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Summary Of Significant Accounting Policies (Schedule Of Goodwill) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2016 | Sep. 30, 2016 | Oct. 02, 2015 | Oct. 03, 2014
Goodwill [Line Items] |  |  |  |
Goodwill, balance at beginning of period |  | $ 14,292 | $ 14,416 |
Acquisitions |  | 3,046 |  |
Impairment |  | (6,197) | 0 |
Amount attributable to movements in foreign currency rates |  | 55 | (124) |
Goodwill, Balance at end of period |  | 11,196 | 14,292 |
Gross Goodwill |  | 63,783 | 60,682 | $ 60,806
Accumulated Impairment |  | (52,587) | (46,390) | $ (46,390)
Marine Electronics [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, balance at beginning of period |  | 10,367 | 10,367 |
Acquisitions |  | 827 |  |
Impairment |  |  |  |
Amount attributable to movements in foreign currency rates |  | 2 |  |
Goodwill, Balance at end of period |  | 11,196 | 10,367 |
Diving [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, balance at beginning of period |  | 3,925 | 4,049 |
Acquisitions |  | 2,219 |  |
Impairment | $ (6,197) | (6,197) |  |
Amount attributable to movements in foreign currency rates |  | 53 | (124) |
Goodwill, Balance at end of period | $ 0 |  | 3,925 |
Outdoor Equipment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, balance at beginning of period |  |  | $ 0 |

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