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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 03, 2019
Jun. 14, 2019
Apr. 12, 2019
Apr. 01, 2019
Sep. 28, 2019
Sep. 28, 2019
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Trading price $ 2.38     $ 3.36    
Weighted-average grant-date fair value of options $ 1.18     $ 1.68    
Vesting period 3 years     3 years    
Expiration period 10 years     10 years    
Performance stock units ("PSUs") [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 173,319     892,857    
Weighted-average grant-date fair value of equity instruments other than options $ 0.79     $ 1.77    
Performance stock units ("PSUs") [Member] | Fiscal Years 2019 Through 2022 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 173,319     892,857    
Performance stock units ("PSUs") [Member] | Vest upon the Company achieving annual adjusted EBITDA of $80 million            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Adjusted Earnings Before Interest Tax Depreciation And Amortization $ 80.0     $ 80.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773     297,619    
Performance stock units ("PSUs") [Member] | Vest upon the Company achieving annual adjusted EBITDA of $110 million            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Adjusted Earnings Before Interest Tax Depreciation And Amortization $ 110.0     $ 110.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773     297,619    
Performance stock units ("PSUs") [Member] | Vest upon the Company achieving annual adjusted EBITDA of $140 million            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Adjusted Earnings Before Interest Tax Depreciation And Amortization $ 140.0     $ 140.0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773     297,619    
Performance stock units ("PSUs") [Member] | Vest upon achieving a trading price of $5.00 per share [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Trading price $ 5.00     $ 5.00    
Number of consecutive trading days 20 days     20 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773     297,619    
Performance stock units ("PSUs") [Member] | Vest upon achieving a trading price of $9.00 per share [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Trading price $ 9.00     $ 9.00    
Number of consecutive trading days 20 days     20 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773     297,619    
Performance stock units ("PSUs") [Member] | Vest upon achieving a trading price of $14.00 per share [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Trading price $ 14.00     $ 14.00    
Number of consecutive trading days 20 days     20 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773     297,619    
Mr. Ennen [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate grant-date fair value of stock awards       $ 7.2    
Mr. Ennen [Member] | Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       960,061    
Exercise price of stock option to purchase one common share       $ 3.36    
Trading price         $ 3.36 $ 3.36
Mr. Ennen [Member] | Performance stock units ("PSUs") [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Trading price       $ 3.36 3.36 3.36
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       1,785,714    
Mr. Ennen [Member] | Restricted stock units ("RSUs") [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Trading price       $ 3.36    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       297,619    
Mr. Huckins [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Aggregate grant-date fair value of stock awards $ 1.3          
Mr. Huckins [Member] | Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 262,182          
Exercise price of stock option to purchase one common share $ 2.38          
Trading price         2.38 2.38
Mr. Huckins [Member] | Performance stock units ("PSUs") [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Trading price         $ 2.38 $ 2.38
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 346,638          
Mr. Huckins [Member] | Restricted stock units ("RSUs") [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 173,319          
Short Term Incentive Plan [Member] | Performance stock units ("PSUs") [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average grant-date fair value of options     $ 3.46      
Aggregate grant-date fair value of stock awards         $ 2.3 $ 2.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   2,795,525 2,795,525      
Compensation expense         $ 1.0 $ 1.8