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Revolving Notes - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Nov. 30, 2024 | Aug. 31, 2024
Line of Credit Facility [Line Items] |  |
Long-term line of credit | $ 444,900,000 | $ 351,600,000
European |  |
Line of Credit Facility [Line Items] |  |
Line of credit, guaranteed amount | 31,700,000 |
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 | 2025-06 |
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 | 1.40% |
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 | $ 1,300,000,000 |
Letter of credit facility outstanding amount | 6,600,000 | 5,900,000
Senior Secured Credit Facilities | North American |  |
Line of Credit Facility [Line Items] |  |
Long-term line of credit | 120,000,000 | 0
Senior Secured Credit Facilities | European |  |
Line of Credit Facility [Line Items] |  |
Long-term line of credit | 56,300,000 | 46,700,000
Senior Secured Credit Facilities | Mexican |  |
Line of Credit Facility [Line Items] |  |
Long-term line of credit | 75,000,000 | 110,000,000
Committed Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Aggregate amount available to draw down | 248,700,000 |
Committed Credit Facilities | North American |  |
Line of Credit Facility [Line Items] |  |
Aggregate amount available to draw down | 139,500,000 |
Committed Credit Facilities | European |  |
Line of Credit Facility [Line Items] |  |
Aggregate amount available to draw down | 18,200,000 |
Committed Credit Facilities | Mexican |  |
Line of Credit Facility [Line Items] |  |
Aggregate amount available to draw down | 91,000,000 |
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 | $ 74,500,000 |
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 |
Line of credit maturity date | 2029-09 |
Long-term line of credit | $ 193,600,000 | $ 194,900,000
Notional covering percentage of outstanding balance | 85.00% |
GBX Leasing | SOFR |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, percentage points added to the reference rate | 1.70% |
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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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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