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STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION - BY LINE ITEM (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Stock-Based Compensation Plans        
Stock-based compensation expense $ 13,954 $ 16,424 $ 45,682 $ 50,257
Cost of revenue - product        
Stock-Based Compensation Plans        
Stock-based compensation expense 290 431 802 1,051
Cost of revenue - service and support        
Stock-Based Compensation Plans        
Stock-based compensation expense 1,517 1,761 4,771 4,023
Research and development, net        
Stock-Based Compensation Plans        
Stock-based compensation expense 2,585 2,583 7,193 6,445
Selling, general and administrative        
Stock-Based Compensation Plans        
Stock-based compensation expense $ 9,562 $ 11,649 $ 32,916 $ 38,738