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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Information about Litigation Matters    
Number of vendors company purchased engines 1  
Construction Commitments    
Property and construction commitments $ 1.8  
Letters of Credit    
Letters of credit outstanding, amount 70.9 73.9
Letter of credit outstanding outside of the Senior credit facility $ 18.3