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Net Income (Loss) per Share Attributable to Common Stockholders - Earnings (Loss) Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Oct. 31, 2025
Oct. 31, 2024
Numerator:        
Net income (loss) attributable to common stockholders $ 76.5 $ (18.9) $ 24.0 $ (56.5)
Denominator:        
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic (in shares) 5,586,257 4,017,222 4,669,517 3,925,414
Dilutive effect of options, warrants and RSUs (in shares) 16,314 0 32,590 0
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted (in shares) 5,602,571 4,017,222 4,702,107 3,925,414
Net income (loss) per share attributable to common stockholders, basic (in usd per share) $ 13.69 $ (4.70) $ 5.14 $ (14.39)
Net income (loss) per share attributable to common stockholders, diluted (in usd per share) $ 13.65 $ (4.70) $ 5.10 $ (14.39)