Segments of Business (Summary of Operations by Business Unit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2016	Apr. 03, 2015	Apr. 01, 2016	Apr. 03, 2015	Oct. 02, 2015
Segment Reporting Information [Line Items]
Net sales	$ 134,192	$ 133,111	$ 219,490	$ 203,933
Operating profit (loss)	15,138	7,623	14,238	292
Total assets (end of period)	354,789	342,851	354,789	342,851	$ 299,204
Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(380)	(338)	(718)	(453)
Eliminations [Member] | Marine Electronics [Member]
Segment Reporting Information [Line Items]
Net sales	128	112	170	126
Eliminations [Member] | Outdoor Equipment [Member]
Segment Reporting Information [Line Items]
Net sales	7	8	15	17
Eliminations [Member] | Watercraft [Member]
Segment Reporting Information [Line Items]
Net sales	21	13	26	20
Eliminations [Member] | Diving [Member]
Segment Reporting Information [Line Items]
Net sales	224	205	507	290
Operating Segments [Member] | Marine Electronics [Member]
Segment Reporting Information [Line Items]
Net sales	90,865	89,226	149,423	132,755
Operating profit (loss)	17,283	11,130	22,978	9,543
Total assets (end of period)	168,007	170,510	168,007	170,510	125,113
Operating Segments [Member] | Outdoor Equipment [Member]
Segment Reporting Information [Line Items]
Net sales	11,609	12,149	17,915	18,522
Operating profit (loss)	999	1,070	797	725
Total assets (end of period)	34,261	35,053	34,261	35,053	33,663
Operating Segments [Member] | Watercraft [Member]
Segment Reporting Information [Line Items]
Net sales	14,730	13,893	21,103	19,341
Operating profit (loss)	831		296	(1,026)
Total assets (end of period)	33,329	32,255	33,329	32,255	20,898
Operating Segments [Member] | Diving [Member]
Segment Reporting Information [Line Items]
Net sales	16,836	17,708	30,845	33,137
Operating profit (loss)	(704)	(369)	(2,578)	(705)
Total assets (end of period)	67,267	63,830	67,267	63,830	62,589
Operating Segments [Member] | Other / Corporate [Member]
Segment Reporting Information [Line Items]
Net sales	152	135	204	178
Operating profit (loss)	(3,271)	(4,208)	(7,255)	(8,245)
Total assets (end of period)	$ 51,925	$ 41,203	$ 51,925	$ 41,203	$ 56,941