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INCOME TAXES - Components of Company's Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Current: |  |  |
Federal | $ 29,681 | $ 16,458 | $ 15,249
State | 6,188 | 5,423 | 4,767
Total | 35,869 | 21,881 | 20,016
Deferred: |  |  |
Federal | 1,277 | 2,950 | 788
State | (40) | 471 | 108
Total | 1,237 | 3,421 | 896
Income tax expense | $ 37,106 | $ 25,302 | $ 20,912

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