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Long-Term Debt and Capital Lease Obligations (Additional Disclosures) (Details)
12 Months Ended
Dec. 26, 2015
USD ($)
Apr. 30, 2015
USD ($)
payment
Mar. 31, 2015
USD ($)
Dec. 27, 2014
USD ($)
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 1,300,000,000.0 $ 1,300,000,000.0 $ 970,000,000  
Term loan facility   400,000,000.0    
Line of credit facility, maximum borrowing facility   $ 900,000,000.0    
Number of quarterly installment payments | payment   20    
Debt, weighted average interest rate 1.33%     1.42%
EBITDA less capital expenditures to cash interest expense covenant ratio 3.5      
Indebtedness to EBITDA covenant ratio 3.5      
Capital lease obligations $ 33,600,000     $ 1,000,000
Argenta and BioFocus UK | Financing Obligation        
Debt Instrument [Line Items]        
Capital lease obligations 35,800,000      
Letter of Credit        
Debt Instrument [Line Items]        
Outstanding under letters of credit $ 4,900,000     $ 5,000,000
Federal Funds Effective Swap Rate        
Debt Instrument [Line Items]        
Interest rate margin (as a percent) 0.50%      
LIBOR        
Debt Instrument [Line Items]        
Interest rate margin (as a percent) 1.00%