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PURCHASED INTANGIBLE ASSETS - Goodwill and Finite Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Jan. 31, 2016
Finite-Lived Intangible Assets            
Goodwill $ 34,780 $ 34,780 $ 22,887 $ 34,780 $ 22,887 $ 37,405
Impairment loss   1,979   1,979    
Accumulated amortization $ 3,116 3,116   3,116    
APC            
Finite-Lived Intangible Assets            
Impairment loss   2,000 $ 0 2,000 $ 0  
APC | Minimum            
Finite-Lived Intangible Assets            
Percentage of contract backlog suspended 90.00%          
TRC            
Finite-Lived Intangible Assets            
Goodwill $ 14,300 14,300   14,300    
GPS            
Finite-Lived Intangible Assets            
Goodwill 18,500 18,500   18,500    
APC            
Finite-Lived Intangible Assets            
Goodwill 2,000 2,000   $ 2,000    
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 3,643   $ 3,643    
Accumulated amortization 2,343 2,343   2,343    
Finite Lived Intangible Assets - Net Amount 1,300 1,300   $ 1,300   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 1,897   $ 1,897    
Accumulated amortization 181 181   181    
Finite Lived Intangible Assets - Net Amount 1,716 1,716   $ 1,716   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 916 916   $ 916    
Accumulated amortization 61 61   61    
Finite Lived Intangible Assets - Net Amount 855 855   $ 855   901
Customer Relationships | APC            
Finite-Lived Intangible Assets            
Finite-Lived Intangible Assets - Estimated Useful Life       4 years    
Finite Lived Intangible Assets - Gross Carrying Amount 430 430   $ 430    
Accumulated amortization 274 274   274    
Finite Lived Intangible Assets - Net Amount 156 156   156   371
Other intangibles            
Finite-Lived Intangible Assets            
Finite Lived Intangible Assets - Gross Carrying Amount 288 288   288    
Accumulated amortization 257 257   257    
Finite Lived Intangible Assets - Net Amount $ 31 $ 31   $ 31   $ 119