v3.26.3
RELATED PARTY TRANSACTIONS - Schedule of Related Party Revenue and Purchases (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 4 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Related Party Transaction [Line Items]            
Related party revenue $ 839.0 $ 745.0 $ 2,442.0 $ 2,259.0 $ 3,281.0 $ 3,004.0
Related Party            
Related Party Transaction [Line Items]            
Related party revenue     11.0 39.0 16.0 51.0
Related party purchased transportation     $ 0.0 $ 2.0 $ 0.0 $ 3.0