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Fair Value Measurements (Financial Assets and Liabilities Categorized Based Upon the Fair Value Hierarchy) (Details) (USD $)
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Jun. 26, 2011
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Dec. 26, 2010
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|---|---|---|---|---|---|---|
| Total financial assets | $ 26,109,000 | [1] | $ 129,955,000 | [1] | ||
| Total financial liabilities | 1,799,000 | 1,180,000 | ||||
| Total short-term investments and cash equivalents excludes cash | 288,000,000 | 224,300,000 | ||||
| Certificates of deposits holding | 26,100,000 | Â | ||||
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Treasury Bills [Member]
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 |  | ||||
| Total financial assets | 129,955,000 | |||||
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Treasury Bills [Member] | Level 1 [Member]
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 |  | ||||
| Total financial assets | 129,955,000 | |||||
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Treasury Bills [Member] | Level 2 [Member]
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 |  | ||||
| Total financial assets | ||||||
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Treasury Bills [Member] | Level 3 [Member]
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 |  | ||||
| Total financial assets | ||||||
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Certificates of Deposits [Member]
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 |  | ||||
| Total financial assets | 26,109,000 | Â | ||||
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Certificates of Deposits [Member] | Level 1 [Member]
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 |  | ||||
| Total financial assets | ||||||
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Certificates of Deposits [Member] | Level 2 [Member]
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 |  | ||||
| Total financial assets | 26,109,000 | |||||
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Certificates of Deposits [Member] | Level 3 [Member]
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 |  | ||||
| Total financial assets | ||||||
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Interest Rate Swaps [Member]
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 |  | ||||
| Total financial liabilities | 1,799,000 | 1,180,000 | ||||
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Interest Rate Swaps [Member] | Level 1 [Member]
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 |  | ||||
| Total financial liabilities | ||||||
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Interest Rate Swaps [Member] | Level 2 [Member]
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 |  | ||||
| Total financial liabilities | 1,799,000 | 1,180,000 | ||||
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Interest Rate Swaps [Member] | Level 3 [Member]
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 |  | ||||
| Total financial liabilities | ||||||
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Level 1 [Member]
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 |  | ||||
| Total financial assets | 129,955,000 | |||||
| Total financial liabilities | ||||||
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Level 2 [Member]
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 |  | ||||
| Total financial assets | 26,109,000 | |||||
| Total financial liabilities | 1,799,000 | 1,180,000 | ||||
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Level 3 [Member]
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 |  | ||||
| Total financial assets | ||||||
| Total financial liabilities | ||||||
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