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Revolving Notes - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2021 USD ($) Facility CreditFacility | Aug. 31, 2020 USD ($)
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 221,300,000 |
Long-term Line of Credit | $ 325,150,000 | $ 351,526,000
Number of lines of credits | CreditFacility | 3 |
Joint venture partner each guaranteed percentage | 50.00% |
Senior Secured Credit Facilities, Consisting of 4 Components |  |
Line of Credit Facility [Line Items] |  |
Number of senior secured credit facilities | Facility | 4 |
Line of credit facility maximum capacity | $ 1,040,000,000.00 |
Letter of credit facility outstanding amount | 25,200,000 | 28,700,000
Borrowings | 160,000,000.0 | 275,000,000.0
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 600,000,000.0 |
Line of credit maturity date | 2024-06 |
Revolving Line of Credit, 1st Component of Senior Secured Credit Facilities | LIBOR |  |
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 | Prime Rate |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 0.50% |
GBX Leasing Warehouse Facility |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 300,000,000.0 |
Line of credit maturity date | 2025-04 |
Percentage of ownership in join venture | 90.00% |
Letter of credit facility outstanding borrowings | $ 96,600,000 |
GBX Leasing Warehouse Facility | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 2.00% |
European Line of Credit, 2nd Component of Senior Secured Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 71,400,000 |
Long-term Line of Credit | 36,600,000 |
Letter of credit facility outstanding amount | $ 38,600,000 | 46,500,000
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | Minimum |  |
Line of Credit Facility [Line Items] |  |
Line of credit maturity date | 2021-08 |
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | Maximum |  |
Line of Credit Facility [Line Items] |  |
Line of credit maturity date | 2022-09 |
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | WIBOR | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 1.20% |
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | WIBOR | Maximum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 1.50% |
European Line of Credit, 2nd Component of Senior Secured Credit Facilities | EURIBOR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 1.10% |
Mexican Railcar Manufacturing Operations Line of Credit, 3rd Component of Senior Secured Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 70,000,000.0 |
Letter of credit facility outstanding amount | 30,000,000.0 | $ 30,000,000.0
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 30,000,000.0 |
Line of credit facility borrowings outstanding due period | 2024-06 |
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | LIBOR | Minimum |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 3.75% |
Mexican Railcar Manufacturing Operations Line of Credit 1, 3rd Component of Senior Secured Credit Facilities | LIBOR | Maximum |  |
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 |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 35,000,000.0 |
Joint venture partner each guaranteed percentage | 50.00% |
Line of credit facility borrowings outstanding due period | 2023-06 |
Mexican Railcar Manufacturing Operations Line of Credit 2, 3rd Component of Senior Secured Credit Facilities | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 3.70% |
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility maximum capacity | $ 5,000,000.0 |
Line of credit facility borrowings outstanding due period | 2022-09 |
Mexican Railcar Manufacturing Operations Line of Credit 3, 3rd Component of Senior Secured Credit Facilities | LIBOR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 2.95% |

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