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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2016
Jan. 31, 2016
Apr. 30, 2015
Finite-Lived Intangible Assets      
Goodwill $ 36,813 $ 37,405 $ 18,476
Accumulated amortization 2,831    
TRC      
Finite-Lived Intangible Assets      
Goodwill 14,300    
GPS      
Finite-Lived Intangible Assets      
Goodwill 18,500    
APC      
Finite-Lived Intangible Assets      
Goodwill $ 4,000    
Trade Name | GPS      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Assets - Estimated Useful Life 15 years    
Finite Lived Intangible Assets - Gross Carrying Amount $ 3,643    
Accumulated amortization 2,282    
Finite Lived Intangible Assets - Net Amount $ 1,361 1,421  
Process certifications | TRC      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Assets - Estimated Useful Life 7 years    
Finite Lived Intangible Assets - Gross Carrying Amount $ 1,897    
Accumulated amortization 113    
Finite Lived Intangible Assets - Net Amount $ 1,784 1,852  
Customer Relationships | TRC      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Assets - Estimated Useful Life 10 years    
Finite Lived Intangible Assets - Gross Carrying Amount $ 916    
Accumulated amortization 38    
Finite Lived Intangible Assets - Net Amount $ 878 901  
Customer Relationships | APC      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Assets - Estimated Useful Life 4 years    
Finite Lived Intangible Assets - Gross Carrying Amount $ 430    
Accumulated amortization 145    
Finite Lived Intangible Assets - Net Amount 285 371  
Other intangibles      
Finite-Lived Intangible Assets      
Finite Lived Intangible Assets - Gross Carrying Amount 288    
Accumulated amortization 253    
Finite Lived Intangible Assets - Net Amount $ 35 $ 119