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Lease Commitments - Aggregate Minimum Future Amounts Payable Under Non-Cancelable Operating Leases (Detail) - Domestic railcar repair facilities, office space and certain manufacturing and office equipment
$ in Thousands
Aug. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 6,048
2020 4,437
2021 3,286
2022 1,915
2023 1,862
Thereafter 196
Operating Leases, Future Minimum Payments Due, Total $ 17,744