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RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2016 | Jul. 31, 2015 | Jan. 31, 2016
Recently issued accounting pronouncements |  |  |  |  |
Income tax expense (benefit) | $ 11,756 | $ 7,939 | $ 18,928 | $ 12,800 |
Deferred income tax liabilities, noncurrent |  |  |  |  | $ 224
Accounting Standards Update ('ASU') 2016-09 - Reduction in income tax expense: Improvements to Employee Share-Based Payment Accounting | Adjustment |  |  |  |  |
Recently issued accounting pronouncements |  |  |  |  |
Income tax expense (benefit) | $ (1,000) |  | $ (1,100) |  |
Accounting Standards Update ("ASU") 2015-17 - Income Taxes: Balance Sheet Classification of Deferred Taxes | Retrospective early adoption |  |  |  |  |
Recently issued accounting pronouncements |  |  |  |  |
Deferred income tax liabilities, noncurrent |  |  |  |  | (1,100)
Deferred tax assets, Current |  |  |  |  | $ (1,100)

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