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Commitments and Contingencies - Legal Proceedings (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 52 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2021 USD ($) | Aug. 31, 2020 USD ($) | Jul. 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2020 USD ($) | Apr. 30, 2019 USD ($) | Nov. 30, 2021 USD ($) | Aug. 31, 2019 building
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Profit |  |  |  |  | $ (534,676) | $ (507,514) |  |  | $ (1,355,277) | $ (1,194,974) |  |  |  |  |
Number of buildings with property damage | building |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Lorenzo Benton v Telecom Network Specialists Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought | $ 37,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded |  |  |  |  |  |  |  |  |  |  |  | $ 9,500 |  |  |
Reasonably possible estimate of loss |  |  |  |  | 9,500 |  |  |  | 9,500 |  |  |  |  |  |
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 |  |  |  |  |  |
Disputed Contract Termination | Adjustment | Correction of Estimated Project Costs and Percentage of Completion Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Redes | Disputed Contract Termination | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed in arbitration |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 190,000 |
QPS Engineering, LLC | Maurepas Project Dispute |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  |  | $ 22,000 |  |  |  |  |  |  |
PRONATEL | Disputed Contract Termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  | $ 38,000 |  | $ 45,000 |  |  |  |  |  |  |  |  |  |  |
Bond proceeds received |  |  |  | $ 112,000 |  |  |  |  |  |  |  |  |  |  |
Maurepas | Maurepas Project Dispute |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  | $ 59,000 |  |  |  |  |  |  |  |  |  |  |  |

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