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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Workers' Compensation Commitments [Line Items]    
Cash collateral held by insurance carriers $ 21.5 $ 21.3
Cash and cash equivalents held in Trust 14.8 [1] 19.2 [1]
Investments held in Trust 91.2 78.0
Letters of credit 9.0 [2] 16.7 [2]
Surety bonds 16.2 [3] 16.2 [3]
Total collateral commitments 152.7 151.4
Accrued interest on trust investments 0.9 0.8
Cash collateral backing letters of credit $ 1.8 $ 5.9
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 $0.9 million and $0.8 million of accrued interest at December 28, 2012 and December 30, 2011, respectively.
[2] We have agreements with certain financial institutions to issue letters of credit as collateral. We had $1.8 million and $5.9 million of restricted cash collateralizing our letters of credit at December 28, 2012 and December 30, 2011, respectively.
[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, but 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.