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Credit Facility (Details) - USD ($)
$ in Millions
Jul. 15, 2015
Jun. 27, 2015
Dec. 27, 2014
Line of Credit Facility [Line Items]      
Line of credit, amount drawn   $ 37 $ 0
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility line of credit   $ 100  
Repayment of amount outstanding $ 2    
Minimum [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Margin rates   1.75%  
Maximum [Member] | Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility line of credit   $ 150  
Margin rates   2.25%