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Secured Credit Facility and Other Debt - Narrative (Details)
12 Months Ended
Apr. 03, 2020
USD ($)
Apr. 03, 2019
USD ($)
Apr. 03, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
May 31, 2015
USD ($)
Debt Instrument [Line Items]              
Notes and deferred payments to sellers       $ 11,588,000 $ 0 $ 0  
Total loans, Net       90,138,000 5,394,000    
Debt extinguishment       800,000   200,000  
Interest expense       9,800,000 2,628,000 $ 3,012,000  
Revolving Credit Facility              
Debt Instrument [Line Items]              
Borrowings on equipment based facility       0 0    
Loan and Security Agreement | Senior Secured Term Loans | Wilmington Trust, National Association              
Debt Instrument [Line Items]              
Debt instrument, face amount     $ 85,000,000        
Loan prepayment offer required to make quarterly percentage     75.00%        
Debt instrument financial covenants maximum ratio of secured indebtedness to EBITDA, period one     3.10        
Debt instrument financial covenants maximum ratio of secured indebtedness to EBITDA, period two     1.80        
Debt instrument financial covenants, minimum daily cash collateral, period two     $ 15,000,000        
Debt instrument financial covenants, minimum daily cash collateral, potential additional period     18,000,000        
Debt instrument, financial covenants minimum rolling four quarter gross margin in contract backlog, period one     60,000,000        
Debt instrument, financial covenants minimum rolling four quarter gross margin in contract backlog period two     70,000,000        
Debt instrument, financial covenants, maximum incurrence of net capital expenditures during each of four consecutive fiscal quarters     15,000,000        
Debt instrument, financial covenants, minimum bonding capacity     1,000,000,000        
Debt instrument financial covenants minimum EBITDA during each four consecutive fiscal quarters     $ 12,000,000        
Debt issuance costs       $ 10,400,000      
Debt instrument, term       5 years      
Amortization of debt issuance costs       $ 1,600,000      
Loan and Security Agreement | Senior Secured Term Loans | London Interbank Offered Rate (LIBOR) | Wilmington Trust, National Association              
Debt Instrument [Line Items]              
Basis spread on variable rate     8.75%        
Notes Payable for Transportation and Construction Equipment              
Debt Instrument [Line Items]              
Notes payable       1,600,000 2,700,000    
Equipment-based Facility              
Debt Instrument [Line Items]              
Remaining borrowing capacity         20,000,000    
Line of credit, maximum borrowing capacity             $ 40,000,000
Equipment-based Facility | Senior Secured Term Loans | Nations              
Debt Instrument [Line Items]              
Debt issuance costs       8,812,000 803,000    
Total loans, Net       76,188,000 2,729,000    
Equipment-Based Term Loan              
Debt Instrument [Line Items]              
Borrowings on equipment based facility         3,500,000    
Debt extinguishment         300,000    
Line of credit, maximum borrowing capacity             20,000,000
Repayments of long-term debt         $ 10,000,000    
Equipment Based Revolving Line Of Credit              
Debt Instrument [Line Items]              
Line of credit, maximum borrowing capacity             $ 20,000,000
Warrants to the Lenders Under the Loan Agreement              
Debt Instrument [Line Items]              
Warrants value     $ 3,500,000 3,500,000      
Tealstone              
Debt Instrument [Line Items]              
Promissory notes issued to the sellers     5,000,000        
Cash, net of cash acquired     $ 54,861,000        
Fair value inputs, discount rate     12.00%        
Notes and deferred payments to sellers     $ 11,600,000        
Accretion expense       $ 800,000      
Scenario, Forecast | Tealstone              
Debt Instrument [Line Items]              
Cash, net of cash acquired $ 7,500,000 $ 2,426,000          
Minimum | Notes Payable for Transportation and Construction Equipment              
Debt Instrument [Line Items]              
Debt instrument, term       3 years      
Stated interest rate       3.15%      
Maximum | Notes Payable for Transportation and Construction Equipment              
Debt Instrument [Line Items]              
Debt instrument, term       5 years      
Stated interest rate       6.92%