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Cash and Investments Cash and Investments Textual (Details) (USD $)	3 Months Ended	6 Months Ended
	Mar. 31, 2012	Jun. 29, 2013
Cash and Investments Additional Disclosures [Abstract]
Maximum maturity period of Available-for-sale marketable securities, classified as cash equivalents		90 days
Minimum maturity period of Available-for-sale marketable securities, classified as marketable securities		90 days
Unrealized gains or losses on marketable securities	$ 0	$ 0
Maximum period of available for sale securities debt maturities		2 years

The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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