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INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
INCOME TAXES |  |  |
Computed expected income tax expense | $ (9,916) | $ (38,078) | $ (40,086)
Federal research and development tax credits | 13,866 |  |
State income taxes, net of federal tax effect | 683 | (5,042) | (4,001)
Net operating loss carryforwards | 1,730 |  |
Stock options | 32 | 962 | 4,969
Domestic production activities deduction |  | 3,204 | 2,906
Other permanent differences, net | (1,585) | (1,141) | 551
Impact of the federal tax rate change on deferred taxes |  | 789 |
Adjustments and other differences | (159) | (973) | (1,445)
Income tax benefit (expense) | 4,651 | (40,279) | $ (37,106)
Research and development state tax credit | 2,800 |  |
Income tax refunds and prepaid income taxes | 19,500 |  |
Prepaid income taxes |  | $ 7,900 |
Income tax benefit recorded related to additional net operating losses of acquired companies | $ 1,700 |  |

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