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Acquisitions - Additional Information (Detail) $ in Thousands		12 Months Ended
	Jul. 26, 2019 USD ($) Railcar	Aug. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	Aug. 31, 2019 USD ($)
Business Acquisition [Line Items]
Revenue		$ 1,747,981	$ 2,792,189	$ 3,033,591
Loss from operations		40,970	168,429	184,116
Manufacturing
Business Acquisition [Line Items]
Revenue		1,329,987	2,349,971	2,431,499
Loss from operations		67,124	$ 197,388	217,583
American Railcar Industries
Business Acquisition [Line Items]
Business combination estimated gross purchase price	$ 417,200
Number of railcar manufacturing facilities acquired | Railcar	2
Business combination consideration transferred for capital expenditures	$ 8,500
American Railcar Industries | 2024 Convertible Senior Notes
Business Acquisition [Line Items]
Convertible senior notes		50,000
Senior term debt		$ 300,000
American Railcar Industries | Manufacturing
Business Acquisition [Line Items]
Revenue				43,000
Loss from operations				$ 1,600

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