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Long-Term Debt Senior Credit Facility (Details) - USD ($)
3 Months Ended
Jun. 23, 2017
Sep. 30, 2018
Dec. 30, 2018
Jun. 20, 2017
Jan. 13, 2017
Apr. 29, 2015
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity       $ 300,000,000.0    
Proceeds from Issuance of Debt $ 35,500,000 $ 75,000,000        
Line of Credit Facility, Current Borrowing Capacity         $ 73,000,000  
Line of Credit Facility, Potential Incremental Increases         25,000,000  
Long-term Line of Credit     $ 0      
Letters of Credit Outstanding, Amount     11,600,000      
Line of Credit Facility, Unused Borrowing Capacity         $ 61,400,000  
Interest Rate           8.00%
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Current Borrowing Capacity     $ 20,000,000      
Base Rate [Member]            
Debt Instrument [Line Items]            
Interest Rate     1.75%      
Base Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Interest Rate     1.75%      
Base Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Interest Rate     2.75%      
London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Interest Rate at Period End     2.75%      
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Interest Rate     2.75%      
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Interest Rate     3.75%