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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 03, 2019 | Apr. 01, 2019 | Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018 | Feb. 11, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Gross stock-based compensation expense |  |  | $ 13,100 | $ 11,600 | $ 7,900 |
Reversal of previously recognized stock-based compensation expense related to forfeited awards |  |  | 900 | 4,100 |  |
Intrinsic value of stock options exercised |  |  | 300 |  |  |
Employee stock purchase plan |  |  | $ 462 | $ 475 | $ 630 |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  | 555,092 |  |  |
Exercise price of stock option to purchase one common share |  |  | $ 4.64 |  |  |
Weighted-average grant-date fair value of options |  |  | $ 2.52 | $ 1.70 | $ 3.31 |
Compensation costs related to awards not yet recognized |  |  | $ 1,100 |  |  |
Vesting period | 3 years | 3 years | 2 years 4 months 24 days |  |  |
Expiration period | 10 years | 10 years |  |  |  |
Trading price |  |  | $ 4.64 | $ 3.57 | $ 7.56 |
Expected life (in years) |  |  | 6 years | 5 years 9 months 18 days | 6 years |
Employee stock purchase plan |  |  | $ 500 | $ 500 | $ 600 |
Employee stock purchase plan (in shares) |  |  | 113,581 | 185,415 | 112,158 |
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding |  |  | 700,916 |  |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  | 3,084,107 |  |  |
Weighted-average grant-date fair value of options | $ 0.79 |  | $ 3.54 | $ 3.42 |  |
Weighted-average grant-date fair value of equity instruments other than options |  | $ 1.77 |  |  |  |
Compensation costs related to awards not yet recognized |  |  | $ 4,400 |  |  |
Vesting period |  |  | 9 months 18 days |  |  |
Intrinsic value |  |  | $ 2,100 |  |  |
Trading price | 2.38 | 3.36 |  |  |  |
Restricted stock units ("RSUs") [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  | 647,565 |  |  |
Weighted-average grant-date fair value of options | 1.18 | 1.68 | $ 3.20 | $ 3.33 | $ 7.65 |
Compensation costs related to awards not yet recognized |  |  | $ 1,400 |  |  |
Vesting period |  |  | 1 year 10 months 24 days |  |  |
Intrinsic value |  |  | $ 1,600 |  |  |
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 awards not yet recognized |  |  | $ 3,100 |  |  |
Vesting period |  |  | 1 year 7 months 6 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 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  | 0 |  |  |
Trading price |  |  | $ 3.36 |  |  |
Expected life (in years) |  |  | 6 years 6 months |  |  |
Mr. Ennen [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 |  | 1,785,714 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | 892,857 |  |  |  |
Intrinsic value |  |  | $ 5,200 |  |  | $ 4,900
Trading price |  |  | $ 3.36 |  |  |
Expected life (in years) |  |  | 1 year 9 months 18 days |  |  |
Mr. Ennen [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 |  |  |  |
Mr. Ennen [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 |  | $ 80,000 |  |  |  |
Adjusted EBITDA threshold |  | $ 43,000 |  |  |  |
Mr. Ennen [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 |  | $ 110,000 |  |  |  |
Adjusted EBITDA threshold |  | $ 65,000 |  |  |  |
Mr. Ennen [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 |  | $ 140,000 |  |  |  |
Adjusted EBITDA threshold |  | $ 87,000 |  |  |  |
Mr. Ennen [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 |  | $ 5.00 |  |  |  |
Mr. Ennen [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 |  | $ 9.00 |  |  |  |
Mr. Ennen [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 |  | $ 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 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  | 170,873,000 |  |  |
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 awards not yet recognized |  |  | $ 900 |  |  |
Vesting period |  |  | 1 year 9 months 18 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 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  |  | 0 |  |  |
Trading price |  |  | $ 2.38 |  |  |
Expected life (in years) |  |  | 6 years 6 months |  |  |
Mr. Huckins [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 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 173,319 |  |  |  |  |
Intrinsic value |  |  | $ 1,700 |  |  | $ 1,000
Trading price |  |  | $ 2.38 |  |  |
Expected life (in years) |  |  | 2 years 1 month 6 days |  |  |
Mr. Huckins [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 |  |  |  |  |
Mr. Huckins [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 | $ 80,000 |  |  |  |  |
Adjusted EBITDA threshold | $ 43,000 |  |  |  |  |
Mr. Huckins [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 | $ 110,000 |  |  |  |  |
Adjusted EBITDA threshold | $ 65,000 |  |  |  |  |
Mr. Huckins [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 | $ 140,000 |  |  |  |  |
Adjusted EBITDA threshold | $ 87,000 |  |  |  |  |
Mr. Huckins [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 | $ 5.00 |  |  |  |  |
Mr. Huckins [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 | $ 9.00 |  |  |  |  |
Mr. Huckins [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 | $ 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, Vested in Period |  |  | 109,273,000 |  |  |
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 |  |  | 4,987,863 |  |  |
2019 Short-Term Incentive Plan [Member] | Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares issued |  |  | 773,875 |  |  |
Shares withheld for tax withholding obligation |  |  | 368,938 |  |  |
2020 Short-Term Incentive Plan [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 |  |  | 2,751,251 |  |  |
Aggregate grant-date fair value |  |  | $ 9,400 |  |  |
Long-Term Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate grant-date fair value |  |  | $ 3,200 |  |  |
Long-Term Incentive Plan [Member] | Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, Granted |  |  | 484,944 |  |  |
Long-Term Incentive Plan [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 |  |  | 253,424 |  |  |
Long-Term Incentive Plan [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 |  |  | 129,017 |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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