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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2019 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Related Party Transaction [Line Items] |  |  |  |
Carrying amount of investment in unconsolidated affiliates |  | $ 3,200 | $ 3,600 |
Percentage of recognized revenue and margin from sale |  | 60.00% |  |
Percentage of deferred revenue and margin from sale |  | 40.00% |  |
Related party expenses |  | $ 200 | 300 | $ 1,500
Dividends paid to joint venture partner |  | $ 25,292 | 38,969 | $ 16,879
Amsted-Maxion Cruzeiro |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in entity | 29.50% | 29.50% |  | 24.50%
Notes receivable conversion to equity | $ 4,800 |  |  |
Proceeds from notes receivable | $ 1,500 |  |  |
Additional equity method investment ownership percentage | 5.00% |  |  |
Note receivable |  |  | 4,500 |
Greenbrier-Maxion |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in entity |  | 60.00% |  |
Note receivable |  |  | 3,800 |
Axis LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in entity |  | 41.90% |  |
Axis LLC | Railcar Components |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchases of goods from related party |  | $ 13,500 | 12,700 | $ 1,600
Greenbrier |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in entity |  | 40.00% |  |
Joint Venture Agreement |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Dividends paid to joint venture partner |  |  | $ 22,500 |

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