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SHAREHOLDERS' EQUITY - General Information (Details) - shares | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2006 | Dec. 30, 2022 | Dec. 27, 2019 | Dec. 29, 2017 | Dec. 30, 2016 | Dec. 28, 2012 | Dec. 31, 2010 | Dec. 31, 2021 | Jan. 01, 2021 | Jun. 30, 2008 | Mar. 31, 2008 | Dec. 28, 2007
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Options, granted (in shares) |  | 0 |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  | 816,000 | 1,124,000 |  |  |  |  | 849,000 | 1,003,000 |  |  |
2006 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (in shares) | 300,000 |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  | 0 |  |  |  |  |  |  |  |  |  |
2008 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Extension period |  | 3 years | 10 years |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (in shares) |  | 392,000 |  |  |  |  |  |  |  |  | 450,000 |
Number of shares available for grant (in shares) |  |  |  |  |  |  |  |  |  | 182,735 |  |
Number of additional shares authorized (in shares) |  | 478,000 | 955,000 | 875,000 | 500,000 | 500,000 | 350,000 |  |  |  |  |
Share-Based Payment Arrangement, Option | 2008 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares a participant may be granted in options to purchase during fiscal year |  | 300,000 |  |  |  |  |  |  |  |  |  |
Incentive Stock Options | 2008 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  | 40,000 |  |  |  |  |  |  |  |  |  |
Non Statutory Stock Options | 2006 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Expiration period from date of grant | 10 years |  |  |  |  |  |  |  |  |  |  |
Non Statutory Stock Options | 2008 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Expiration period from date of grant |  | 10 years |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) |  | 776,000 |  |  |  |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Other than options, outstanding (in shares) |  | 135,000 | 58,000 |  |  |  |  | 110,000 | 128,000 |  |  |
Restricted Stock | 2008 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Other than options, outstanding (in shares) |  | 135,000 |  |  |  |  |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Other than options, outstanding (in shares) |  | 66,000 | 431,000 |  |  |  |  | 224,000 | 379,000 |  |  |
Performance Shares | 2008 Performance Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Other than options, outstanding (in shares) |  | 66,000 |  |  |  |  |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (in shares) |  | 1,125,000 |  |  |  |  |  |  |  |  |  | 300,000
Number of shares available for grant (in shares) |  | 364,000 |  |  |  |  |  |  |  |  |  |
Purchase price per share as a percentage of fair market value |  | 85.00% |  |  |  |  |  |  |  |  |  |
Number of additional shares authorized (in shares) |  |  |  | 825,000 |  |  |  |  |  |  |  |
Employee Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Percentage of participant's earnings to be contributed under a share based compensation plan |  | 1.00% |  |  |  |  |  |  |  |  |  |
Employee Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Percentage of participant's earnings to be contributed under a share based compensation plan |  | 10.00% |  |  |  |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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