Composition Of Certain Financial Statement Captions (Schedule Of Intangible Assets) (Details) (USD $) In Thousands | Sep. 30, 2011 | Sep. 24, 2010 |
|---|---|---|
| Finite-Lived Intangible Assets [Line Items] | ||
| Cost | $ 118,730 | $ 118,837 |
| Accumulated Amortization | (67,157) | (51,818) |
| Net | 51,573 | 67,019 |
Other Intangibles [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Cost | 20,308 | 20,307 |
| Accumulated Amortization | (16,127) | (12,254) |
| Net | 4,181 | 8,053 |
Acquired Patents And Technology [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Cost | 61,611 | 61,767 |
| Accumulated Amortization | (32,146) | (24,986) |
| Net | 29,465 | 36,781 |
Customer Relationships [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Cost | 30,748 | 30,790 |
| Accumulated Amortization | (12,821) | (10,095) |
| Net | 17,927 | 20,695 |
Customer Contracts [Member] | ||
| Finite-Lived Intangible Assets [Line Items] | ||
| Cost | 6,063 | 5,973 |
| Accumulated Amortization | (6,063) | (4,483) |
| Net | $ 1,490 |