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Commitments and Contingencies - Legal Proceedings (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 52 Months Ended
Aug. 31, 2020
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2017
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2015
Apr. 30, 2019
Loss Contingencies [Line Items]                        
Gross Profit         $ (507,514) $ (473,445)     $ (1,194,974) $ (1,156,931)    
Lorenzo Benton v Telecom Network Specialists Inc                        
Loss Contingencies [Line Items]                        
Damages awarded   $ 8,800                    
Reasonably possible estimate of loss         8,800       8,800      
Disputed Contract Termination                        
Loss Contingencies [Line Items]                        
Charge to earnings related to legal proceedings             $ 79,200          
Net receivable position on projects         120,000       120,000      
Adjustment | Correction of Estimated Project Costs and Percentage of Completion Method | Disputed Contract Termination                        
Loss Contingencies [Line Items]                        
Gross Profit             $ 14,500          
Redes | Telecommunication Networks Construction and Operation                        
Loss Contingencies [Line Items]                        
Term of post-construction operation and maintenance period                     10 years  
Redes | Disputed Contract Termination                        
Loss Contingencies [Line Items]                        
Advance payments received                     $ 87,000  
On-demand performance bonds                     25,000  
Construction costs incurred                       $ 157,000
Payments received on construction contracts                       $ 100,000
Net receivable position on projects         $ 87,000       $ 87,000      
Redes | Disputed Contract Termination | Telecommunication Networks Construction and Operation                        
Loss Contingencies [Line Items]                        
Aggregate consideration for projects                     248,000  
Aggregate consideration to be paid during the construction period                     151,000  
Aggregate consideration to be paid during the post-construction operation and maintenance period                     $ 97,000  
QPS Engineering, LLC | Maurepas Project Dispute                        
Loss Contingencies [Line Items]                        
Damages sought               $ 22,000        
PRONATEL | Disputed Contract Termination                        
Loss Contingencies [Line Items]                        
Damages sought $ 44,000     $ 45,000                
Bond proceeds received       $ 112,000                
Maurepas | Maurepas Project Dispute                        
Loss Contingencies [Line Items]                        
Damages sought     $ 59,000