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Debt and Financing Arrangements - Interest Expense (Details) - Convertible Senior Notes - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 30, 2026 | Apr. 30, 2025
Debt Instrument [Line Items] |  |
Contractual interest expense | $ 1,512 | $ 1,687
Amortization of debt issuance costs | 595 | 677
Total interest expense related to the 2025 Notes and the 2028 Notes | $ 2,107 | $ 2,364

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