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EQUITY AND NONCONTROLLING INTERESTS - Rollforward of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Aug. 28, 2019 | Jun. 13, 2019 | Apr. 29, 2019
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Beginning balance | $ 28,647 | $ 18,525 |  |  |
Adjustment to Vital River redemption value | 0 | 1,451 |  |  |
Purchase of Vital River 5% equity interest | (2,379) | (1,870) |  |  |
Acquisition of non-controlling interest | (3,732) | 0 |  |  |
Net loss attributable to noncontrolling interests | (852) | (42) |  |  |
Foreign currency translation | 1,436 | (221) |  |  |
Ending balance | 25,499 | 28,647 |  |  |
Supplier |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Acquisition of non-controlling interest | 0 | 8,740 |  |  |
Non-controlling interest percentage acquired |  |  | 20.00% |  | 20.00%
Vital River |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Purchase of Vital River 5% equity interest | 0 | (8,745) |  |  |
Change in fair value of Vital River 8% equity interest, included in additional paid-in capital | 0 | 2,708 |  |  |
Modification of Vital River 8% purchase option | 0 | 2,196 |  |  |
Additional equity interest percentage purchased |  |  |  | 5.00% |
Non-controlling interest percentage acquired |  |  |  | 8.00% |
Citoxlab |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Acquisition of non-controlling interest | $ 0 | $ 4,035 |  |  |
Non-controlling interest percentage acquired |  | 10.00% |  |  | 10.00%

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