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Acquisitions - Unaudited Pro Forma Financial Information (Detail) - American Railcar Industries
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 31, 2019
USD ($)
$ / shares
Business Acquisition [Line Items]  
Revenue | $ $ 3,462,255
Net earnings attributable to Greenbrier | $ $ 57,284
Basic earnings per common share | $ / shares $ 1.76
Diluted earnings per common share | $ / shares $ 1.73