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Secured Credit Facility and Other Debt - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 03, 2020
USD ($)
Apr. 03, 2019
USD ($)
Apr. 03, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                
Amortization of debt issuance costs       $ 500,000 $ 500,000 $ 1,000,000 $ 500,000  
Notes and deferred payments to sellers           0   $ 11,647,000
Notes payable for transportation and construction equipment and other                
Debt Instrument [Line Items]                
Notes payable, noncurrent       $ 1,100,000   $ 1,100,000   $ 1,600,000
Notes payable for transportation and construction equipment and other | Minimum                
Debt Instrument [Line Items]                
Debt instrument, term           2 years    
Debt instrument, interest rate, stated percentage       3.15%   3.15%    
Notes payable for transportation and construction equipment and other | Maximum                
Debt Instrument [Line Items]                
Debt instrument, term           5 years    
Debt instrument, interest rate, stated percentage       6.92%   6.92%    
Warrants to the Lenders Under the Loan Agreement                
Debt Instrument [Line Items]                
Warrants and rights outstanding       $ 3,500,000   $ 3,500,000    
Notes and deferred payments to sellers, Tealstone acquisition                
Debt Instrument [Line Items]                
Promissory notes issued to the sellers     $ 5,000,000     5,000,000    
Cash payments to the seller     $ 55,000,000          
Fair value inputs, discount rate     12.00%          
Notes and deferred payments to sellers     $ 11,600,000          
Accretion expense       $ 300,000   $ 600,000    
Notes and deferred payments to sellers, Tealstone acquisition | Scenario, Forecast                
Debt Instrument [Line Items]                
Cash payments to the seller $ 7,500,000 $ 2,426,000            
Term loan | Senior secured term loans | Loan and security agreement                
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     2.2          
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, net     $ 10,400,000          
Debt instrument, term     5 years          
Term loan | Senior secured term loans | Loan and security agreement | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate     8.75%