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Stockholders' Equity and Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2015 | Jan. 02, 2016 | Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Aug. 01, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 100.0
Stock Repurchase Program, Period in Force | 24 months |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 94.1 |  |  |  |
Summary of stock option activity [Roll Forward] |  |  |  |  |  |
Options outstanding at the beginning of year |  | 696,176 | 906,251 | 722,617 |  |
Options outstanding at the beginning of year, Weighted-average exercise price per share |  | $ 13.88 | $ 9.97 | $ 8.07 |  |
Granted (in shares) |  | 422,386 | 163,078 | 195,634 |  |
Granted, Weighted-average exercise price per share |  | $ 14.76 | $ 19.94 | $ 16.53 |  |
Exercised (in shares) |  | (131,653) | (343,550) | (12,000) |  |
Exercised, Weighted-average exercise price per share |  | $ 4.13 | $ 6.18 | $ 2.67 |  |
Forfeited (in shares) |  | (136,177) | (29,603) | 0 |  |
Forfeited, Weighted-average exercise price per share |  | $ 16.68 | $ 16.89 | $ 0.00 |  |
Expired (in shares) |  | 0 | 0 | 0 |  |
Expired, Weighted average exercise price per share |  | $ 0.00 | $ 0.00 | $ 0.00 |  |
Options outstanding at the end of year |  | 850,732 | 696,176 | 906,251 | 722,617 |
Options outstanding at the end of year, Weighted-average exercise price per share |  | $ 15.38 | $ 13.88 | $ 9.97 | $ 8.07 |
Options outstanding, Weighted-average remaining contractual life (in years) |  | 7 years 8 months 12 days | 6 years 2 months 12 days | 5 years | 4 years 9 months 18 days |
Options exercisable (in shares) |  | 485,777 |  |  |  |
Options exercisable, Weighted-average exercise price per share |  | $ 15.22 |  |  |  |
Options exercisable, Weighted-average remaining contractual life (in years) |  | 6 years 8 months 12 days |  |  |  |
Fair value assumptions [Abstract] |  |  |  |  |  |
Expected dividend yield |  | 0.00% | 0.00% | 0.00% |  |
Risk-free interest rate |  | 1.82% | 1.77% | 1.01% |  |
Expected term |  | 5 years 9 months | 5 years 9 months | 5 years 9 months |  |
Expected volatility |  | 38.00% | 43.70% | 59.80% |  |
Fair value of options granted |  | $ 5.59 | $ 8.93 | $ 9.04 |  |
Nonqualified Stock Options Under Long Term Incentive Program [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Initial Cliff, Percent |  | 25.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Annual Vesting After Initial Cliff |  | 25.00% |  |  |  |
Director Restricted Stock Plan [Member] |  |  |  |  |  |
Summary of non-vested and restricted stock awards [Roll Forward] |  |  |  |  |  |
Stock awards outstanding at the beginning of year (in shares) |  | 155,916 | 130,238 | 108,458 |  |
Stock awards outstanding at the beginning of year, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 12.22 | $ 10.75 | $ 9.59 |  |
Shares granted |  | 46,910 | 25,678 | 21,780 |  |
Shares granted, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 13.80 | $ 19.67 | $ 16.53 |  |
Restricted shares where the restriction lapsed |  | (50,322) | 0 | 0 |  |
Restrictions Lapsed, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 12.25 | $ 0.00 | $ 0.00 |  |
Shares forfeited |  | 0 | 0 | 0 |  |
Shares forfeited, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 0.00 | $ 0.00 | $ 0.00 |  |
Stock awards outstanding at the end of year (in shares) |  | 152,504 | 155,916 | 130,238 | 108,458 |
Stock awards outstanding at the end of year, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 12.69 | $ 12.22 | $ 10.75 | $ 9.59 |
Stock Awards [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Initial Cliff, Percent |  | 25.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Annual Vesting After Initial Cliff |  | 25.00% |  |  |  |
Summary of non-vested and restricted stock awards [Roll Forward] |  |  |  |  |  |
Stock awards outstanding at the beginning of year (in shares) |  | 1,257,173 | 821,207 | 836,024 |  |
Stock awards outstanding at the beginning of year, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 19.98 | $ 14.93 | $ 12.26 |  |
Shares granted |  | 524,225 | 1,436,658 | 519,575 |  |
Shares granted, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 14.47 | $ 20.73 | $ 16.89 |  |
Shares vested |  | (714,626) | (861,772) | (527,725) |  |
Shares vested, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 17.91 | $ 16.43 | $ 12.73 |  |
Shares forfeited |  | (32,581) | (138,920) | (6,667) |  |
Shares forfeited, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 19.65 | $ 19.90 | $ 7.36 |  |
Stock awards outstanding at the end of year (in shares) |  | 1,034,191 | 1,257,173 | 821,207 | 836,024 |
Stock awards outstanding at the end of year, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 18.63 | $ 19.98 | $ 14.93 | $ 12.26 |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Restrictions Lapsed, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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