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Revolving Credit Facilities (Narrative) (Details) - USD ($)
Jul. 12, 2016
Dec. 30, 2017
Mar. 25, 2017
Line of Credit Facility [Line Items]      
Long-term line of credit, noncurrent   $ 0 $ 60,000,000
Wells Fargo Bank | Amended Credit Agreement | Amended Facility      
Line of Credit Facility [Line Items]      
Line of credit facility maximum borrowing capacity $ 300,000,000    
Covenant terms, leverage ratio requirement 300.00%    
Covenant terms fixed charge ratio requirement 125.00%    
Long-term line of credit, noncurrent   $ 0  
Wells Fargo Bank | Amended Credit Agreement | Amended Facility | Minimum      
Line of Credit Facility [Line Items]      
Line of credit facility, unused capacity, commitment fee percentage 0.20%    
Wells Fargo Bank | Amended Credit Agreement | Amended Facility | Maximum      
Line of Credit Facility [Line Items]      
Line of credit facility, unused capacity, commitment fee percentage 0.30%    
Wells Fargo Bank | Amended Credit Agreement | Amended Facility | Base Rate | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.00%    
Wells Fargo Bank | Amended Credit Agreement | Amended Facility | Base Rate | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 0.50%    
Wells Fargo Bank | Amended Credit Agreement | Amended Facility | London Interbank Offered Rate (LIBOR) | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 1.25%    
Wells Fargo Bank | Amended Credit Agreement | Amended Facility | London Interbank Offered Rate (LIBOR) | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate 2.00%