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Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities (Detail) - USD ($)
$ in Thousands
Aug. 31, 2021
Aug. 31, 2020
Jul. 26, 2019
Business Acquisition [Line Items]      
Goodwill $ 132,110 $ 130,308  
American Railcar Industries      
Business Acquisition [Line Items]      
Accounts receivable     $ 27,659
Inventories     98,053
Property, plant and equipment     225,045
Investments in unconsolidated affiliates     40,314
Intangibles and other assets $ 36,431   36,785
Goodwill     56,659
Total assets acquired     484,515
Total liabilities assumed     67,319
Net assets acquired     $ 417,196