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Stockholders' Equity - Stock Option Plans and Restricted Stock Units Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2014
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
May 31, 2017
Mar. 28, 2014
Mar. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock awards granted 0 7,000          
Number of shares available for issuance (in shares)           1,550,000 2,306,256
Total number of awards outstanding (shares)             5,511,322
Total unrecognized stock-based compensation expense related to nonvested options   $ 0.1          
Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based incentive award vesting period   10 years          
Stock Options and Restricted Stock Units | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based incentive award vesting period   10 years          
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized stock-based compensation expense, period for recognition   6 months          
Stock options | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based incentive award vesting period   6 years          
Award term or expiration period   10 years          
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized stock-based compensation expense, period for recognition   3 years 1 month 6 days          
Total unrecognized stock-based compensation expense related to nonvested restricted stock units   $ 7.2          
Fair value of vested awards   $ 6.3 $ 4.7 $ 3.6      
2014 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares available for issuance (in shares)   3,954,912     2,500,000    
Total number of awards outstanding (shares)             5,511,322