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Credit Agreement (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 30, 2017
Revolving credit facility    
Senior Loan Agreement    
Revolving credit facility, maximum capacity $ 125.0  
Amount of borrowings under revolving credit facility 10.0 $ 0.0
Letters of credit    
Senior Loan Agreement    
Revolving credit facility, maximum capacity 15.0  
Amounts outstanding under letters of credit $ 3.6