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Net Income (Loss) per Common Share - Reconciliation between basic and diluted net income per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Earnings per share    
Net income (loss) (in dollars) $ 9,885 $ (10,391) [1]
Basic net income (loss) per share:    
Basic common shares 49,127 48,648 [1]
Basic net income (loss) per share (in dollars per share) $ 0.20 $ (0.21) [1]
Diluted net income (loss) per share:    
Basic common shares 49,127 48,648 [1]
Diluted restricted stock awards and stock options 1,010 0
Diluted common shares 50,137 48,648 [1]
Diluted net income (loss) per share (in dollars per share) $ 0.20 $ (0.21) [1]
[1] (As Adjusted)