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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.

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from hedging transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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