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Long-Term Debt Senior Secured Second Lien Notes (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 23, 2017
Sep. 30, 2018
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Apr. 29, 2015
Debt Instrument [Line Items]            
Proceeds from issuance of senior secured second lien notes     $ 0 $ 79,875,000 $ 0  
Interest Rate           8.00%
Proceeds from Issuance of Debt $ 35,500,000 $ 75,000,000        
Repayments of Debt 42,600,000          
Debt Issuance Costs, Net $ 1,800,000   $ 3,673,000 $ 4,770,000    
Collateral exclusion for material subsidiaries, percentage of Senior Notes     20.00%      
Senior Notes, Cross Default Provision, Minimum Debt Principal Amount     $ 20,000,000      
Debt Instrument, Redemption, Period Two [Member]            
Debt Instrument [Line Items]            
Senior Notes, Redemption Price     1.04      
Debt Instrument, Redemption, Period Three [Member]            
Debt Instrument [Line Items]            
Senior Notes, Redemption Price     1.02      
Debt Instrument, Redemption, Period Four [Member]            
Debt Instrument [Line Items]            
Senior Notes, Redemption Price     $ 1.00