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SHAREHOLDERS’ EQUITY (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 27, 2019 shares | Mar. 28, 2008 shares | Mar. 01, 2008 shares | Jun. 30, 2006 shares | Jan. 02, 2009 shares | Jun. 27, 2008 shares | Dec. 27, 2019 USD ($) plan shares | Dec. 28, 2018 USD ($) shares | Dec. 29, 2017 USD ($) shares | Dec. 30, 2016 shares | Jan. 01, 2016 shares | Dec. 28, 2012 shares | Dec. 31, 2010 shares | Jun. 30, 2008 shares | Mar. 31, 2008 shares
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share-based compensation plans | plan |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
2006 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance | 418,000 |  |  |  |  |  | 418,000 |  |  |  |  |  |  |  | 450,000
Shares available for grant under 2008 Plan from 2006 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,333 |
Number of additional shares authorized |  |  |  |  |  |  | 955,000 |  | 875,000 | 500,000 |  | 500,000 | 350,000 |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense recognized | $ |  |  |  |  |  |  | $ 12,112,000 |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 158,000 | 199,000 |  |  |  |  |  |
Options outstanding (in shares) | 1,124,000 |  |  |  |  |  | 1,124,000 | 1,252,000 | 1,207,000 | 1,311,000 |  |  |  |  |
Stock options | 2006 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding (in shares) | 0 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Stock options | 2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares a participant may be granted in options to purchase during fiscal year |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |
Incentive stock options | 2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding options granted, net of forfeitures, expirations and exercises (in shares) |  | 509,000 | 509,000 |  | 509,000 | 509,000 | 509,000 | 509,000 | 509,000 | 509,000 | 509,000 | 509,000 | 509,000 |  |
Non-statutory/Nonqualified stock options | 2006 Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period from date of grant |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Non-statutory/Nonqualified stock options | 2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding options granted, net of forfeitures, expirations and exercises (in shares) | 598,000 |  | 598,000 |  |  |  |  |  |  |  |  |  |  |  |
Non-statutory/Nonqualified stock options | 2008 Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period from date of grant |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  | $ 6,262,000 |  |  |  |  |  |  |
Restricted stock | 2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted | 101,000 |  | 101,000 |  |  |  |  |  |  |  |  |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  |  | $ 2,774,000 |  |  |  |  |  |
Performance Shares | 2008 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted | 326,000 |  | 326,000 |  |  |  |  |  |  |  |  |  |  |  |

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