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v3.23.2

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2023 | May 31, 2022 | May 31, 2023 | May 31, 2022
Related Party Transaction [Line Items] |  |  |  |
Percentage of recognized revenue and margin from sale |  |  | 60.00% |
Percentage of deferred revenue and margin from sale |  |  | 40.00% |
Leasing Warehouse |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenue recognize from railcars sold | $ 15.1 |  | $ 15.1 |
Axis LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in entity | 41.90% |  | 41.90% |
Axis LLC | Railcar Components |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Purchases of goods from related party | $ 2.2 | $ 3.5 | $ 6.7 | $ 9.7
Greenbrier |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in entity | 40.00% |  | 40.00% |

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