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Commitments, Contingencies and Other Matters - Additional Information (Details) |  |  |  |  |  | 9 Months Ended
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Jun. 30, 2023 USD ($) | Dec. 31, 2021 USD ($) | Jul. 01, 2021 USD ($) facility shares | May 27, 2021 USD ($) | Sep. 09, 2017 Claim | Sep. 30, 2021 USD ($) facility Installment
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  | $ 19,600,000
Number of deferred payment installment related to payroll taxes | Installment |  |  |  |  |  | 2
Deferred payment related to payroll taxes amount |  |  |  |  |  | $ 20,000,000.0
Estimated construction existing active capital projects cost |  |  |  |  |  | 16,300,000
Cost already spent on existing active capital projects |  |  |  |  |  | 4,800,000
Remaining capital required for existing active capital projects |  |  |  |  |  | $ 11,500,000
Number of marketed idle facilities | facility |  |  |  |  |  | 7
Youth Division |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Number of company -owned youth facilities entered into lease agreements | facility |  |  | 6 |  |  |
Loss on asset divestiture |  |  |  |  |  | $ 5,000,000
Youth Division | Term Note |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Proceeds from divestiture of businesses |  |  | $ 10,000,000 |  |  |
Debt instrument, maturity date |  |  | Jul. 01, 2026 |  |  |
Stated interest rate |  |  | 5.00% |  |  |
Principal payments due annually |  |  | $ 250,000 |  |  |
Youth Division | Grid Note |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Debt instrument, maturity date |  |  | Dec. 31, 2022 |  |  |
Working capital line of credit |  |  | $ 4,000,000 |  |  |
Debt instrument basis spread on variable rate |  |  | 1.00% |  |  |
Basis spread rate, description |  |  |  |  |  | Additionally, the Company has provided a $4 million working capital line of credit (“Grid Note”) which matures on December 31, 2022 and bears daily interest at prime minus 1%. Each loan under the Grid Note is payable upon the earlier of (i) on demand, (ii) thirty days from the funding date, or (iii) the maturity date.
Youth Division | Scenario Forecast | Term Note |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Percentage of additional payment due on excess cash flow | 50.00% |  |  |  |  |
Youth Division | Scenario Forecast | Term Note | Abraxas |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Proceeds from related party debt |  | $ 8,000,000 |  |  |  |
Youth Division | Scenario Forecast | Minimum | Term Note |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Additional payment due equal to 50% of excess cash flow | $ 1,000,000 |  |  |  |  |
George C. Zoley |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Existing agreement termination date |  |  |  | Jun. 30, 2021 |  |
Agreement term |  |  |  | 5 years |  |
Agreement effective date |  |  |  | Jul. 01, 2021 |  |
Existing employment agreement base annual salary and bonus payable |  |  |  | $ 5,851,555 |  |
Deferred compensation arrangement with individual, description |  |  |  |  |  | Additionally, pursuant to the terms of Mr. Zoley’s prior employment agreement, Mr. Zoley will receive payments in the amount of $5,851,555, less any applicable taxes and withholdings, which represents the sum of two (2) years of Mr. Zoley’s base annualized salary and two (2) times Mr. Zoley’s current target bonus under GEO’s Senior Management Performance Award Plan.
George C. Zoley | Separation And General Release Agreement |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Deferred compensation arrangement with individual, description |  |  |  |  |  | Lastly, Mr. Zoley is entitled to receive certain fringe benefits for a ten (10) year period as set forth in the Separation Agreement, including payment of health insurance premiums under the Consolidated Omnibus Budget Reconciliation Act (“COBRA”) for eighteen (18) months and reimbursement of the cost of health insurance coverage for eight and a half (81⁄2) years following the first eighteen (18) months, life insurance, the use of an executive automobile, and personal use of the Company leased aircraft for thirty (30) hours per year. In the event of Mr. Zoley’s death within such ten (10) year period, the Company will continue to provide the Fringe Benefits to Mr. Zoley’s covered dependents, and, if applicable to Mr. Zoley’s estate.
Fringe benefits entitlement period |  |  |  | 10 years |  |
Health insurance premium payment entitlement period |  |  |  | 18 months |  |
Health insurance coverage cost reimbursement entitlement period |  |  |  | 8 years 6 months |  |
Life insurance entitlement period |  |  |  | 18 months |  |
Executive automobile and aircraft usage entitlement period |  |  |  |  |  | thirty (30) hours per year
George C. Zoley | Executive Chairman Agreement |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Agreement term |  |  | 5 years |  |  |
Agreement effective date |  |  | Jul. 01, 2021 |  |  |
Deferred compensation arrangement with individual, description |  |  |  |  |  | Under the terms of the Executive Chairman Agreement, Mr. Zoley will be paid an annual base salary of $1.0 million and will be eligible to receive target annual performance awards equal to 100% of base salary in accordance with the terms of any plan governing senior management performance awards. Mr. Zoley will also be entitled to receive an annual equity incentive award with a grant date fair value equal to 100% of base salary and subject to a time-based vesting schedule of one (1) year from the date of grant. Additionally, the Company will credit Mr. Zoley’s account balance under the Amended and Restated Executive Retirement Agreement on an annual basis in an amount equal to 100% of his base salary.
Agreement termination date |  |  | Jun. 30, 2026 |  |  |
Agreement renewal term |  |  | 1 year |  |  |
Agreement termination minimum period for written notice |  |  | 1 year |  |  |
Annual base salary payable |  |  | $ 1,000,000.0 |  |  |
Equity incentive award vesting period |  |  | 1 year |  |  |
Non-competition covenant period upon termination |  |  | 3 years |  |  |
George C. Zoley | Amended and Restated Executive Retirement Agreement |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Agreement effective date |  |  | Jul. 01, 2021 |  |  |
Deferred compensation arrangement with individual, cash payment |  |  | $ 3,600,000 |  |  |
Deferred compensation, interest rate on cash payment |  |  | 5.00% |  |  |
Deferred compensation arrangement with individual, employer contribution |  |  | $ 1,000,000 |  |  |
Deferred compensation, interest rate on employer contribution |  |  | 5.00% |  |  |
Deferred compensation, lump sum cash payment, delay period |  |  | 6 months |  |  |
Jose Gordo | Executive Employment Agreement |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Agreement term |  |  | 3 years |  |  |
Agreement effective date |  |  | Jul. 01, 2021 |  |  |
Deferred compensation arrangement with individual, description |  |  |  |  |  | The Employment Agreement provides that upon the termination of the agreement by Mr. Gordo for good reason, by the Company without cause or upon the death or disability of Mr. Gordo, he will be entitled to receive a termination payment equal to two (2) times the sum of his annual base salary plus target bonus for the fiscal year in which his employment is terminated or, if greater, the target bonus for the fiscal year immediately prior to such termination.
Agreement renewal term |  |  | 3 years |  |  |
Agreement termination minimum period for written notice |  |  | 30 days |  |  |
Annual base salary payable |  |  | $ 900,000 |  |  |
Non-competition covenant period upon termination |  |  | 3 years |  |  |
Percentage of annual performance award entitled |  |  | 85.00% |  |  |
Executive benefits cover period upon termination |  |  | 5 years |  |  |
Percentage of interest rate on unpaid termination payment |  |  | 18.00% |  |  |
Jose Gordo | Executive Employment Agreement | Performance Shares |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Equity incentive award vesting period |  |  | 3 years |  |  |
Number of shares granted | shares |  |  | 50,000 |  |  |
Pending Litigation | Immigration Detainees Against Company |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Number of claims filed | Claim |  |  |  |  | 3 |
WASHINGTON | Pending Litigation | Immigration Detainees Against Company |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Number of claims filed | Claim |  |  |  |  | 2 |
CALIFORNIA | Pending Litigation | Immigration Detainees Against Company |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Number of claims filed | Claim |  |  |  |  | 1 |

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