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SEGMENT REPORTING (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Jul. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jan. 31, 2018
USD ($)
item
Jan. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
Segment Reporting Information                      
Operating segment | item                 1    
Revenues $ 169,578 $ 232,945 $ 259,803 $ 230,489 $ 206,760 $ 175,444 $ 162,495 $ 130,348 $ 892,815 $ 675,047 $ 413,275
Cost of revenues                 743,490 528,336 313,810
Gross profit 20,104 37,718 51,407 40,096 37,819 36,578 44,012 28,302 149,325 146,711 99,465
Selling, general and administrative expenses                 41,764 32,478 25,060
Impairment loss                 584 1,979  
Income (loss) from operations 8,163 27,599 40,608 30,607 29,770 26,730 34,499 21,255 106,977 112,254 74,405
Other income, net                 5,648 2,278 1,101
Income (loss) before income taxes                 112,625 114,532 75,506
Income tax expense                 40,279 37,106 25,302
Net income 7,050 $ 17,229 $ 27,318 $ 20,749 20,781 $ 19,226 $ 23,299 $ 14,120 72,346 77,426 50,204
Depreciation                 2,779 2,043 779
Amortization of intangibles                 1,032 1,163 531
Property, plant and equipment additions                 4,826 2,811 3,118
Current assets 545,751       587,949       545,751 587,949  
Current liabilities 243,986       350,724       243,986 350,724  
Goodwill 34,329       34,913       34,329 34,913 37,405
Total assets 603,393       644,488       603,393 644,488 409,791
Power Services                      
Segment Reporting Information                      
Revenues                 814,544 586,628 387,636
Cost of revenues                 675,362 452,599 290,823
Gross profit                 139,182 134,029 96,813
Selling, general and administrative expenses                 23,356 17,588 15,303
Impairment loss                   1,979  
Income (loss) from operations                 115,826 114,462 81,510
Other income, net                 5,391 2,145 827
Income (loss) before income taxes                 121,217 116,607 82,337
Depreciation                 885 665 433
Amortization of intangibles                 350 350 415
Property, plant and equipment additions                 1,362 1,005 2,985
Current assets 465,730               465,730    
Current liabilities 233,385               233,385    
Goodwill 20,548       20,548       20,548 20,548 22,525
Total assets 493,576       488,431       493,576 488,431 274,627
Industrial Services                      
Segment Reporting Information                      
Revenues                 65,303 78,994 15,260
Cost of revenues                 58,283 68,354 15,527
Gross profit                 7,020 10,640 (267)
Selling, general and administrative expenses                 7,401 6,264 1,151
Impairment loss                 584    
Income (loss) from operations                 (965) 4,376 (1,418)
Income (loss) before income taxes                 (965) 4,376 (1,418)
Depreciation                 1,607 1,165 172
Amortization of intangibles                 682 813 116
Property, plant and equipment additions                 2,837 1,238 28
Current assets 16,651               16,651    
Current liabilities 9,013               9,013    
Goodwill 13,781       14,365       13,781 14,365 14,880
Total assets 44,868       47,316       44,868 47,316 52,436
Telecom Services                      
Segment Reporting Information                      
Revenues                 12,968 9,425 10,379
Cost of revenues                 9,845 7,383 7,460
Gross profit                 3,123 2,042 2,919
Selling, general and administrative expenses                 1,395 1,430 1,323
Income (loss) from operations                 1,728 612 1,596
Income (loss) before income taxes                 1,728 612 1,596
Depreciation                 274 201 162
Property, plant and equipment additions                 625 563 100
Current assets 3,672               3,672    
Current liabilities 758               758    
Total assets 4,934       4,318       4,934 4,318 1,885
Other                      
Segment Reporting Information                      
Selling, general and administrative expenses                 9,612 7,196 7,283
Income (loss) from operations                 (9,612) (7,196) (7,283)
Other income, net                 257 133 274
Income (loss) before income taxes                 (9,355) (7,063) (7,009)
Depreciation                 13 12 12
Property, plant and equipment additions                 2 5 5
Current assets 59,698               59,698    
Current liabilities 830               830    
Total assets $ 60,015       $ 104,423       60,015 104,423 $ 80,843
Intercompany Eliminations                      
Segment Reporting Information                      
Revenues                 $ 2,200 $ 1,000