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Acquisitions - Preliminary Allocation of Purchase Price Based on Fair Value of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
Feb. 29, 2020
Aug. 31, 2019
Business Acquisition [Line Items]    
Intangibles and other assets, net $ 36,431  
Goodwill 129,684 $ 129,947
American Railcar Industries    
Business Acquisition [Line Items]    
Accounts receivable, net 27,659  
Inventories 98,053  
Property, plant and equipment, net 225,045  
Investments in unconsolidated affiliates 40,314  
Intangibles and other assets, net 36,785  
Goodwill 56,514  
Total assets acquired 484,370  
Total liabilities assumed 67,174  
Net assets acquired $ 417,196