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Equity Incentive Plans and Stock-Based Compensation (Details) - shares
 6 Months Ended
Apr. 23, 2015
Jun. 30, 2015
Employee Stock [Member]    
Stock-Based Compensation    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,000,000  
Shares available for grant    
Shares available, at the end of the period   2,607,944
Stock-Based Incentive Compensation Plans    
Stock-Based Compensation    
Number of shares reserved under the 2006 Purchase Plan 4,000,000 35,400,000
Shares available for grant    
Shares available, at the beginning of the year   10,724,228
Increase in shares approved for issuance   4,000,000
Stock options granted (in shares)   (362,335)
Stock options forfeited (in shares)   1,369,490
Stock options expired under former plans (in shares)   (618,722)
Nonvested equity stock and stock units granted (in shares) [1],[2]   (2,611,833)
Nonvested equity stock and stock units forfeited (in shares) [2]   132,112
Shares available, at the end of the period   12,632,940
Conversion factor used to calculate the decrease in the number of shares available for grant resulting from the grant of restricted stock awards   1.5
Conversion factor used to calculate the increase in the number of shares available for grant resulting from the forfeiture of restricted stock awards   1.5
Potential Additional Performance Stock Units [Domain]    
Shares available for grant    
Nonvested equity stock and stock units granted (in shares) [1],[2]   238,980
[1] (2)Amount includes 238,980 shares that have been reserved for potential future issuance related to certain performance unit awards discussed under the section titled "Nonvested Equity Stock and Stock Units" below.
[2] For purposes of determining the number of shares available for grant under the 2015 Plan (and previously the 2006 Plan) against the maximum number of shares authorized, each share of restricted stock granted reduces the number of shares available for grant by 1.5 shares and each share of restricted stock forfeited increases shares available for grant by 1.5 shares.