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Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($) | 3 Months Ended | 37 Months Ended | 41 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2016 | Dec. 26, 2014 | Oct. 31, 2010 | Mar. 28, 2014 | Sep. 25, 2015
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Options outstanding to purchase |  |  |  |  | 8,835,000
Year end stock price | $ 33.65 |  |  |  |
Percentage of vesting per year |  |  | 50.00% |  |
Common stock, dividends declared (in dollars per share) | $ 0.12 | $ 0.10 |  |  |
Remaining authorization to purchase additional shares | $ 113,300,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Stock options expected to vest | $ 90,700,000 |  |  |  |
Employee stock options expected to be recognized over a weighted-average period | 2 years 10 months 24 days |  |  |  |
Executive Officer [Member] | Performance-Based Stock Options [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 419,623 |  |  |  |
Employees and Officers [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Options vesting period | 4 years |  |  |  |
Awards Granted Prior to November 2010 [Member] | Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Options vesting period |  |  | 3 years | 1 year |
Awards Granted After November 2010 [Member] | Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Options vesting period |  |  | 2 years |  |
Awards Granted Under 2005 Stock Plan Prior To February 2011 [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Terms for issuance of stock | 2 |  |  |  |
Awards Granted Under 2005 Stock Plan From February 2011 [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Terms for issuance of stock | 1.6 |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Percentage of compensation withheld by employees to purchase common stock | 10.00% |  |  |  |
Common stock purchase price determined over percentage of closing price | 15.00% |  |  |  |
Employee Stock Option [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Stock options expected to vest | $ 45,500,000 |  |  |  |
Employee stock options expected to be recognized over a weighted-average period | 2 years 8 months 12 days |  |  |  |
Class A Common Stock [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Common stock, shares authorized (shares) | 500,000,000 |  |  |  | 500,000,000
Common stock, shares issued (shares) | 52,089,249 |  |  |  | 50,291,426
Common stock, shares outstanding (shares) | 52,089,249 |  |  |  | 50,291,426
Class A Common Stock [Member] | 2005 Stock Plan. [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Shares authorized under plan | 29,000,000 |  |  |  |
Options outstanding to purchase | 10,684,000 |  |  |  |
Weighted average remaining contractual life | 7 years 6 months |  |  |  |
Options vested and exercisable | 5,188,000 |  |  |  |
Class A Common Stock [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Maximum value of common stock available for eligible employees | $ 25,000 |  |  |  |
Maximum number of common stock available for eligible employees | 1,000 |  |  |  |
Purchase period | 6 months |  |  |  |
Look back commencement period | 1 year |  |  |  |
Class B Common Stock [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Common stock, shares authorized (shares) | 500,000,000 |  |  |  | 500,000,000
Common stock, shares issued (shares) | 48,681,489 |  |  |  | 50,743,311
Common stock, shares outstanding (shares) | 48,681,489 |  |  |  | 50,743,311
Options Granted Prior To June 2008 [Member] | Employee Stock Option [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Options expiration period | 10 years |  |  |  |
Options Granted From June 2008 [Member] | Employee Stock Option [Member] |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Options vesting period | 4 years |  |  |  |
Percentage of stock option becoming exercisable subjected to date of grant | 25.00% |  |  |  |

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