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Revenue Recognition - Additional information (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Revenue From Contract With Customers [Line Items]
Revenue recognized from contract with customers liability	$ 22.9	$ 13.0
Management services
Revenue From Contract With Customers [Line Items]
Expected performance percentage	61.00%

X

- Definition

Revenue From Contract With Customers [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	gbx_
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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

+ Details

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- Details

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