v3.26.3
Revenue Recognition - Summary of Revenue Disaggregated by Categories (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Aug. 31, 2024
Disaggregation of Revenue [Line Items]      
Revenue $ 2,461.1 $ 3,240.2 $ 3,544.7
Manufacturing      
Disaggregation of Revenue [Line Items]      
Revenue 2,266.5 3,046.9 3,371.2
Leasing & Fleet Management      
Disaggregation of Revenue [Line Items]      
Revenue 194.6 193.3 173.5
Railcar Sales | Manufacturing      
Disaggregation of Revenue [Line Items]      
Revenue 1,908.5 2,662.3 3,011.5
Railcar Maintenance | Manufacturing      
Disaggregation of Revenue [Line Items]      
Revenue $ 358.0 $ 384.6 $ 359.7