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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Jan. 31, 2016
Segment Reporting Information          
Revenues $ 162,495 $ 97,434 $ 292,843 $ 182,921  
Cost of revenues 118,483 68,941 220,529 133,261  
Gross profit 44,012 28,493 72,314 49,660  
Impairment loss 1,979   1,979    
Selling, general and administrative expenses 7,534 4,848 14,581 10,387  
Income (loss) from operations 34,499 23,645 55,754 39,273  
Other income, net 556 128 593 212  
Income (loss) before income taxes 35,055 23,773 56,347 39,485  
Income tax expense 11,756 7,939 18,928 12,800  
Net income 23,299 15,834 37,419 26,685  
Amortization of intangibles 200 104 521 164  
Depreciation 484 140 918 258  
Property, plant and equipment additions 1,635 1,297 1,612 2,503  
Current assets 423,914   423,914   $ 350,612
Current liabilities 223,699   223,699   187,712
Goodwill 34,780 22,887 34,780 22,887 37,405
Total assets 481,094 380,058 481,094 380,058 $ 409,791
Power Industry Services          
Segment Reporting Information          
Revenues 143,422 93,471 251,521 176,355  
Cost of revenues 100,035 66,136 183,733 128,515  
Gross profit 43,387 27,335 67,788 47,840  
Impairment loss 1,979   1,979    
Selling, general and administrative expenses 4,065 2,849 7,298 6,432  
Income (loss) from operations 37,343 24,486 58,511 41,408  
Other income, net 525 301 538 379  
Income (loss) before income taxes 37,868 24,787 59,049 41,787  
Amortization of intangibles 104 104 251 164  
Depreciation 160 95 289 170  
Property, plant and equipment additions 788 1,285 840 2,410  
Current assets 303,789   303,789    
Current liabilities 207,634   207,634    
Goodwill 20,548 22,887 20,548 22,887  
Total assets 326,789 310,410 326,789 310,410  
Telecommunications Infrastructure Services          
Segment Reporting Information          
Revenues 1,746 3,963 3,585 6,566  
Cost of revenues 1,331 2,805 2,691 4,746  
Gross profit 415 1,158 894 1,820  
Selling, general and administrative expenses 301 415 628 718  
Income (loss) from operations 114 743 266 1,102  
Income (loss) before income taxes 114 743 266 1,102  
Depreciation 43 42 84 82  
Property, plant and equipment additions 142 10 168 91  
Current assets 5,379   5,379    
Current liabilities 687   687    
Total assets 5,840 2,910 5,840 2,910  
Industrial Fabrication And Field Services          
Segment Reporting Information          
Revenues 17,327   37,737    
Cost of revenues 17,117   34,105    
Gross profit 210   3,632    
Selling, general and administrative expenses 1,487   3,121    
Income (loss) from operations (1,277)   511    
Income (loss) before income taxes (1,277)   511    
Amortization of intangibles 96   270    
Depreciation 278   539    
Property, plant and equipment additions 703   602    
Current assets 21,003   21,003    
Current liabilities 13,206   13,206    
Goodwill 14,232   14,232    
Total assets 52,130   52,130    
Other          
Segment Reporting Information          
Selling, general and administrative expenses 1,681 1,584 3,534 3,237  
Income (loss) from operations (1,681) (1,584) (3,534) (3,237)  
Other income, net 31 (173) 55 (167)  
Income (loss) before income taxes (1,650) (1,757) (3,479) (3,404)  
Depreciation 3 3 6 6  
Property, plant and equipment additions 2 2 2 2  
Current assets 93,743   93,743    
Current liabilities 2,172   2,172    
Total assets $ 96,335 $ 66,738 $ 96,335 $ 66,738