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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2024	Aug. 31, 2023	Aug. 31, 2022
Related Party Transaction [Line Items]
Percentage of recognized revenue and margin from sale	60.00%
Percentage of deferred revenue and margin from sale	40.00%
Axis LLC
Related Party Transaction [Line Items]
Percentage of ownership in entity	41.90%
Greenbrier
Related Party Transaction [Line Items]
Percentage of ownership in entity	40.00%
Leasing Warehouse
Related Party Transaction [Line Items]
Revenue recognized with railcars sold out of leasing warehouse		$ 15.1	$ 9.3
Railcar Components | Axis LLC
Related Party Transaction [Line Items]
Purchases of goods from related party	$ 8.8	$ 8.7	$ 11.5

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- Definition

Percentage of deferred revenue and margin from sale.

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Percentage of recognized revenue and margin from sale.

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- Definition

Revenue recognized with railcars sold out of leasing warehouse.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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