Revolving Notes - Additional Information (Detail) - USD ($) | 6 Months Ended | |
Feb. 29, 2024 | Aug. 31, 2023 |
Line of Credit Facility [Line Items] | | |
Long-term line of credit | $ 300,800,000 | $ 297,100,000 |
Notional covering percentage of outstanding balance | 99% | |
European | | |
Line of Credit Facility [Line Items] | | |
Line of credit, guaranteed amount | $ 32,500,000 | |
Mexican | | |
Line of Credit Facility [Line Items] | | |
Line of credit facility maximum capacity | $ 96,000,000 | |
Minimum | European | | |
Line of Credit Facility [Line Items] | | |
Line of credit maturity date | 2024-06 | |
Minimum | Mexican | | |
Line of Credit Facility [Line Items] | | |
Line of credit facility borrowings outstanding due period | 2024-06 | |
Maximum | European | | |
Line of Credit Facility [Line Items] | | |
Line of credit maturity date | 2025-11 | |
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 | 1.20% | |
WIBOR | Maximum | European | | |
Line of Credit Facility [Line Items] | | |
Debt instrument, percentage points added to the reference rate | 1.60% | |
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] | | |
Line of credit facility maximum capacity | $ 1,400,000,000 | |
Letter of credit facility outstanding amount | 7,100,000 | 4,900,000 |
Senior Secured Credit Facilities | North American | | |
Line of Credit Facility [Line Items] | | |
Long-term line of credit | 55,000,000 | |
Senior Secured Credit Facilities | European | | |
Line of Credit Facility [Line Items] | | |
Long-term line of credit | 31,600,000 | 47,200,000 |
Senior Secured Credit Facilities | Mexican | | |
Line of Credit Facility [Line Items] | | |
Long-term line of credit | 125,000,000 | 110,000,000 |
Committed Credit Facilities | | |
Line of Credit Facility [Line Items] | | |
Aggregate amount available to draw down | 329,300,000 | |
Committed Credit Facilities | North American | | |
Line of Credit Facility [Line Items] | | |
Aggregate amount available to draw down | 214,600,000 | |
Committed Credit Facilities | European | | |
Line of Credit Facility [Line Items] | | |
Aggregate amount available to draw down | 43,700,000 | |
Committed Credit Facilities | Mexican | | |
Line of Credit Facility [Line Items] | | |
Aggregate amount available to draw down | 71,000,000 | |
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 | $ 75,300,000 | |
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 | 0.75% | |
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 | 1.75% | |
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 | $ 550,000,000 | |
Line of credit maturity date | 2027-08 | |
Long-term line of credit | $ 89,200,000 | $ 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 | $ 196,000,000 | |
Mexican Railcar Manufacturing Operations Line of Credit 1, 4 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, 4 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, 4 Component of Senior Secured Credit Facilities | Mexican | | |
Line of Credit Facility [Line Items] | | |
Joint venture partner each guaranteed percentage | 50% | |