XML 57 R44.htm IDEA: XBRL DOCUMENT v3.22.1

Revenue Recognition - Additional information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Feb. 28, 2022 USD ($)	Feb. 28, 2022 USD ($)
Revenue From Contract With Customers [Line Items]
Revenue recognized from contract with customers liability	$ 3.8	$ 13.4
Railcar sales
Revenue From Contract With Customers [Line Items]
Expected revenue recognized in the reminder of fiscal year	1,000.0	1,000.0
Management services
Revenue From Contract With Customers [Line Items]
Expected revenue recognized in the reminder of fiscal year	$ 129.8	$ 129.8
Expected performance percentage	52.00%	52.00%

X

- Definition

Revenue From Contract With Customers [Line Items]

+ References

No definition available.

+ Details

Name:	gbx_RevenueFromContractWithCustomersLineItems
Namespace Prefix:	gbx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045

+ Details

Name:	us-gaap_RevenueRemainingPerformanceObligationPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=gbx_RailCarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=gbx_ManagementServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: