Derivative financial instruments and hedging activities - Schedule of Fair Value of Derivative Contracts (Details) - Treasury bond forwards - USD ($) $ in Thousands |
Jul. 31, 2026 |
Jan. 31, 2026 |
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| Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liabilities | $ (37,874) | $ (6,935) |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative assets | 0 | 3,285 |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative liabilities | (47,324) | (7,997) |
| Location, Statement of Financial Position, Balance [Axis]: us-gaap:PrepaidExpenseAndOtherAssetsCurrent | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative assets | $ 0 | $ 0 |
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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