|
Fair Value of Financial Instruments (Details) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
|
Dec. 29, 2012
|
Dec. 31, 2011
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
$ 37,700,365
|
$ 30,259,712
|
|
Corporate fixed income [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
18,213,213
|
13,622,504
|
|
Government securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
208,583
|
205,003
|
|
Municipal bonds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
4,514,074
|
1,955,316
|
|
Equity securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
522,132
|
454,250
|
|
Mutual funds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
1,907,862
|
6,017,255
|
|
Certificates of deposit [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
10,892,141
|
6,700,340
|
|
Asset backed securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
1,442,360
|
1,305,044
|
|
Quoted Prices in Active Markets (Level 1) [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
2,429,994
|
6,471,505
|
|
Quoted Prices in Active Markets (Level 1) [Member] | Corporate fixed income [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Quoted Prices in Active Markets (Level 1) [Member] | Government securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Quoted Prices in Active Markets (Level 1) [Member] | Municipal bonds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Quoted Prices in Active Markets (Level 1) [Member] | Equity securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
522,132
|
454,250
|
|
Quoted Prices in Active Markets (Level 1) [Member] | Mutual funds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
1,907,862
|
6,017,255
|
|
Quoted Prices in Active Markets (Level 1) [Member] | Certificates of deposit [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Quoted Prices in Active Markets (Level 1) [Member] | Asset backed securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Other Observable Inputs (Level 2) [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
35,270,371
|
23,788,207
|
|
Significant Other Observable Inputs (Level 2) [Member] | Corporate fixed income [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
18,213,213
|
13,622,504
|
|
Significant Other Observable Inputs (Level 2) [Member] | Government securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
208,583
|
205,003
|
|
Significant Other Observable Inputs (Level 2) [Member] | Municipal bonds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
4,514,074
|
1,955,316
|
|
Significant Other Observable Inputs (Level 2) [Member] | Equity securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Other Observable Inputs (Level 2) [Member] | Mutual funds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Other Observable Inputs (Level 2) [Member] | Certificates of deposit [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
10,892,141
|
6,700,340
|
|
Significant Other Observable Inputs (Level 2) [Member] | Asset backed securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
1,442,360
|
1,305,044
|
|
Significant Unobservable Inputs (Level 3) [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Corporate fixed income [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Government securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Municipal bonds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Equity securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Mutual funds [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Certificates of deposit [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|
|
Significant Unobservable Inputs (Level 3) [Member] | Asset backed securities [Member]
|
|
|
| Schedule of assets measured at fair value on recurring basis |
|
|
| Total marketable securities |
|
|