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Investments (Details) (USD $)	3 Months Ended
Investments (Details) (USD $)	Apr. 01, 2012	Jul. 01, 2012	Jan. 01, 2012
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Held to Maturity Securities, Debt Maturities, Term	5 years
Restricted long-term marketable securities		$ 9,383,000	$ 9,145,000
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Money market funds		$ 165,000,000	$ 187,500,000

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for greater than one year or the normal operating cycle, whichever is longer and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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