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v3.24.3

Revolving Notes - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Aug. 31, 2024 USD ($) Facility | Aug. 31, 2023 USD ($)
Line of Credit Facility [Line Items] |  |  |
Long-term line of credit |  | $ 351,600,000 | $ 297,100,000
Repayments of revolving notes in 2025 |  | 42,800,000 |
Repayments of revolving notes in 2026 |  | 265,500,000 |
Repayments of revolving notes in 2027 |  | 312,400,000 |
European |  |  |
Line of Credit Facility [Line Items] |  |  |
Aggregate amount available to draw down |  | 31,600,000 |
Line of credit, guaranteed amount |  | 33,100,000 |
Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility maximum capacity |  | $ 66,000,000 |
Minimum | European |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit maturity date |  | 2024-10 |
Minimum | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility borrowings outstanding due period |  | 2025-02 |
Maximum | European |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit maturity date |  | 2026-09 |
Maximum | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility borrowings outstanding due period |  | 2027-01 |
WIBOR | Minimum | European |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 1.10% |
WIBOR | Maximum | European |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 1.45% |
EURIBOR | European |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 1.90% |
Senior Secured Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of senior secured credit facilities | Facility |  | 4 |
Line of credit facility maximum capacity |  | $ 1,400,000,000 |
Letter of credit facility outstanding amount |  | 5,900,000 | 4,900,000
Senior Secured Credit Facilities | North American |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term line of credit |  | 0 |
Senior Secured Credit Facilities | European |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term line of credit |  | 46,700,000 | 47,200,000
Senior Secured Credit Facilities | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Long-term line of credit |  | 110,000,000.0 | 110,000,000.0
Committed Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Aggregate amount available to draw down |  | 345,900,000 |
Committed Credit Facilities | North American |  |  |
Line of Credit Facility [Line Items] |  |  |
Aggregate amount available to draw down |  | 258,300,000 |
Committed Credit Facilities | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Aggregate amount available to draw down |  | 56,000,000 |
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Repayments of revolving notes in 2025 |  | 154,400,000 |
Repayments of revolving notes in 2026 |  | 2,300,000 |
Repayments of revolving notes in 2027 |  | 194,900,000 |
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | North American |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility maximum capacity |  | $ 600,000,000 |
Line of credit maturity date |  | 2026-08 |
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | European |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility maximum capacity |  | $ 78,200,000 |
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | Prime Rate | North American |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 0.50% |
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | SOFR | North American |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 1.50% |
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | SOFR Adjustment | North American |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 0.10% |
GBX Leasing |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility maximum capacity | $ 450,000,000 | $ 550,000,000 |
Line of credit maturity date | 2029-09 | 2027-08 |
Notional covering percentage of outstanding balance |  | 74.00% |
Warehouse Credit Facility Reduces | $ (100,000,000) |  |
Long-term line of credit |  | $ 194,900,000 | $ 139,900,000
GBX Leasing | SOFR |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 1.85% |
GBX Leasing | SOFR Adjustment |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 0.11% |
Mexican Railcar Manufacturing Joint Venture Line of Credit, 4 Component of Senior Secured Credit Facilities | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of credit facility maximum capacity |  | $ 166,000,000 |
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | LIBOR | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 4.25% |
Mexican Railcar Manufacturing Operations Line of Credit 2, 3rd Component of Senior Secured Credit Facilities | SOFR | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, percentage points added to the reference rate |  | 2.22% |
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities | Mexican |  |  |
Line of Credit Facility [Line Items] |  |  |
Joint venture partner each guaranteed percentage |  | 50.00% |

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