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Investment in TowerJazz Semiconductor Ltd. (Narrative) (Details) (TowerJazz [Member], USD $)	3 Months Ended
	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

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

Tax effect of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.