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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2019	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Related Party Transaction [Line Items]
Carrying amount of investment in unconsolidated affiliates		$ 3,200	$ 3,600
Percentage of recognized revenue and margin from sale		60.00%
Percentage of deferred revenue and margin from sale		40.00%
Related party expenses		$ 200	300	$ 1,500
Dividends paid to joint venture partner		$ 25,292	38,969	$ 16,879
Amsted-Maxion Cruzeiro
Related Party Transaction [Line Items]
Percentage of ownership in entity	29.50%	29.50%		24.50%
Notes receivable conversion to equity	$ 4,800
Proceeds from notes receivable	$ 1,500
Additional equity method investment ownership percentage	5.00%
Note receivable			4,500
Greenbrier-Maxion
Related Party Transaction [Line Items]
Percentage of ownership in entity		60.00%
Note receivable			3,800
Axis LLC
Related Party Transaction [Line Items]
Percentage of ownership in entity		41.90%
Axis LLC | Railcar Components
Related Party Transaction [Line Items]
Purchases of goods from related party		$ 13,500	12,700	$ 1,600
Greenbrier
Related Party Transaction [Line Items]
Percentage of ownership in entity		40.00%
Joint Venture Agreement
Related Party Transaction [Line Items]
Dividends paid to joint venture partner			$ 22,500

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