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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 ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 31, 2015
USD ($)
Debt Instrument [Line Items]              
Warrants issued to lenders       $ 0 $ 3,500,000 $ 0  
Amortization of deferred loan costs       3,250,000 2,563,000 349,000  
Notes and deferred payments to sellers       0 11,588,000 0  
Notes payable       88,755,000 98,950,000    
Debt extinguishment         800,000    
Interest expense and accreted interest       12,350,000 9,800,000 $ 2,628,000  
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     2        
Debt instrument financial covenants maximum ratio of secured indebtedness to EBITDA, period two     1.8        
Debt instrument financial covenants, minimum daily cash collateral, period two     $ 15,000,000        
Debt instrument, financial covenants minimum rolling four quarter gross margin in contract backlog, period one     65,000,000        
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 deferred loan costs       2,100,000 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       612,000 1,557,000    
Equipment-based Facility              
Debt Instrument [Line Items]              
Line of credit, maximum borrowing capacity             $ 40,000,000
Equipment-Based Term Loan              
Debt Instrument [Line Items]              
Line of credit, maximum borrowing capacity             20,000,000
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 issued to lenders     $ 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        
Notes and deferred payments to sellers     $ 11,600,000        
Accretion expense       $ 1,200,000 $ 800,000    
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%      
Discount Rate | Tealstone              
Debt Instrument [Line Items]              
Fair value inputs, discount rate     0.12