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INTANGIBLE ASSETS AND GOODWILL (Intangible assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period $ 401,605 $ 401,605
Balance, end of period 393,573 401,605
Carrying amount 401,605 401,605
Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 561,810 490,457
Additions 19,465 2,852
Additions through business acquisitions   70,358
Balance, end of period 580,306 561,810
Carrying amount 561,810 490,457
Disposals, intangible assets other than goodwill 969 1,857
Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (160,205) (136,236)
Amortization 27,339 25,594
Balance, end of period (186,733) (160,205)
Carrying amount (160,205) (136,236)
Disposals, intangible assets other than goodwill (811) (1,625)
Customer contracts and customer relationships    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   149,017
Balance, end of period 135,425  
Carrying amount 135,425 149,017
Customer contracts and customer relationships | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 224,489 205,531
Additions 0 0
Additions through business acquisitions   18,958
Balance, end of period 224,489 224,489
Carrying amount 224,489 205,531
Disposals, intangible assets other than goodwill 0 0
Customer contracts and customer relationships | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (75,472) (62,185)
Amortization 13,592 13,287
Balance, end of period (89,064) (75,472)
Carrying amount (75,472) (62,185)
Disposals, intangible assets other than goodwill 0 0
License agreements    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   10,464
Balance, end of period 11,994  
Carrying amount 11,994 10,464
License agreements | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 59,498 59,498
Additions 10,102 0
Additions through business acquisitions   0
Balance, end of period 69,600 59,498
Carrying amount 59,498 59,498
Disposals, intangible assets other than goodwill 0 0
License agreements | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (49,034) (42,586)
Amortization 8,572 6,448
Balance, end of period (57,606) (49,034)
Carrying amount (49,034) (42,586)
Disposals, intangible assets other than goodwill 0 0
Computer software    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   17,060
Balance, end of period 21,790  
Carrying amount 21,790 17,060
Computer software | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 49,771 48,776
Additions 9,363 2,852
Additions through business acquisitions   0
Balance, end of period 58,255 49,771
Carrying amount 49,771 48,776
Disposals, intangible assets other than goodwill 879 1,857
Computer software | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (32,711) (29,528)
Amortization 4,475 4,808
Balance, end of period (36,465) (32,711)
Carrying amount (32,711) (29,528)
Disposals, intangible assets other than goodwill (721) (1,625)
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 1,880 1,880
Additions 0 0
Additions through business acquisitions   0
Balance, end of period 1,790 1,880
Carrying amount 1,880 1,880
Disposals, intangible assets other than goodwill 90 0
Non-compete agreements | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (1,880) (1,812)
Amortization 0 68
Balance, end of period (1,790) (1,880)
Carrying amount (1,880) (1,812)
Disposals, intangible assets other than goodwill (90) 0
Trademarks    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period   225,064
Balance, end of period 224,364  
Carrying amount 224,364 225,064
Trademarks | Gross carrying amount    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period 226,172 174,772
Additions 0 0
Additions through business acquisitions   51,400
Balance, end of period 226,172 226,172
Carrying amount 226,172 174,772
Disposals, intangible assets other than goodwill 0 0
Trademarks | Accumulated amortization    
Changes in intangible assets other than goodwill [abstract]    
Balance, beginning of period (1,108) (125)
Amortization 700 983
Balance, end of period (1,808) (1,108)
Carrying amount (1,108) (125)
Disposals, intangible assets other than goodwill $ 0 $ 0