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Investment in TowerJazz Semiconductor Ltd. (Narrative) (Details) (TowerJazz [Member], USD $) | 3 Months Ended |
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Apr. 01, 2012 | Jul. 01, 2012
TowerJazz [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number of shares held |  | 644,543
Net unrealized gain on available-for-sale securities |  | $ 76,000
Available-for-sale securities, cost per share |  | $ 0.13
Available-for-sale securities, carrying value per share |  | $ 0.67
Tax beneift related to accumulated other comprehensive income | $ 63,000 |

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