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INTANGIBLE ASSETS AND GOODWILL (Intangible assets) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 29, 2019 | Dec. 30, 2018
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | $ 393,573,000 | $ 393,573,000
Write-downs and impairments | 0 |
Balance, end of period | 383,864,000 | 393,573,000
Carrying amount | 383,864,000 | 393,573,000
Gross carrying amount |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | 580,306,000 | 561,810,000
Additions | 14,224,000 | 19,465,000
Disposals | 206,000 | 969,000
Balance, end of period | 594,324,000 | 580,306,000
Carrying amount | 594,324,000 | 580,306,000
Accumulated amortization |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | (186,733,000) | (160,205,000)
Disposals | (18,000) | (811,000)
Amortization | 22,495,000 | 27,339,000
Write-downs and impairments | 1,250,000 |
Balance, end of period | (210,460,000) | (186,733,000)
Carrying amount | (210,460,000) | (186,733,000)
Customer contracts and customer relationships |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period |  | 135,425,000
Balance, end of period | 122,645,000 |
Carrying amount | 122,645,000 | 135,425,000
Customer contracts and customer relationships | Gross carrying amount |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | 224,489,000 | 224,489,000
Additions | 0 | 0
Disposals | 0 | 0
Balance, end of period | 224,489,000 | 224,489,000
Carrying amount | 224,489,000 | 224,489,000
Customer contracts and customer relationships | Accumulated amortization |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | (89,064,000) | (75,472,000)
Disposals | 0 | 0
Amortization | 12,780,000 | 13,592,000
Write-downs and impairments | 0 |
Balance, end of period | (101,844,000) | (89,064,000)
Carrying amount | (101,844,000) | (89,064,000)
License agreements |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period |  | 11,994,000
Balance, end of period | 11,335,000 |
Carrying amount | 11,335,000 | 11,994,000
License agreements | Gross carrying amount |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | 69,600,000 | 59,498,000
Additions | 3,150,000 | 10,102,000
Disposals | 0 | 0
Balance, end of period | 72,750,000 | 69,600,000
Carrying amount | 72,750,000 | 69,600,000
License agreements | Accumulated amortization |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | (57,606,000) | (49,034,000)
Disposals | 0 | 0
Amortization | 3,809,000 | 8,572,000
Write-downs and impairments | 0 |
Balance, end of period | (61,415,000) | (57,606,000)
Carrying amount | (61,415,000) | (57,606,000)
Computer software |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period |  | 21,790,000
Balance, end of period | 26,220,000 |
Carrying amount | 26,220,000 | 21,790,000
Computer software | Gross carrying amount |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | 58,255,000 | 49,771,000
Additions | 11,074,000 | 9,363,000
Disposals | 206,000 | 879,000
Balance, end of period | 69,123,000 | 58,255,000
Carrying amount | 69,123,000 | 58,255,000
Computer software | Accumulated amortization |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | (36,465,000) | (32,711,000)
Disposals | (18,000) | (721,000)
Amortization | 5,206,000 | 4,475,000
Write-downs and impairments | 1,250,000 |
Balance, end of period | (42,903,000) | (36,465,000)
Carrying amount | (42,903,000) | (36,465,000)
Non-compete agreements |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period |  | 0
Balance, end of period | 0 |
Carrying amount | 0 | 0
Non-compete agreements | Gross carrying amount |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | 1,790,000 | 1,880,000
Additions | 0 | 0
Disposals | 0 | 90,000
Balance, end of period | 1,790,000 | 1,790,000
Carrying amount | 1,790,000 | 1,790,000
Non-compete agreements | Accumulated amortization |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | (1,790,000) | (1,880,000)
Disposals | 0 | (90,000)
Amortization | 0 | 0
Write-downs and impairments | 0 |
Balance, end of period | (1,790,000) | (1,790,000)
Carrying amount | (1,790,000) | (1,790,000)
Trademarks |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period |  | 224,364,000
Balance, end of period | 223,664,000 |
Carrying amount | 223,664,000 | 224,364,000
Trademarks | Gross carrying amount |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | 226,172,000 | 226,172,000
Additions | 0 | 0
Disposals | 0 | 0
Balance, end of period | 226,172,000 | 226,172,000
Carrying amount | 226,172,000 | 226,172,000
Trademarks | Accumulated amortization |  |
Changes in intangible assets other than goodwill [abstract] |  |
Balance, beginning of period | (1,808,000) | (1,108,000)
Disposals | 0 | 0
Amortization | 700,000 | 700,000
Write-downs and impairments | 0 |
Balance, end of period | (2,508,000) | (1,808,000)
Carrying amount | $ (2,508,000) | $ (1,808,000)

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