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Share-Based Compensation - Restricted Shares and Other (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 29, 2018 USD ($) item $ / shares shares | Dec. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares
2006 Incentive Plan |  |  |
Additional disclosures |  |  |
Shares available for grant | 747,926 |  |
Options |  |  |
Additional disclosures |  |  |
Fair value of options vested | $ | $ 1.1 | $ 1.5 | $ 1.5
Unrecognized compensation cost, net of expected forfeitures | $ | $ 1.1 |  |
Weighted-average period over which cost is expected to be recognized | 2 years 6 months |  |
Forfeiture rate (as a percent) | 0.40% | 0.40% | 0.50%
Restricted stock |  |  |
Additional disclosures |  |  |
Number of vesting installments | item | 4 |  |
Unrecognized compensation cost, net of expected forfeitures | $ | $ 0.9 |  |
Weighted-average period over which cost is expected to be recognized | 2 years 8 months 12 days |  |
Forfeiture rate (as a percent) | 0.90% |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Fair value of restricted shares vested | $ | $ 0.6 | $ 0.6 | $ 0.6
Restricted stock | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 52,725 |  |
Granted (in shares) | 8,256 |  |
Vested (in shares) | (24,975) |  |
Balance at the end of the period (in shares) | 36,006 | 52,725 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 27.97 |  |
Granted (in dollars per share) | $ / shares | 54.50 |  |
Vested (in dollars per share) | $ / shares | 26.02 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 35.41 | $ 27.97 |
Time-Vesting RSUs |  |  |
Additional disclosures |  |  |
Number of vesting installments | item | 4 |  |
Unrecognized compensation cost, net of expected forfeitures | $ | $ 2.3 |  |
Weighted-average period over which cost is expected to be recognized | 2 years 6 months |  |
Forfeiture rate (as a percent) | 0.90% |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Fair value of restricted shares vested | $ | $ 1.7 | $ 2.0 | $ 1.9
Time-Vesting RSUs | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 119,820 |  |
Granted (in shares) | 21,901 |  |
Vested (in shares) | (61,258) |  |
Forfeited (in shares) | (704) |  |
Balance at the end of the period (in shares) | 79,759 | 119,820 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 27.90 |  |
Granted (in dollars per share) | $ / shares | 46.90 |  |
Vested (in dollars per share) | $ / shares | 27.18 |  |
Forfeited (in dollars per share) | $ / shares | 32.53 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 33.64 | $ 27.90 |
PRSU |  |  |
Additional disclosures |  |  |
Vesting period | 2 years |  |
PRSU | Vesting in the first year following performance period |  |  |
Additional disclosures |  |  |
Vesting percentage | 75.00% |  |
PRSU | Vesting on the fourth anniversary of date of grant |  |  |
Additional disclosures |  |  |
Vesting percentage | 25.00% |  |
PRSU | Minimum |  |  |
Additional disclosures |  |  |
PRSUs performance measure (as a percent) | 50.00% |  |
PRSU | Maximum |  |  |
Additional disclosures |  |  |
PRSUs performance measure (as a percent) | 125.00% |  |
PRSU | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 280,595 |  |
Granted (in shares) | 18,701 |  |
Vested (in shares) | (151,276) |  |
Forfeited (in shares) | (26,070) |  |
Balance at the end of the period (in shares) | 121,950 | 280,595 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 25.51 |  |
Granted (in dollars per share) | $ / shares | 47.45 |  |
Vested (in dollars per share) | $ / shares | 22.89 |  |
Forfeited (in dollars per share) | $ / shares | 21.78 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 32.92 | $ 25.51 |
Additional disclosures |  |  |
Achievement percentage (as a percent) | 125.00% |  |
1998 Employee Stock Purchase Plan (ESPP) |  |  |
Additional disclosures |  |  |
Number of shares authorized | 243,000 |  |
Purchase price as a percentage of fair market value (as a percent) | 85.00% |  |
Offering period under the plan (in years) | 1 year |  |
Offering period (in years) | 0 years | 0 years | 0 years
Shares issued | 0 | 0 | 0
Shares available for grant | 211,777 |  |

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- Definition The performance achievement percentage 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 No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&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=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=96867065&loc=d3e5070-113901 + Details
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