Composition Of Certain Financial Statement Captions (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands | Sep. 30, 2011 | Sep. 24, 2010 |
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| Composition Of Certain Financial Statement Captions [Abstract] | ||
| Accumulated foreign currency translation gains, net of tax of ($2,655) and ($2,653) | $ 6,834 | $ 6,195 |
| Accumulated unrealized gains on available-for-sale securities, net of tax of ($986) and ($387) | 699 | 1,606 |
| Total accumulated other comprehensive income | 7,533 | 7,801 |
| Accumulated foreign currency translation gains, tax | 2,653 | 2,655 |
| Accumulated unrealized gains on available-for-sale securities, tax | $ 387 | $ 986 |
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- Definition Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax
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- Definition Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax
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- Definition Composition Of Certain Financial Statement Captions [Abstract]
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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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