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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Jan. 31, 2017
Segment Reporting Information          
Revenues $ 259,803 $ 162,495 $ 490,292 $ 292,843  
Cost of revenues 208,396 118,483 398,789 220,529  
GROSS PROFIT 51,407 44,012 91,503 72,314  
Selling, general and administrative expenses 10,799 7,534 20,289 14,581  
Impairment loss   1,979   1,979  
INCOME FROM OPERATIONS 40,608 34,499 71,214 55,754  
Other income, net 1,311 556 2,529 593  
INCOME BEFORE INCOME TAXES 41,919 35,055 73,743 56,347  
Income tax expense 14,601 11,756 25,676 18,928  
NET INCOME 27,318 23,299 48,067 37,419  
Amortization of purchased intangible assets 334 200 518 521  
Depreciation 638 484 1,210 918  
Property, plant and equipment additions 939 1,635 2,802 1,612  
Current assets 642,627 423,914 642,627 423,914 $ 587,949
Current liabilities 354,698 223,699 354,698 223,699 350,724
Goodwill 34,913 34,780 34,913 34,780 34,913
Total assets 700,972 481,094 700,972 481,094 $ 644,488
Power Services          
Segment Reporting Information          
Revenues 238,850 143,422 449,639 251,521  
Cost of revenues 189,266 100,035 362,515 183,733  
GROSS PROFIT 49,584 43,387 87,124 67,788  
Selling, general and administrative expenses 6,135 4,065 11,340 7,298  
Impairment loss   1,979   1,979  
INCOME FROM OPERATIONS 43,449 37,343 75,784 58,511  
Other income, net 1,250 525 2,420 538  
INCOME BEFORE INCOME TAXES 44,699 37,868 78,204 59,049  
Amortization of purchased intangible assets 88 104 175 251  
Depreciation 184 160 354 289  
Property, plant and equipment additions 203 788 215 840  
Current assets 548,115 303,789 548,115 303,789  
Current liabilities 342,569 207,634 342,569 207,634  
Goodwill 20,548 20,548 20,548 20,548  
Total assets 575,617 326,789 575,617 326,789  
Industrial Services          
Segment Reporting Information          
Revenues 17,058 17,327 33,629 37,737  
Cost of revenues 16,096 17,117 30,837 34,105  
GROSS PROFIT 962 210 2,792 3,632  
Selling, general and administrative expenses 1,758 1,487 3,404 3,121  
INCOME FROM OPERATIONS (796) (1,277) (612) 511  
INCOME BEFORE INCOME TAXES (796) (1,277) (612) 511  
Amortization of purchased intangible assets 246 96 343 270  
Depreciation 384 278 719 539  
Property, plant and equipment additions 643 703 2,337 602  
Current assets 18,003 21,003 18,003 21,003  
Current liabilities 10,131 13,206 10,131 13,206  
Goodwill 14,365 14,232 14,365 14,232  
Total assets 47,490 52,130 47,490 52,130  
Telecom Services          
Segment Reporting Information          
Revenues 3,895 1,746 7,024 3,585  
Cost of revenues 3,034 1,331 5,437 2,691  
GROSS PROFIT 861 415 1,587 894  
Selling, general and administrative expenses 398 301 711 628  
INCOME FROM OPERATIONS 463 114 876 266  
INCOME BEFORE INCOME TAXES 463 114 876 266  
Depreciation 67 43 131 84  
Property, plant and equipment additions 93 142 248 168  
Current assets 3,158 5,379 3,158 5,379  
Current liabilities 1,261 687 1,261 687  
Total assets 4,197 5,840 4,197 5,840  
Other          
Segment Reporting Information          
Selling, general and administrative expenses 2,508 1,681 4,834 3,534  
INCOME FROM OPERATIONS (2,508) (1,681) (4,834) (3,534)  
Other income, net 61 31 109 55  
INCOME BEFORE INCOME TAXES (2,447) (1,650) (4,725) (3,479)  
Depreciation 3 3 6 6  
Property, plant and equipment additions   2 2 2  
Current assets 73,351 93,743 73,351 93,743  
Current liabilities 737 2,172 737 2,172  
Total assets 73,668 $ 96,335 73,668 $ 96,335  
Intercompany Eliminations          
Segment Reporting Information          
Revenues $ 100   $ 1,600