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Share-Based Compensation - Restricted Shares and Other (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Jan. 01, 2022 USD ($) installment $ / shares shares | Jan. 02, 2021 USD ($) $ / shares shares | Dec. 28, 2019 USD ($) shares
2006 Incentive Plan |  |  |
Additional disclosures |  |  |
Shares available for grant | 339,796 |  |
Options |  |  |
Additional disclosures |  |  |
Fair value of options vested | $ | $ 0.2 | $ 0.2 | $ 0.7
Unrecognized compensation cost, net of expected forfeitures | $ | $ 0.1 |  |
Weighted-average period over which cost is expected to be recognized | 10 months 24 days |  |
Restricted stock |  |  |
Additional disclosures |  |  |
Number of vesting installments | installment | 4 |  |
Unrecognized compensation cost, net of expected forfeitures | $ | $ 1.3 |  |
Weighted-average period over which cost is expected to be recognized | 3 years |  |
Forfeiture rate (as a percent) | 0.90% |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Fair value of restricted shares vested | $ | $ 0.5 | $ 0.5 | 0.5
Restricted stock | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 33,540 |  |
Granted (in shares) | 10,491 |  |
Vested (in shares) | (13,248) |  |
Forfeited (in shares) | 0 |  |
Balance at the end of the period (in shares) | 30,783 | 33,540 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 38.73 |  |
Granted (in dollars per share) | $ / shares | 85.78 |  |
Vested (in dollars per share) | $ / shares | 39.16 |  |
Forfeited (in dollars per share) | $ / shares | 0 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 54.58 | $ 38.73 |
Time-Vesting RSUs |  |  |
Additional disclosures |  |  |
Unrecognized compensation cost, net of expected forfeitures | $ | $ 3.4 |  |
Weighted-average period over which cost is expected to be recognized | 2 years 10 months 24 days |  |
Forfeiture rate (as a percent) | 0.90% |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Fair value of restricted shares vested | $ | $ 1.3 | $ 1.0 | $ 1.3
Time-Vesting RSUs | Minimum |  |  |
Additional disclosures |  |  |
Number of vesting installments | installment | 4 |  |
Time-Vesting RSUs | Maximum |  |  |
Additional disclosures |  |  |
Number of vesting installments | installment | 5 |  |
Time-Vesting RSUs | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 84,989 |  |
Granted (in shares) | 26,563 |  |
Vested (in shares) | (29,171) |  |
Forfeited (in shares) | 0 |  |
Balance at the end of the period (in shares) | 82,381 | 84,989 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 45.93 |  |
Granted (in dollars per share) | $ / shares | 61.90 |  |
Vested (in dollars per share) | $ / shares | 44.79 |  |
Forfeited (in dollars per share) | $ / shares | 0 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 51.48 | $ 45.93 |
PRSU |  |  |
Additional disclosures |  |  |
Vesting period (in years) | 2 years |  |
PRSU | Vesting on the fourth anniversary of date of grant |  |  |
Additional disclosures |  |  |
Vesting percentage | 25.00% |  |
PRSU | Vesting in the first year following performance period |  |  |
Additional disclosures |  |  |
Vesting percentage | 75.00% |  |
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) | 90,580 |  |
Granted (in shares) | 25,924 |  |
Vested (in shares) | (22,823) |  |
Forfeited (in shares) | (300) |  |
Balance at the end of the period (in shares) | 93,381 | 90,580 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 50.06 |  |
Granted (in dollars per share) | $ / shares | 68.71 |  |
Vested (in dollars per share) | $ / shares | 44.72 |  |
Forfeited (in dollars per share) | $ / shares | 47.45 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 56.55 | $ 50.06 |
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 |  |
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 Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://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 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://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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