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Stock-Based Compensation (Narrative) (Details)			12 Months Ended
Stock-Based Compensation (Narrative) (Details)	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