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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | The following table summarizes stock option activity for the year ended December 29, 2018:
|  |  |  |  |  |  | Weighted- |  |
|  |  |  |  |  |  | average |  |
|  |  |  |  | Weighted- | remaining |  |
|  |  |  |  | average | contractual | Aggregate
|  |  |  | Stock options | exercise price | term (years) | intrinsic value
Outstanding, beginning of year | 3,306,728 | $ | 7.51 |  |  |
Granted | 58,000 |  | 7.56 |  |  |
Exercised | (222,880) |  | 4.11 |  |  |
Forfeited | (443,298) |  | 7.76 |  |  |
Outstanding, end of year | 2,698,550 | $ | 7.76 | 6.67 | $ | 210
Exercisable, end of year | 1,264,902 | $ | 7.18 | 5.04 | $ | 127
The following table summarizes non-vested stock option activity during the year ended December 29, 2018:
|  |  |  |  | Weighted-
|  |  |  |  | average grant-
|  |  |  | Stock options | date fair value
Non-vested, beginning of year | 2,149,221 | $ | 3.57
Granted | 58,000 |  | 3.31
Vested | (524,657) |  | 3.19
Forfeited | (248,916) |  | 3.22
Non-vested, end of year | 1,433,648 | $ | 3.74
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block] | The following table summarizes non-vested stock option activity during the year ended December 29, 2018:
|  |  |  |  |  | Weighted- |  |  |  |  |
|  |  |  |  |  | average |  |  |  |  |
|  |  | remaining | Weighted- |  | Weighted-
Exercise price range | Outstanding | contractual life | average exercise | Exercisable | average exercise
| Low |  |  | High | options | (years) | price | options | price
$ | 3.27 |  | $ | 5.50 | 468,550 | 6.85 | $ | 3.68 | 297,447 | $ | 3.75
| 5.51 |  |  | 7.28 | 527,377 | 5.76 |  | 6.24 | 302,043 |  | 5.91
| 7.29 |  |  | 9.35 | 578,999 | 6.48 |  | 8.03 | 333,502 |  | 7.67
| 9.36 |  |  | 9.60 | 687,445 | 8.40 |  | 9.50 | 1,667 |  | 9.45
| 9.61 |  |  | 13.86 | 436,179 | 5.14 |  | 10.85 | 330,243 |  | 10.92
|  |  |  |  | 2,698,550 | 6.67 | $ | 7.76 | 1,264,902 | $ | 7.18
Schedule Of Share Based Compensation - RSU [Table Text Block] | The following table summarizes non-vested RSU activity during the year ended December 29, 2018:
|  |  |  |  | Weighted-
|  |  |  |  | average grant-
|  |  |  | RSUs | date fair value
Non-vested, beginning of year | 775,356 | $ | 8.85
Granted | 154,711 |  | 7.65
Vested | (314,326) |  | 8.96
Forfeited | (17,904) |  | 9.50
Non-vested, end of year | 597,837 | $ | 8.46
Schedule Of Share Based Compensation - PSU [Table Text Block] | The following table summarizes non-vested PSU activity during the year ended December 29, 2018:
|  |  |  |  | Weighted-
|  |  |  |  | average grant-
|  |  |  | PSUs | date fair value
Non-vested, beginning of year | 1,519,752 | $ | 5.68
Forfeited or cancelled | (157,856) |  | 6.41
Non-vested, end of year | 1,361,896 | $ | 5.60
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The weighted-average grant-date fair values of all stock options granted in the years ended December 29, 2018, December 30, 2017 and December 31, 2016, were $3.31, $4.12 and $1.86, respectively. The weighted-average assumptions used in the Black-Scholes option pricing model to determine the fair value of the stock options granted in those years were as follows:
|  |  |  | December 29, 2018 | December 30, 2017 | December 31, 2016
Grant-date stock price | $ | 7.56 | $ | 9.29 | $ | 4.25
Dividend yield(1) |  | 0% |  | 0% |  | 0%
Expected volatility(2) |  | 41.1% |  | 42.1% |  | 41.7%
Risk-free interest rate(3) |  | 2.9% |  | 2.0% |  | 1.6%
Expected life of options (years)(4) |  | 6.0 |  | 6.4 |  | 6.0
(1) Determined based on expected annual dividend yield at the time of grant. (2) Determined based on historical volatility of the Company’s C ommon S hares over the expected life of the option. (3) Determined based on the yield on U.S. Treasury zero-coupon issues with maturity dates equal to the expected life of the option. (4) Determined using simplified method, as the Company changed the vesting period of its stock option grants from five years to three years in 2016, and, as a result, historical exercise data may not provide a reasonable basis upon which to estimate expected life. The grant-date weighted-average fair value of the PSUs was determined to be $5.64, based on the following inputs to the valuation model:
|  |  |  |  |  |  |  | December 30, 2017
Grant-date stock price |  |  |  |  | $ | 9.33
Dividend yield |  |  |  |  |  | 0%
Expected volatility(1) |  |  |  |  |  | 42.2%
Risk-free interest rate(2) |  |  |  |  |  | 1.5%
Expected life (in years)(3) |  |  |  |  |  | 3.0
(1) Determined based on the historical volatility of the Common Shares over 6.5 years, which is consistent with the volatility assumption for stock options granted to employees. (2) Determined based on U.S. Treasury yields with a remaining term equal to the expected li fe of the PSUs. (3) Determined based on vesting for the PSUs.
Schedule Of Share Based Payment Award Employee Stock Purchase Plan Valuation Assumptions Table [Text Block] | For the year ended December 29, 2018, t he grant-date weighted-average fair values of the Special Stock Options and PSUs were esti mated using a Monte Carlo valuation model and determined to be $1.84 and $2.79, respectively, based on the following i nputs to the valuation model:
|  |  |  | December 30, 2017
|  |  |  |  | Special Stock |  |
|  |  |  |  | Options |  | PSUs
Grant-date stock price | $ | 7.00 | $ | 7.00
Exercise price | $ | 7.00 |  | NA
Dividend yield |  | 0% |  | 0%
Expected volatility(1) |  | 42.0% |  | 42.0%
Risk-free interest rate(2) |  | 2.2% |  | 1.5%
Expected life (in years)(3) |  | 6.5 |  | 3.0
(1) Determined based on the historical volatility of the Common Shares over the expected life of the Special Stock Options. (2) Determined based on U.S. Treasury yields with a remaining term equal to the respective expected lives of the Special Stock Options and PSUs. (3) Determined using the simplified method for the Special Stock Options, based on the mid-point of vesting (three years) and expiration (ten years). Determined based on vesting for the PSUs.

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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