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INCENTIVE COMPENSATION (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Reserved common stock for future issuance under the LTIP (in shares) 4.8    
Total fair value of the shares vested $ 16.3 $ 0.0 $ 22.4
Total unrecognized compensation cost related to all nonvested awards $ 7.2    
Weighted average period unrecognized compensation cost is expected to be recognized 2 years 1 month 17 days    
Short Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued in costs related to the STIP $ 44.8    
JFC LLC Long-Term Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued in costs related to the STIP 3.3    
Moy Park Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued in costs related to the STIP $ 0.6