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Lease Commitments - Aggregate Minimum Future Amounts Payable Under Non-Cancelable Railcar Equipment Leases (Detail) - Railcar Equipment
$ in Thousands
Aug. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 6,287
2020 4,839
2021 1,821
2022 1,792
2023 1,792
Thereafter 1,810
Operating Leases, Future Minimum Payments Due $ 18,341