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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
--- | --- | --- | ---
Inventory, Net [Abstract] |  |  |
Raw materials and purchased parts | $ 153,708 | $ 158,314 |
Work-in-process | 25,335 | 38,088 |
Finished goods and manufactured goods | 269,045 | 221,968 |
Total | 448,088 | 418,370 |
Retained earnings | $ 2,219,182 | 2,173,802 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
Inventory, Net [Abstract] |  |  |
Retained earnings |  | $ 32,854 | $ 40,215

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