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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Jan. 31, 2016
Segment Reporting Information          
Revenues $ 175,444 $ 113,967 $ 468,287 $ 296,888  
Cost of revenues 138,866 87,705 359,395 220,966  
Gross profit 36,578 26,262 108,892 75,922  
Impairment loss     1,979    
Selling, general and administrative expenses 9,848 5,590 24,429 15,977  
Income (loss) from operations 26,730 20,672 82,484 59,945  
Other income, net 690 732 1,283 944  
Income (loss) before income taxes 27,420 21,404 83,767 60,889  
Income tax expense 8,194 7,045 27,122 19,845  
Net income 19,226 14,359 56,645 41,044  
Amortization of intangibles 232 119 752 283  
Depreciation 525 186 1,444 444  
Property, plant and equipment additions 868 158 2,526 2,671  
Current assets 499,970   499,970   $ 350,612
Current liabilities 290,533   290,533   187,712
Goodwill 34,913 22,525 34,913 22,525 37,405
Total assets 558,843 365,263 558,843 365,263 $ 409,791
Power Industry Services          
Segment Reporting Information          
Revenues 151,094 111,592 402,615 287,947  
Cost of revenues 118,407 86,103 302,140 214,618  
Gross profit 32,687 25,489 100,475 73,329  
Impairment loss     1,979    
Selling, general and administrative expenses 6,391 3,240 13,688 9,671  
Income (loss) from operations 26,296 22,249 84,808 63,658  
Other income, net 654 304 1,192 683  
Income (loss) before income taxes 26,950 22,553 86,000 64,341  
Amortization of intangibles 135 119 385 283  
Depreciation 169 143 459 312  
Property, plant and equipment additions 101 146 974 2,566  
Current assets 410,143   410,143    
Current liabilities 275,052   275,052    
Goodwill 20,548 22,525 20,548 22,525  
Total assets 435,208 288,988 435,208 288,988  
Telecommunications Infrastructure Services          
Segment Reporting Information          
Revenues 2,800 2,375 6,385 8,941  
Cost of revenues 2,073 1,602 4,764 6,348  
Gross profit 727 773 1,621 2,593  
Selling, general and administrative expenses 316 303 944 1,022  
Income (loss) from operations 411 470 677 1,571  
Income (loss) before income taxes 411 470 677 1,571  
Depreciation 51 40 135 123  
Property, plant and equipment additions 286 9 468 100  
Current assets 2,649   2,649    
Current liabilities 1,006   1,006    
Total assets 3,297 2,694 3,297 2,694  
Industrial Fabrication And Field Services          
Segment Reporting Information          
Revenues 21,550   59,287    
Cost of revenues 18,386   52,491    
Gross profit 3,164   6,796    
Selling, general and administrative expenses 1,410   4,532    
Income (loss) from operations 1,754   2,264    
Income (loss) before income taxes 1,754   2,264    
Amortization of intangibles 97   367    
Depreciation 302   841    
Property, plant and equipment additions 481   1,082    
Current assets 19,269   19,269    
Current liabilities 13,336   13,336    
Goodwill 14,365   14,365    
Total assets 50,363   50,363    
Other          
Segment Reporting Information          
Selling, general and administrative expenses 1,731 2,047 5,265 5,284  
Income (loss) from operations (1,731) (2,047) (5,265) (5,284)  
Other income, net 36 428 91 261  
Income (loss) before income taxes (1,695) (1,619) (5,174) (5,023)  
Depreciation 3 3 9 9  
Property, plant and equipment additions   3 2 5  
Current assets 67,909   67,909    
Current liabilities 1,139   1,139    
Total assets $ 69,975 $ 73,581 $ 69,975 $ 73,581