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Borrowings (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2015
Sep. 29, 2015
Jun. 04, 2015
Jun. 03, 2015
Line of Credit Facility [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 75.0 $ 45.0
Amount outstanding $ 60.4 $ 60.4    
Remaining borrowing capacity 11.8 11.8    
Letters of credit outstanding $ 2.8 $ 2.8    
Minimum [Member]        
Line of Credit Facility [Line Items]        
Interest rate 3.50% 3.50%    
Maximum [Member]        
Line of Credit Facility [Line Items]        
Interest rate 3.75%