|
Marketable Securities (Available for Sale Securities Measured at Estimated Fair Value on Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 28, 2013
|
Dec. 29, 2012
|
|---|---|---|
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | $ 1,728,397 | $ 1,641,395 |
|
Fair Value, Measurements, Recurring [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 1,728,397 | 1,641,395 |
|
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 518,840 | 650,895 |
|
Fair Value, Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 690,615 | 499,857 |
|
Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 420,345 | 399,941 |
|
Fair Value, Measurements, Recurring [Member] | Common Stock [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 27,435 | 22,982 |
|
Fair Value, Measurements, Recurring [Member] | Other securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 71,162 | 67,720 |
|
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 27,435 | 22,982 |
|
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage-Backed Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Obligations of States and Political Subdivisions [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Bond Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Common Stock [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 27,435 | 22,982 |
|
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 1,700,962 | 1,618,413 |
|
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage-Backed Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 518,840 | 650,895 |
|
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Obligations of States and Political Subdivisions [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 690,615 | 499,857 |
|
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Bond Securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 420,345 | 399,941 |
|
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Common Stock [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | 0 | 0 |
|
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other securities [Member]
|
||
| Schedule of Available-for-sale Securities [Line Items] | ||
| Available-for-sale Securities, Total | $ 71,162 | $ 67,720 |