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Leases - Supplemental Cash Flow Information Related to Leases (Detail) $ in Thousands	9 Months Ended
	May 31, 2021 USD ($)
Cash Flow Operating Activities Lessee [Abstract]
Operating cash flows from operating leases	$ 10,091
ROU assets obtained in exchange for new operating lease liabilities	404
ROU assets disposed of for lease terminations	$ (12,053)

X

- Definition

Right of use asset disposed of for lease terminations.

+ References

No definition available.

+ Details

Name:	gbx_RightOfUseAssetDisposedOfForLeaseTerminations
Namespace Prefix:	gbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Right of use asset obtained in exchange for operating lease liabilities.

+ References

No definition available.

+ Details

Name:	gbx_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilities
Namespace Prefix:	gbx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CashFlowOperatingActivitiesLesseeAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

+ Details

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