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Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 29, 2013
Dec. 28, 2012
Standby Letters of Credit [Member]
Variable Interest Entity [Line Items]    
Variable interest entity, total assets $ 44.9  
Variable interest entity, total liabilities 8.7  
Variable interest entity, long-term debt 3.4  
Letter of credit facility, amount applied to guarantee VIE debt   $ 0.8