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FAIR VALUE MEASUREMENT (Details) (USD $)
In Millions, unless otherwise specified
Mar. 28, 2014
Dec. 27, 2013
Fair Value Measurement [Line Items]    
Marketable securities classified as available-for-sale $ 36.3 $ 20.7
Restricted investments classified as held-to-maturity 82.6 86.9
Marketable securities classified as available-for-sale securities due after one year 4.5  
Certificates of deposit
    
Fair Value Measurement [Line Items]    
Marketable securities classified as available-for-sale 9.5 9.9
Certificates of deposit | Other assets
    
Fair Value Measurement [Line Items]    
Marketable securities classified as available-for-sale securities due after one year 4.5 [1] 6.0 [1]
Carrying Value
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 128.8 [2] 122.0 [2]
Marketable securities classified as available-for-sale 36.3 [3] 20.7 [3]
Carrying Value | Restricted Assets
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 62.0 [2] 57.1 [2]
Other restricted assets 7.4 [4] 10.8 [4]
Restricted investments classified as held-to-maturity 82.0 [5] 86.7 [5]
Total Fair Value
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 128.8 [2] 122.0 [2]
Marketable securities classified as available-for-sale 36.3 [3] 20.7 [3]
Total Fair Value | Restricted Assets
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 62.0 [2] 57.1 [2]
Other restricted assets 7.4 [4] 10.8 [4]
Restricted investments classified as held-to-maturity 82.5 [5] 86.9 [5]
Level 1
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 128.8 [2] 122.0 [2]
Marketable securities classified as available-for-sale 0 [3] 0 [3]
Level 1 | Restricted Assets
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 62.0 [2] 57.1 [2]
Other restricted assets 7.4 [4] 10.8 [4]
Restricted investments classified as held-to-maturity 0 [5] 0 [5]
Level 2
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 0 [2] 0 [2]
Marketable securities classified as available-for-sale 36.3 [3] 20.7 [3]
Level 2 | Restricted Assets
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 0 [2] 0 [2]
Other restricted assets 0 [4] 0 [4]
Restricted investments classified as held-to-maturity 82.5 [5] 86.9 [5]
Level 3
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 0 [2] 0 [2]
Marketable securities classified as available-for-sale 0 [3]    [3]
Level 3 | Restricted Assets
    
Fair Value Measurement [Line Items]    
Cash and cash equivalents 0 [2] 0 [2]
Other restricted assets 0 [4] 0 [4]
Restricted investments classified as held-to-maturity $ 0 [5] $ 0 [5]
[1] Amounts due after one year include CDs with maturities within two years and are recorded in Other assets on the Consolidated Balance Sheets.
[2] Cash equivalents and restricted cash equivalents consist of money market funds, deposits, and investments with original maturities of three months or less.
[3] Marketable securities include CDs, VRDNs, corporate debt securities, municipal debt securities, and commercial paper, which are classified as available-for-sale. At March 28, 2014 and December 27, 2013, we had $4.5 million and $6.0 million of CDs with maturities greater than one year, which are classified as Other assets on our Consolidated Balance Sheets. VRDNs with contractual maturities beyond one year are classified as short-term based on their highly liquid nature and because they represent the investment of cash that is available for current operations. Despite the long-term nature of their stated contractual maturities, we routinely buy and sell these securities and believe we have the ability to quickly sell them to the re-marketing agent at par value plus accrued interest in the event we decide to liquidate our investment in a particular VRDN.
[4] Other restricted assets consist of restricted cash in money market accounts and deferred compensation plan accounts, which are comprised of mutual funds.
[5] Restricted investments classified as held-to-maturity consist of highly rated investment grade securities, primarily in municipal debt securities, corporate debt securities, asset-backed securities, and U.S. agency debentures.