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INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Jan. 31, 2018
INCOME TAXES          
Computed expected income tax expense     $ (10,427) $ (36,062)  
State income taxes, net of federal tax effect     676 (4,633)  
Federal research and development tax credits     13,866    
Net operating loss benefits     1,730    
Stock options     14 866  
Domestic production activities deduction       3,036  
Adjustments and other differences     (1,350) (945)  
Income tax benefit (expense) $ 12,560 $ (12,062) 4,509 (37,738)  
research and development state tax credit       2,700  
Foreign income tax expense       $ 500  
Partial income tax refunds offset 16,500   16,500    
Accrued income taxes 1,500   $ 1,500    
Prepaid income taxes         $ 7,900
Income tax benefit recorded related to additional net operating losses of acquired companies $ 1,700