Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS - Narrative (Details)

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ACQUISITIONS - Narrative (Details)
$ in Thousands, NZD in Millions
 3 Months Ended 12 Months Ended
Oct. 02, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
NZD
Dec. 30, 2017
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Trademarks            
Business Acquisition [Line Items]            
Estimated useful lives of intangible assets         16 years 16 years
Customer relationships            
Business Acquisition [Line Items]            
Estimated useful lives of intangible assets         18 years 20 years
Williamson-Dickie Mfg. Co.            
Business Acquisition [Line Items]            
Percentage of voting interests acquired 100.00%          
Payments to acquire businesses $ 800,700          
Revenues         $ 247,200  
Net income         11,400  
Accounts receivable 146,403          
Intangible assets 397,755          
Transaction costs           $ 12,200
Williamson-Dickie Mfg. Co. | Trademarks            
Business Acquisition [Line Items]            
Intangible assets 800          
Estimated useful lives of intangible assets       3 years    
Williamson-Dickie Mfg. Co. | Customer relationships            
Business Acquisition [Line Items]            
Intangible assets 78,600          
Williamson-Dickie Mfg. Co. | Distribution Rights            
Business Acquisition [Line Items]            
Intangible assets 2,300          
Estimated useful lives of intangible assets       4 years    
Williamson-Dickie Mfg. Co. | Acquisition-related Costs            
Business Acquisition [Line Items]            
Expense related to executive compensation plans         $ 41,600 $ 4,100
Minimum            
Business Acquisition [Line Items]            
Estimated useful lives of intangible assets         3 years  
Minimum | Williamson-Dickie Mfg. Co. | Customer relationships            
Business Acquisition [Line Items]            
Estimated useful lives of intangible assets       10 years    
Maximum            
Business Acquisition [Line Items]            
Estimated useful lives of intangible assets         24 years  
Maximum | Williamson-Dickie Mfg. Co. | Customer relationships            
Business Acquisition [Line Items]            
Estimated useful lives of intangible assets       13 years    
Scenario, Forecast | Icebreaker Holdings, Ltd            
Business Acquisition [Line Items]            
Percentage of voting interests acquired   100.00% 100.00%      
Payments to acquire businesses   $ 204,300 NZD 288      
Trademarks | Williamson-Dickie Mfg. Co.            
Business Acquisition [Line Items]            
Intangible assets 316,100          
Imagewear | Williamson-Dickie Mfg. Co.            
Business Acquisition [Line Items]            
Goodwill, expected tax deductible amount $ 53,600