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SEGMENT REPORTING (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
Jan. 31, 2018
Segment Reporting Information          
Revenues $ 116,459 $ 232,945 $ 394,495 $ 723,237  
Cost of revenues 86,927 195,227 318,803 594,016  
Gross profit 29,532 37,718 75,692 129,221  
Selling, general and administrative expenses 11,147 10,119 31,162 30,408  
Income (loss) from operations 18,385 27,599 44,530 98,813  
Other income, net 1,429 1,692 5,121 4,221  
Income (loss) before income taxes 19,814 29,291 49,651 103,034  
Income tax benefit (expense) 12,560 (12,062) 4,509 (37,738)  
Net income 32,374 17,229 54,160 65,296  
Amortization of purchased intangible assets 253 258 759 776  
Depreciation 898 726 2,465 1,936  
Property, plant and equipment additions 2,001 1,204 7,366 4,006  
Current assets 439,492   439,492   $ 485,028
Current liabilities 99,876   99,876   183,211
Goodwill 34,329 34,913 34,329 34,913 34,329
Total assets 500,769 642,301 500,769 642,301 $ 542,670
Power Services          
Segment Reporting Information          
Revenues 88,724 212,493 316,262 662,131  
Cost of revenues 61,943 178,472 249,401 540,986  
Gross profit 26,781 34,021 66,861 121,145  
Selling, general and administrative expenses 7,178 5,464 18,563 16,804  
Income (loss) from operations 19,603 28,557 48,298 104,341  
Other income, net 1,298 1,623 3,393 4,043  
Income (loss) before income taxes 20,901 30,180 51,691 108,384  
Amortization of purchased intangible assets 87 87 262 262  
Depreciation 183 226 548 580  
Property, plant and equipment additions 776 476 2,318 691  
Current assets 347,883   347,883    
Current liabilities 82,381   82,381    
Goodwill 20,548 20,548 20,548 20,548  
Total assets 376,871 515,783 376,871 515,783  
Industrial Services          
Segment Reporting Information          
Revenues 24,091 16,574 68,577 50,203  
Cost of revenues 22,203 13,797 61,889 44,634  
Gross profit 1,888 2,777 6,688 5,569  
Selling, general and administrative expenses 1,910 1,638 5,698 5,041  
Income (loss) from operations (22) 1,139 990 528  
Other income, net     1,400    
Income (loss) before income taxes (22) 1,139 2,390 528  
Amortization of purchased intangible assets 166 171 497 514  
Depreciation 616 425 1,640 1,144  
Property, plant and equipment additions 1,104 463 4,379 2,800  
Current assets 30,519   30,519    
Current liabilities 15,670   15,670    
Goodwill 13,781 14,365 13,781 14,365  
Total assets 60,933 46,854 60,933 46,854  
Telecom Services          
Segment Reporting Information          
Revenues 3,644 3,878 9,656 10,903  
Cost of revenues 2,781 2,958 7,513 8,396  
Gross profit 863 920 2,143 2,507  
Selling, general and administrative expenses 436 452 1,286 1,163  
Income (loss) from operations 427 468 857 1,344  
Income (loss) before income taxes 427 468 857 1,344  
Depreciation 96 71 267 202  
Property, plant and equipment additions 119 265 666 513  
Current assets 3,964   3,964    
Current liabilities 1,075   1,075    
Total assets 5,623 5,242 5,623 5,242  
Other          
Segment Reporting Information          
Selling, general and administrative expenses 1,623 2,565 5,615 7,400  
Income (loss) from operations (1,623) (2,565) (5,615) (7,400)  
Other income, net 131 69 328 178  
Income (loss) before income taxes (1,492) (2,496) (5,287) (7,222)  
Depreciation 3 4 10 10  
Property, plant and equipment additions 2   3 2  
Current assets 57,126   57,126    
Current liabilities 750   750    
Total assets 57,342 74,422 57,342 74,422  
Intercompany Eliminations          
Segment Reporting Information          
Revenues $ 400 $ 200 $ 800 $ 1,800