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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 28, 2014
Dec. 27, 2013
Workers' Compensation Commitments [Line Items]    
Cash collateral held by insurance carriers $ 23.0 $ 23.7
Cash and cash equivalents held in Trust 37.1 [1] 31.5 [1]
Investments held in Trust 81.9 86.7
Letters of credit 7.8 [2] 7.9 [2]
Surety bonds 15.7 [3] 16.1 [3]
Total collateral commitments 165.5 165.9
Accrued interest on trust investments 0.8 0.8
Cash collateral backing letters of credit $ 1.9 $ 1.9
Surety bonds annual fee limit, % of bond amount 2.00%  
Surety bonds required cancellation notice 60 days  
Minimum
    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 1 year  
Maximum
    
Workers' Compensation Commitments [Line Items]    
Surety bonds review and renewal period if elected 4 years  
[1] Included in this amount is $0.8 million of accrued interest at March 28, 2014 and December 27, 2013.
[2] We have agreements with certain financial institutions to issue letters of credit as collateral. We had $1.9 million of restricted cash collateralizing our letters of credit at March 28, 2014 and December 27, 2013.
[3] Our surety bonds are issued by independent insurance companies on our behalf and bear annual fees based on a percentage of the bond, which is determined by each independent surety carrier. These fees do not exceed 2.0% of the bond amount, subject to a minimum charge. The terms of these bonds are subject to review and renewal every one to four years and most bonds can be canceled by the sureties with as little as 60 days notice.