316,903	276,916
Long-term assets:	91,949				83,726				91,949	83,726
Europe:
Segment Reporting Information [Line Items]
Net sales:									37,014	34,521	32,069
Total assets:	42,048				42,956				42,048	42,956
Long-term assets:	3,553				3,396				3,553	3,396
Canada:
Segment Reporting Information [Line Items]
Net sales:									33,358	32,553	28,308
Other:
Segment Reporting Information [Line Items]
Net sales:									17,080	19,418	15,758
Canada and other
Segment Reporting Information [Line Items]
Total assets:	36,985				33,787				36,985	33,787
Long-term assets:	$ 2,992				$ 3,056				2,992	3,056
Interunit transfers
Segment Reporting Information [Line Items]
Net sales:									(31,580)	(30,732)	(24,574)
Interunit transfers \| United States:
Segment Reporting Information [Line Items]
Net sales:									20,886	19,725	14,672
Interunit transfers \| Europe:
Segment Reporting Information [Line Items]
Net sales:									10,438	10,983	9,824
Interunit transfers \| Canada:
Segment Reporting Information [Line Items]
Net sales:									25	2	16
Interunit transfers \| Other:
Segment Reporting Information [Line Items]
Net sales:									$ 231	$ 22	$ 62