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DEBT OBLIGATIONS - Line of credit (Details)
3 Months Ended 12 Months Ended
May 06, 2020
Apr. 07, 2020
USD ($)
Oct. 28, 2019
USD ($)
Jun. 26, 2019
USD ($)
Apr. 03, 2020
USD ($)
Dec. 28, 2018
USD ($)
Dec. 27, 2019
USD ($)
Dec. 20, 2018
USD ($)
Utility Customer Agreement                
Debt Instrument [Line Items]                
Interest rate (as a percent)               4.332%
Unsecured notes payable         $ 800,000   $ 900,000  
Amount committed to repay               $ 1,700,000
E3, Inc.                
Debt Instrument [Line Items]                
Proceeds from borrowings     $ 30,000,000          
2019 Credit Agreement [Member]                
Debt Instrument [Line Items]                
Minimum fixed charge coverage ratio         1.20      
2019 Credit Agreement [Member] | Debt Covenant Threshold Tranche One                
Debt Instrument [Line Items]                
Maximum total leverage ratio         3.50      
2019 Credit Agreement [Member] | Debt Covenant Threshold Tranche Two                
Debt Instrument [Line Items]                
Maximum total leverage ratio         3.25      
Term A Loan | BMO                
Debt Instrument [Line Items]                
The aggregate amount under the revolving line of credit       $ 100,000,000        
Delayed Draw Term Loan Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity       50,000,000        
Revolving Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity       $ 50,000,000        
Revolving Credit Facility | Subsequent Event                
Debt Instrument [Line Items]                
Proceeds from borrowings   $ 10,000,000            
Maximum borrowing capacity   $ 36,000,000            
Revolving Credit Facility | Maximum | Subsequent Event                
Debt Instrument [Line Items]                
Commitment fee (as a percent) 0.45%              
Revolving Credit Facility | Minimum | Subsequent Event                
Debt Instrument [Line Items]                
Commitment fee (as a percent) 0.15%              
Letters of Credit | Maximum | Subsequent Event                
Debt Instrument [Line Items]                
Commitment fee (as a percent) 2.50%              
Letters of Credit | Minimum | Subsequent Event                
Debt Instrument [Line Items]                
Commitment fee (as a percent) 0.84%              
Notes payable for IBM                
Debt Instrument [Line Items]                
Interest rate (as a percent)           4.656%    
Interest and principal payments           $ 6,000    
Notes payable for IBM | Software Agreements                
Debt Instrument [Line Items]                
Software cost           $ 200,000    
Unsecured notes payable         $ 110,000   $ 133,000