|
Marketable Securities (Additional information) (Details) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended |
|---|---|---|
|
Sep. 28, 2013
|
Dec. 29, 2012
|
|
| Gross Unrealized Losses | $ (48,191) | $ (6,884) |
| Change In Treasury Bond Yield Description | The decline was due to increases in the 10 Year Treasury Bond Yield during the second and third quarters, which caused market valuations of certain securities in our investment portfolios to decline. | |
| Held To Maturity Securities Continuous Unrealized Loss Position Percentage | 47.00% | |
| Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value, Total | 1,116,862 | |
| Available For Sale Securities Continuous Unrealized Loss Position Amortization Cost | $ 1,165,053 |