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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 |  |  |  |  |  |  |  |  |

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