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INCOME TAXES - Reconciliation of Expected Income Tax Expense to Actual Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2017
Apr. 30, 2016
INCOME TAXES    
Computed expected income tax expense $ 11,139 $ 7,452
State income taxes, net of federal tax benefit 1,207 584
Stock option exercises (273)  
Domestic production activities deduction (793) (667)
Exclusion of non-controlling interests (43) (661)
Adjustments and other differences (161) 464
Income tax expense $ 11,076 $ 7,172