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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Income Tax Disclosure [Abstract]          
Tax (benefit) provision $ (985) $ 229 [1] $ (1,216) $ 477 [1]  
Loss before income taxes $ 40,192 $ 25,803 [1] $ 66,385 $ 53,261 [1]  
Effective income tax rate 2.50% (0.90%) 1.80% (0.90%)  
Deferred tax asset as a result of deductible temporary difference $ 600   $ 600    
Reduction in deferred tax asset before valuation allowance due to change in tax rate         $ 61,000
[1] See Note 2 for a summary of adjustments.