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INCOME TAXES - Components of Company's Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Current:      
Federal $ 32,490 $ 29,681 $ 16,458
State 7,853 6,188 5,423
Total 40,343 35,869 21,881
Deferred:      
Federal (2) 1,277 2,950
State (62) (40) 471
Total (64) 1,237 3,421
Income tax expense $ 40,279 $ 37,106 $ 25,302