v3.26.1
Stockholders' equity - Narrative (Details) - $ / shares
 3 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Jan. 31, 2026
Mar. 31, 2025
Jul. 22, 2019
Class of Stock [Line Items]          
Common stock, authorized (in shares) 500,000,000   500,000,000   500,000,000
Common stock, par value per share (in dollars per share) $ 0.01   $ 0.01   $ 0.01
Shares withheld for tax withholding obligation (in shares) 0        
Stock Repurchase Program          
Class of Stock [Line Items]          
Repurchase of outstanding common stock, shares authorized (in shares)       2,500,000  
Shares repurchased (in shares) 0 0