|
Note 7. Equity Incentive Plan and Stock-based Compensation (Details) - Restricted Stock Unit Award Activities (Restricted Stock Units (RSUs) [Member], USD $)
|
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 28, 2014
|
Dec. 29, 2013
|
Dec. 30, 2012
|
Dec. 25, 2011
|
|
|
Restricted Stock Units (RSUs) [Member]
|
||||
| Note 7. Equity Incentive Plan and Stock-based Compensation (Details) - Restricted Stock Unit Award Activities [Line Items] | ||||
| Shares, unvested | 2,040,187 | 2,384,712 | 2,518,916 | 2,143,035 |
| Amount, unvested | $ 16.19 | $ 14.01 | $ 13.72 | $ 14.94 |
| Shares, granted | 1,568,509 | 1,137,388 | 1,328,143 | |
| Amount, granted | $ 16.19 | $ 12.33 | $ 10.37 | |
| Shares, forfeited | (123,989) | (312,744) | (299,543) | |
| Amount, forfeited | $ 13.25 | $ 12.70 | $ 13.37 | |
| Shares, vested | (1,789,045) | (958,848) | (652,719) | |
| Amount, vested | $ 13.49 | $ 11.67 | $ 11.10 | |