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Consolidating Statement of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Condensed Statement of Income Captions [Line Items]    
Net earnings (loss) $ 35,982us-gaap_ProfitLoss $ 22,997us-gaap_ProfitLoss
Other comprehensive income (loss)    
Translation adjustment (3,450)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 2,512us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Reclassification of derivative financial instruments recognized in net earnings (loss) 289us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1] 137us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax [1]
Unrealized gain (loss) on derivative financial instruments (306)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [2] 762us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax [2]
Other (net of tax effect) (2)us-gaap_OtherComprehensiveIncomeOtherNetOfTax (1)us-gaap_OtherComprehensiveIncomeOtherNetOfTax
Other comprehensive income (loss) (3,469)us-gaap_OtherComprehensiveIncomeLossNetOfTax 3,410us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) 32,513us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 26,407us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive (income) loss attributable to noncontrolling interest (3,148)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest (7,650)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income (loss) attributable to Greenbrier 29,365us-gaap_ComprehensiveIncomeNetOfTax 18,757us-gaap_ComprehensiveIncomeNetOfTax
Parent    
Condensed Statement of Income Captions [Line Items]    
Net earnings (loss) 32,786us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 15,388us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other comprehensive income (loss)    
Comprehensive income (loss) 32,786us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 15,388us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Comprehensive income (loss) attributable to Greenbrier 32,786us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 15,388us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Combined Guarantor Subsidiaries    
Condensed Statement of Income Captions [Line Items]    
Net earnings (loss) 38,500us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember		 15,061us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other comprehensive income (loss)    
Translation adjustment   45us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Reclassification of derivative financial instruments recognized in net earnings (loss) 283us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember		 259us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Unrealized gain (loss) on derivative financial instruments (831)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember		 1us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other comprehensive income (loss) (548)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember		 305us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Comprehensive income (loss) 37,952us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember		 15,366us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Comprehensive income (loss) attributable to Greenbrier 37,952us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember		 15,366us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Combined Non-Guarantor Subsidiaries    
Condensed Statement of Income Captions [Line Items]    
Net earnings (loss) 38,534us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 16,759us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive income (loss)    
Translation adjustment (3,450)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 2,467us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Reclassification of derivative financial instruments recognized in net earnings (loss) 6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 (122)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Unrealized gain (loss) on derivative financial instruments 525us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 761us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other (net of tax effect) (2)us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 (1)us-gaap_OtherComprehensiveIncomeOtherNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other comprehensive income (loss) (2,921)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 3,105us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income (loss) 35,613us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 19,864us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Comprehensive (income) loss attributable to noncontrolling interest (16,100)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 (7,304)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income (loss) attributable to Greenbrier 19,513us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember		 12,560us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Eliminations    
Condensed Statement of Income Captions [Line Items]    
Net earnings (loss) (73,838)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember		 (24,211)us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Other comprehensive income (loss)    
Comprehensive income (loss) (73,838)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember		 (24,211)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Comprehensive (income) loss attributable to noncontrolling interest 12,952us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember		 (346)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Comprehensive income (loss) attributable to Greenbrier $ (60,886)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember		 $ (24,557)us-gaap_ComprehensiveIncomeNetOfTax
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
[1] Net of tax effect of $0.2 million and $0.1 million for the three months ended November 30, 2014 and 2013.
[2] Net of tax effect of $0.4 million and $0.2 million for the three months ended November 30, 2014 and 2013.