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Multiemployer Employee Benefit Plans (Details) (Multiemployer Defined Benefit Pension Plans [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
Jan. 26, 2013
Dec. 29, 2012
Dec. 31, 2011
Jun. 30, 2012
Multiemployer Plans [Line Items]        
Approximate percentage of union representatives on the boards of multiemployer plans   50.00%    
Approximate percentage of contributing employer representatives on the boards of multiemployer plans   50.00%    
Provisions recorded for multiemployer pension withdrawal liabilities $ 40.7 $ 2.5 $ 4.5  
Recorded multiemployer pension withdrawal liability   14.0 46.9 30.7
Aggregate Multiemployer Plan Withdrawal Liability [Member]
       
Multiemployer Plans [Line Items]        
Tax rate for potential IRS non-deductible excise tax   5.00%    
Statutory period for company exposure to additional liability after voluntary withdrwal from a multiemployer plan   2 years    
Loss contingency, estimate of possible loss $ 80.0 $ 115.0