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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 |  |

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