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SEGMENT REPORTING (Details)
$ in Thousands
 12 Months Ended
Jan. 31, 2021
USD ($)
item
Jan. 31, 2020
USD ($)
Jan. 31, 2019
USD ($)
Jan. 31, 2018
USD ($)
Segment Reporting Information        
Operating segment | item 1      
Revenues $ 392,206 $ 238,997 $ 482,153  
Cost of revenues 330,139 245,817 399,715  
Gross (loss) profit 62,067 (6,820) 82,438  
Selling, general and administrative expenses 39,041 44,125 40,710  
Impairment losses 0 4,895 1,491  
(Loss) income from operations 23,026 (55,840) 40,237  
Other income, net 1,859 8,075 6,981  
Income (loss) before income taxes 24,885 (47,765) 47,218  
Income tax (expense) benefits (Note 13) (1,074) 7,053 4,651  
Net income (loss) 23,811 (40,712) 51,869  
Amortization of intangibles 904 1,136 1,012  
Depreciation 3,715 3,513 3,422  
Property, plant and equipment additions 1,697 7,058 8,599  
Current assets 546,220 421,755 416,348  
Current liabilities 276,087 144,034 81,316  
Goodwill 27,943 27,943 32,838 $ 34,329
Total assets 602,630 487,540 476,648  
Other        
Segment Reporting Information        
Selling, general and administrative expenses 7,901 7,345 7,277  
(Loss) income from operations (7,901) (7,345) (7,277)  
Other income, net 82 540 461  
Income (loss) before income taxes (7,819) (6,805) (6,816)  
Depreciation 5 5 14  
Property, plant and equipment additions   11 3  
Current assets 161,695 76,794 66,071  
Current liabilities 985 1,279 968  
Total assets 162,212 84,636 67,019  
Intercompany Eliminations        
Segment Reporting Information        
Revenues 4,300 3,300 800  
Power Services        
Segment Reporting Information        
Revenues 319,353 135,729 367,812  
Cost of revenues 266,993 152,854 297,931  
Gross (loss) profit 52,360 (17,125) 69,881  
Selling, general and administrative expenses 21,795 26,835 23,741  
Impairment losses   2,072    
(Loss) income from operations 30,565 (46,032) 46,140  
Other income, net 1,777 7,535 5,120  
Income (loss) before income taxes 32,342 (38,497) 51,260  
Amortization of intangibles 242 291 350  
Depreciation 704 694 749  
Property, plant and equipment additions 1,043 5,069 3,156  
Current assets 360,552 320,257 317,708  
Current liabilities 261,030 135,518 66,085  
Goodwill 18,476 18,476 20,548  
Total assets 394,014 352,034 347,189  
Industrial Services        
Segment Reporting Information        
Revenues 65,263 94,682 101,673  
Cost of revenues 57,257 85,859 92,097  
Gross (loss) profit 8,006 8,823 9,576  
Selling, general and administrative expenses 7,358 7,810 7,904  
Impairment losses   2,823 1,491  
(Loss) income from operations 648 (1,810) 181  
Other income, net     1,400  
Income (loss) before income taxes 648 (1,810) 1,581  
Amortization of intangibles 662 664 662  
Depreciation 2,592 2,418 2,293  
Property, plant and equipment additions 338 1,638 4,750  
Current assets 22,014 21,766 28,878  
Current liabilities 13,119 6,441 13,384  
Goodwill 9,467 9,467 12,290  
Total assets 42,998 46,321 57,168  
Telecom Services        
Segment Reporting Information        
Revenues 7,590 8,586 12,668  
Cost of revenues 5,889 7,104 9,687  
Gross (loss) profit 1,701 1,482 2,981  
Selling, general and administrative expenses 1,987 2,135 1,788  
(Loss) income from operations (286) (653) 1,193  
Income (loss) before income taxes (286) (653) 1,193  
Amortization of intangibles   181    
Depreciation 414 396 366  
Property, plant and equipment additions 316 340 690  
Current assets 1,959 2,938 3,691  
Current liabilities 953 796 879  
Total assets $ 3,406 $ 4,549 $ 5,272