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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)