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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Finite-Lived Intangible Assets      
Percentage of contract backlog suspended   90.00%  
Intangible Assets - Gross Carrying Amount $ 11,612    
Accumulated Amortization 4,463    
Finite Lived Intangible Assets - Net Amount 6,968    
Other intangible assets, net 7,149 $ 8,181  
Additions to other intangible assets 0 0  
Additions to impairment losses 0 0  
Goodwill allocated for income tax reporting purposes $ 16,400    
Period of amortization of goodwill for income tax purpose 15 years    
Indefinite-Lived Intangible Assets      
Goodwill $ 34,329 34,913 $ 37,405
Impairment loss 584 1,979  
APC      
Indefinite-Lived Intangible Assets      
Impairment loss 0 2,000  
TRC      
Indefinite-Lived Intangible Assets      
Goodwill Impairment Loss 600    
GPS      
Indefinite-Lived Intangible Assets      
Goodwill 18,500    
TRC      
Indefinite-Lived Intangible Assets      
Goodwill 13,800    
APC      
Indefinite-Lived Intangible Assets      
Goodwill $ 2,000    
Trade names | GPS/TRC      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Assets - Estimated Useful Life 15 years    
Finite Lived Intangible Assets - Gross Carrying Amount $ 8,142    
Accumulated Amortization 3,357    
Finite Lived Intangible Assets - Net Amount $ 4,785 5,328  
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 587    
Finite Lived Intangible Assets - Net Amount 1,310 1,581  
Customer relationships | TRC/APC      
Finite-Lived Intangible Assets      
Finite Lived Intangible Assets - Gross Carrying Amount 1,346    
Accumulated Amortization 473    
Finite Lived Intangible Assets - Net Amount $ 873 1,072  
Customer relationships | TRC/APC | Maximum      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Assets - Estimated Useful Life 10 years    
Customer relationships | TRC/APC | Minimum      
Finite-Lived Intangible Assets      
Finite-Lived Intangible Assets - Estimated Useful Life 4 years    
Other intangibles      
Finite-Lived Intangible Assets      
Finite Lived Intangible Assets - Gross Carrying Amount $ 46    
Accumulated Amortization $ 46    
Finite Lived Intangible Assets - Net Amount   $ 19