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Revenue Recognition - Summary of Revenue Disaggregated by Categories (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 3,240.2	$ 3,544.7	$ 3,944.0
Manufacturing
Disaggregation of Revenue [Line Items]
Revenue	2,991.2	3,312.4	3,764.1
Leasing & Fleet Management
Disaggregation of Revenue [Line Items]
Revenue	249.0	232.3	179.9
Railcar sales | Manufacturing
Disaggregation of Revenue [Line Items]
Revenue	2,606.6	2,952.7	3,341.4
Railcar maintenance | Manufacturing
Disaggregation of Revenue [Line Items]
Revenue	$ 384.6	$ 359.7	$ 422.7

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