Annual report pursuant to Section 13 and 15(d)

Common Stock and Stock-Based Incentive Compensation Plans (Details) (Weighted Average Valuation Assumptions for PRSUs)

v3.8.0.1
Common Stock and Stock-Based Incentive Compensation Plans (Details) (Weighted Average Valuation Assumptions for PRSUs) - $ / shares
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Dec. 29, 2017
Sep. 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (USD per share)       $ 10.28 $ 6.00
Performance-based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (USD per share) $ 12.83 $ 5.14      
Expected volatility 64.39% 57.83%      
Risk-free interest rate 1.50% 0.88%      
Expected dividend payments 0.00% 0.00% 0.00%    
Expected life 3 years 3 years 26 days      
Performance-based Restricted Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (USD per share)     $ 1.85    
Expected volatility     48.88%    
Risk-free interest rate     1.08%    
Expected life     2 years 9 months 4 days    
Performance-based Restricted Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share price (USD per share)     $ 1.99    
Expected volatility     51.69%    
Risk-free interest rate     1.12%    
Expected life     3 years