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Stock-Based Compensation (Narrative) (Details) |  |  | 12 Months Ended
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Sep. 03, 2019 USD ($) $ / shares shares | Apr. 01, 2019 USD ($) $ / shares shares | Jan. 01, 2022 USD ($) $ / shares $ / shares shares | Jan. 01, 2022 USD ($) $ / shares shares | Jan. 02, 2021 USD ($) $ / shares shares | Dec. 28, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reversal of previously recognized stock-based compensation expense related to forfeited awards | $ |  |  |  |  | $ 900,000 | $ 4,100,000
Intrinsic value of stock options exercised | $ |  |  |  | $ 5,100,000 |  |
Employee share purchase plan | $ |  |  |  | $ 583,000 | $ 462,000 | $ 475,000
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  |  | 142,499 |  |
Exercise price of stock option to purchase one common share | $ / shares |  |  |  | $ 14.77 |  |
Weighted-average grant-date fair value of options | $ / shares |  |  |  | $ 8.10 | $ 2.52 | $ 1.70
Compensation costs related to awards not yet recognized | $ |  |  | $ 1,300,000 | $ 1,300,000 |  |
Vesting period | 3 years |  |  | 2 years |  |
Expiration period | 10 years |  |  |  |  |
Trading price | $ / shares |  |  | $ 14.77 | $ 14.77 | $ 4.64 | $ 3.57
Expected life (in years) |  |  |  | 6 years | 6 years | 5 years 9 months 18 days
Employee share purchase plan | $ |  |  |  | $ 600,000 | $ 500,000 | $ 500,000
Employee stock purchase plan (in shares) |  |  |  | 66,834 | 113,581 | 185,415
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding |  |  | 634,082 | 634,082 |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  |  | 666,332 |  |
Weighted-average grant-date fair value of options | $ / shares | $ 0.79 | $ 1.77 |  | $ 13.90 | $ 3.54 | $ 3.42
Compensation costs related to awards not yet recognized | $ |  |  | $ 400,000 | $ 400,000 |  |
Vesting period |  |  |  | 1 year 6 months |  |
Compensation expense not recognized | $ |  |  | 9,000,000 | $ 9,000,000 |  |
Intrinsic value | $ |  |  | 37,300,000 | $ 37,300,000 |  |
Trading price | $ / shares | 2.38 | 3.36 |  |  |  |
Performance Shares [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of vesting PSU's |  |  |  | 0.00% |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of vesting PSU's |  |  |  | 200.00% |  |
Restricted stock units ("RSUs") [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  |  | 245,848 |  |
Weighted-average grant-date fair value of options | $ / shares | 1.18 | 1.68 |  | $ 13.32 | $ 3.20 | $ 3.33
Compensation costs related to awards not yet recognized | $ |  |  | 2,600,000 | $ 2,600,000 |  |
Vesting period |  |  |  | 2 years |  |
Intrinsic value | $ |  |  | $ 3,800,000 | $ 3,800,000 |  |
Trading price | $ / shares | $ 2.45 | $ 3.46 |  |  |  |
Percentage of vesting PSU's |  |  |  | 100.00% |  |
Total Shareholder Return Performance Shares "(TSR PSU") [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  |  | 74,428 |  |
Weighted-average grant-date fair value of options | $ / shares |  |  | $ 23.40 |  |  |
Vesting period |  |  |  | 2 years 3 months 18 days |  |
Intrinsic value | $ |  |  | $ 1,300,000 | $ 1,300,000 |  |
CEO [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate grant-date fair value of stock awards | $ |  |  | 8,000,000.0 | 8,000,000.0 |  |
Compensation costs related to awards not yet recognized | $ |  |  | $ 1,100,000 | $ 1,100,000 |  |
Vesting period |  |  |  | 9 months 18 days |  |
CEO [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 | $ / shares |  | $ 3.36 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  | 0 |  |
Trading price | $ / shares |  |  | $ 3.36 | $ 3.36 |  |
Expected life (in years) |  |  |  | 6 years 6 months |  |
CEO [Member] | Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of consecutive trading days |  | 20 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 1,785,714 |  |  |  |
Intrinsic value | $ |  |  | $ 11,500,000 | $ 11,500,000 |  |
Trading price | $ / shares |  |  | $ 3.36 | $ 3.36 |  |
Expected life (in years) |  |  |  | 1 year 9 months 18 days |  |
CEO [Member] | Performance Shares [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 |  |  |  |
CEO [Member] | Performance Shares [Member] | Vest upon the Company achieving annual adjusted EBITDA of $43 million |  |  |  |  |  |
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 |  |  |  |
Original EBITDA threshold | $ |  | $ 43,000,000 |  |  |  |
CEO [Member] | Performance Shares [Member] | Vest upon the Company achieving annual adjusted EBITDA of $65 million |  |  |  |  |  |
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 |  |  |  |
Original EBITDA threshold | $ |  | $ 65,000,000 |  |  |  |
CEO [Member] | Performance Shares [Member] | Vest upon the Company achieving annual adjusted EBITDA of $87 million |  |  |  |  |  |
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 |  |  |  |
Original EBITDA threshold | $ |  | $ 87,000,000 |  |  |  |
CEO [Member] | Performance Shares [Member] | Vest upon Common Shares achieving certain volume-weighted average trading prices [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 |  |  |  |
CEO [Member] | Performance Shares [Member] | Vest upon achieving a trading price of $5.00 per share [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of consecutive trading days |  | 20 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | 297,619 |  |  |  |
Trading price | $ / shares |  | $ 5.00 |  |  |  |
CEO [Member] | Performance Shares [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 | $ / shares |  | $ 9.00 |  |  |  |
CEO [Member] | Performance Shares [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 | $ / shares |  | $ 14.00 |  |  |  |
CEO [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 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  | 170,873 |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issued In Period |  | 215,000 |  |  |  |
CFO [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate grant-date fair value of stock awards | $ |  |  | $ 2,100,000 | $ 2,100,000 |  |
Compensation costs related to awards not yet recognized | $ |  |  | $ 700,000 | $ 700,000 |  |
Vesting period |  |  |  | 1 year 4 months 24 days |  |
CFO [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 | $ / shares | $ 2.38 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  | 0 |  |
Trading price | $ / shares |  |  | $ 2.38 | $ 2.38 |  |
Expected life (in years) |  |  |  | 6 years 6 months |  |
CFO [Member] | Performance Shares [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 |  |  |  |  |
Intrinsic value | $ |  |  | $ 2,800,000 | $ 2,800,000 |  |
Trading price | $ / shares |  |  | $ 2.38 | $ 2.38 |  |
Expected life (in years) |  |  |  | 2 years 1 month 6 days |  |
CFO [Member] | Performance Shares [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 |  |  |  |  |
CFO [Member] | Performance Shares [Member] | Vest upon the Company achieving annual adjusted EBITDA of $43 million |  |  |  |  |  |
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 |  |  |  |  |
Original EBITDA threshold | $ | $ 43,000,000 |  |  |  |  |
CFO [Member] | Performance Shares [Member] | Vest upon the Company achieving annual adjusted EBITDA of $65 million |  |  |  |  |  |
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 |  |  |  |  |
Original EBITDA threshold | $ | $ 65,000,000 |  |  |  |  |
CFO [Member] | Performance Shares [Member] | Vest upon the Company achieving annual adjusted EBITDA of $87 million |  |  |  |  |  |
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 |  |  |  |  |
Original EBITDA threshold | $ | $ 87,000,000 |  |  |  |  |
CFO [Member] | Performance Shares [Member] | Vest upon achieving a trading price of $5.00 per share [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of consecutive trading days | 20 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 57,773 |  |  |  |  |
Trading price | $ / shares | $ 5.00 |  |  |  |  |
CFO [Member] | Performance Shares [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 | $ / shares | $ 9.00 |  |  |  |  |
CFO [Member] | Performance Shares [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 | $ / shares | $ 14.00 |  |  |  |  |
CFO [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 |  |  | 29,090 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  |  | 109,273 |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issued In Period | 154,500 |  |  |  |  |
Grant-date fair value of additional RSUs | $ |  |  |  | $ 15.49 |  |
2013 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of securities issuance under the Plan |  |  | 4,373,448 | 4,373,448 |  |
2021 Long-Term Incentive Plan [Member] | Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average grant-date fair value of options | $ / shares |  |  |  | $ 23.40 |  |

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