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Subsequent Events - Additional Information (Detail) $ in Millions | Nov. 30, 2022 USD ($)
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GBX Leasing |
Subsequent Event [Line Items] |
Carrying value of noncontrolling interest | $ 8.3

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- Definition Carrying amount of the equity interests owned by noncontrolling shareholders, partners, or other equity holders in joint ventures included in the entity's consolidated financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI https://asc.fasb.org/extlink&oid=126929396&loc=SL4568740-111683 + Details
Name: | us-gaap_MinorityInterestInJointVentures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=gbx_GbxLeasingLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |