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Description of Business (Details)
railcar in Thousands, $ in Billions
9 Months Ended
May 29, 2025
USD ($)
railcar
locomotive
Sep. 30, 2025
Segment
Sep. 23, 2025
railcar
Jun. 30, 2025
USD ($)
Asset Acquisition [Line Items]        
Number of business segments | Segment   3    
Joint venture, ownership interest 30.00%      
Joint venture, potential ownership interest to acquire 100.00%      
Brookfield        
Asset Acquisition [Line Items]        
Joint venture, ownership interest 70.00%      
Joint Venture With Brookfield | Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument        
Asset Acquisition [Line Items]        
Derivative, notional amount | $       $ 2.4
Wells Fargo Bank, N.A. | Railcar Acquisition        
Asset Acquisition [Line Items]        
Number of assets acquired | railcar 105      
Asset acquisition, consideration transferred | $ $ 4.4      
Wells Fargo Bank, N.A. | Locomotive Acquisition        
Asset Acquisition [Line Items]        
Number of assets acquired | locomotive 223      
DB Cargo AG | Railcar Acquisition        
Asset Acquisition [Line Items]        
Number of assets acquired | railcar     6