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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 03, 2019
Apr. 01, 2019
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Gross stock-based compensation expense     $ 11,600 $ 7,900 $ 6,400
Net stock-based compensation expense     7,500   5,700
Reversal of previously recognized stock-based compensation expense related to forfeited awards     4,100   700
Employee stock purchase plan     $ 475 $ 630 $ 409
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, Granted     12,400    
Exercise price of stock option to purchase one common share     $ 3.57    
Weighted-average grant-date fair value of options     $ 1.70 $ 3.31 $ 4.12
Compensation costs related to non-vested RSU awards not yet recognized     $ 500    
Vesting period 3 years 3 years 7 months 6 days    
Expiration period 10 years 10 years      
Trading price     $ 3.57 $ 7.56 $ 9.29
Expected life (in years)     5 years 9 months 18 days 6 years 6 years 4 months 24 days
Employee stock purchase plan     $ 500 $ 600 $ 400
Employee stock purchase plan (in shares)     185,415 112,158 61,796
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding     814,500    
Performance stock units ("PSUs") [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, Granted     2,846,962   1,560,535
Weighted-average grant-date fair value of options $ 0.79   $ 3.42 $ 3.42 $ 5.64
Weighted-average grant-date fair value of equity instruments other than options   $ 1.77      
Compensation costs related to non-vested RSU awards not yet recognized     $ 1,900    
Vesting period     3 months 18 days    
Trading price 2.38 3.36     $ 9.33
Expected life (in years)       6 years 6 months 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights     For the year ended December 28, 2019, the Company granted a total of 2,846,962 PSUs to certain employees of the Company under its Short-Term Incentive Plan. The vesting of these PSUs was subject to the Company achieving a predetermined measure of adjusted earnings before interest, taxes, depreciation and amortization ("EBITDA") for fiscal 2019, and is subject to each employee's continued employment with the Company through April 12, 2020 (the requisite service period).   For the year ended December 30, 2017, the Company granted 1,560,535 PSUs to selected employees. The vesting of these PSUs is subject to the satisfaction of certain stock price performance conditions during a three-year performance period ending May 24, 2020. One-third of the PSUs will vest upon achieving a stock price of $11.00, one-third will vest upon achieving a stock price of $14.00, and one-third will vest upon achieving a stock price of $18.00, in each case for 20 consecutive trading days and subject to the employee's continued employment throughout the performance period. Each vested PSU will entitle the employee to receive one common share of the Company without payment of additional consideration.
Restricted stock units ("RSUs") [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, Granted     274,086    
Weighted-average grant-date fair value of options 1.18 1.68 $ 3.33 $ 7.65 $ 9.18
Compensation costs related to non-vested RSU awards not yet recognized     $ 800    
Vesting period     7 months 6 days    
Trading price $ 2.45 $ 3.46      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     100.00%    
Mr. Ennen [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate grant-date fair value of stock awards   $ 8,000      
Compensation costs related to non-vested RSU awards not yet recognized     $ 5,700    
Vesting period     2 years 4 months 24 days    
Mr. Ennen [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, Granted   960,061      
Exercise price of stock option to purchase one common share   $ 3.36      
Trading price     $ 3.36    
Expected life (in years)     6 years 6 months    
Mr. Ennen [Member] | 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   1,785,714      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   892,857      
Trading price   $ 3.36 $ 3.36    
Expected life (in years)     1 year 9 months 18 days    
Mr. Ennen [Member] | 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, Grants in Period   892,857      
Mr. Ennen [Member] | 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   $ 80,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   297,619      
Mr. Ennen [Member] | 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   $ 110,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   297,619      
Mr. Ennen [Member] | 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   $ 140,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   297,619      
Mr. Ennen [Member] | 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]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   297,619      
Trading price   $ 5.00      
Mr. Ennen [Member] | 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]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   297,619      
Trading price   $ 9.00      
Mr. Ennen [Member] | 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]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   297,619      
Trading price   $ 14.00      
Mr. Ennen [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   512,619      
Trading price   $ 3.36      
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issued In Period   215,000      
Mr. Huckins [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate grant-date fair value of stock awards $ 1,700        
Compensation costs related to non-vested RSU awards not yet recognized     $ 1,500    
Vesting period     2 years 8 months 12 days    
Mr. Huckins [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, Granted 262,182        
Exercise price of stock option to purchase one common share $ 2.38        
Trading price     $ 2.38    
Expected life (in years)     6 years 6 months    
Mr. Huckins [Member] | 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 346,638        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 173,319        
Trading price     $ 2.38    
Expected life (in years)     2 years 1 month 6 days    
Mr. Huckins [Member] | 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, Grants in Period 173,319        
Mr. Huckins [Member] | 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 $ 80,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773        
Mr. Huckins [Member] | 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 $ 110,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773        
Mr. Huckins [Member] | 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 $ 140,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773        
Mr. Huckins [Member] | 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]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773        
Trading price $ 5.00        
Mr. Huckins [Member] | 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]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773        
Trading price $ 9.00        
Mr. Huckins [Member] | 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]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 57,773        
Trading price $ 14.00        
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 327,819        
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issued In Period 154,500        
2013 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of securities available for issuance under the Plan     3,876,211