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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Sep. 01, 2021 | Sep. 01, 2020 | Nov. 30, 2019 | Sep. 01, 2019 | Sep. 01, 2018 | Aug. 31, 2018 | Aug. 02, 2018 | Jun. 01, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net foreign currency translation adjustment | $ 35,800,000 | $ 39,800,000 | $ 34,200,000 |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ 2,408,000 | 2,670,000 | 2,176,000 |  |  |  |  |  | $ 2,701,000 |  |
Property, Plant and Equipment useful life | 40 years |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets | $ 0 | 0 | 0 |  |  |  |  |  |  |  |
Research and development | 6,300,000 | 5,800,000 | 5,400,000 |  |  |  |  |  |  |  |
Stock based compensation expense | 14,704,000 | 8,997,000 | $ 11,153,000 |  |  |  |  |  |  |  |
Increase (decrease) to retained earnings | 881,740,000 | 885,460,000 |  |  |  |  |  |  |  |  |
Operating lease right of use asset | 39,819,000 | 62,389,000 |  |  |  |  |  |  |  |  |
Operating lease liability | 42,568,000 | 64,509,000 |  |  |  |  |  |  |  |  |
Decrease in Additional paid in capital | $ 469,721,000 | $ 460,400,000 |  |  |  |  |  |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Sep. 01, 2019 |  |  |  |  |  |  |  |  |  |
Operating lease right of use asset |  |  |  |  |  |  | $ 40,400,000 |  |  |  |
Operating lease liability |  |  |  |  |  |  | 41,600,000 |  |  |  |
Accounting Standards Update 2017-12 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Sep. 01, 2019 |  |  |  |  |  |  |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Sep. 01, 2020 |  |  |  |  |  |  |  |  |  |
Accounting Standards Update 2020-06 | Subsequent Events |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) to retained earnings |  |  |  | $ (3,000,000) |  |  |  |  |  |  |
Decrease in Additional paid in capital |  |  |  | (51,000,000) |  |  |  |  |  |  |
Derecognition of deferred tax liabilities |  |  |  | 17,000,000 |  |  |  |  |  |  |
Increase in convertible note due to due to separation of debt & equity |  |  |  | $ 71,000,000 |  |  |  |  |  |  |
Cumulative Effect Adjustment Due to Adoption | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) to retained earnings |  |  |  |  |  |  |  | $ 5,500,000 |  |  |
Cumulative Effect Adjustment Due to Adoption | Accounting Standards Update 2016-02 | Deferred Gains Recognised as Earnings |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) to retained earnings |  |  |  |  |  |  | $ 4,400,000 |  |  |  |
Cumulative Effect Adjustment Due to Adoption | ASU 2016-13 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) to retained earnings |  |  |  |  | $ (500,000) |  |  |  |  |  |
2.875% Convertible senior notes, due 2024 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.875% | 2.875% | 2.875% |  |  |  |  |  |  |  |
2.25% Convertible senior notes, due 2024 |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 2.25% | 2.25% | 2.25% |  |  |  |  |  |  |  |
Customer Relationships | Maximum |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives | 20 years |  |  |  |  |  |  |  |  |  |
GIMSA |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest in joint venture | 50.00% |  |  |  |  |  |  |  |  |  |
Greenbrier-Astra Rail |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  |  |  |  |  |  | 75.00%
Rayvag |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest in joint venture |  |  |  |  |  |  |  |  |  | 68.00% |
Greenbrier-Maxion |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in entity | 60.00% |  |  |  |  |  |  |  |  |  |
Amsted-Maxion Cruzeiro |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in entity | 29.50% |  | 24.50% |  |  | 29.50% |  |  |  |  |
Amsted-Maxion Cruzeiro | Greenbrier-Maxion |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in entity | 40.00% |  |  |  |  |  |  |  |  |  |
Greenbrier Railcar Funding I LLC |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in entity | 40.00% |  |  |  |  |  |  |  |  |  |
Axis LLC |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership in entity | 41.90% |  |  |  |  |  |  |  |  |  |

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