v3.26.1
Derivative financial instruments and hedging activities - Narrative (Details) - Treasury bond forwards
$ in Millions
6 Months Ended
Jul. 31, 2026
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
Weighted average interest rate (as a percent) 3.93%
Cash flow hedge loss to be reclassified within 12 months $ 6.1