SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2020 USD ($)	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2020 USD ($) item	Jan. 31, 2019 USD ($)	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)
Segment Reporting Information
Operating segment | item									1
Revenues	$ 67,988	$ 58,406	$ 63,059	$ 49,544	$ 87,658	$ 116,459	$ 136,670	$ 141,366	$ 238,997	$ 482,153	$ 892,815
Cost of revenues									245,817	399,715	743,490
Gross (loss) profit	5,249	5,992	2,965	(21,026)	6,746	29,532	30,708	15,452	(6,820)	82,438	149,325
Selling, general and administrative expenses									44,125	40,710	41,764
Impairment loss									4,895	1,491	584
Income (loss) from operations	(9,938)	$ (6,143)	$ (7,073)	$ (32,686)	(4,293)	$ 18,385	$ 20,330	$ 5,815	(55,840)	40,237	106,977
Other income, net									8,075	6,981	5,648
Income (loss) before income taxes									(47,765)	47,218	112,625
Income tax benefit									7,053	4,651	(40,279)
Net (loss) income									(40,712)	51,869	72,346
Depreciation									3,513	3,422	2,779
Amortization of intangibles									1,136	1,012	1,032
Property, plant and equipment additions									7,058	8,599	4,826
Current assets	421,755				416,348				421,755	416,348
Current liabilities	144,034				81,316				144,034	81,316
Goodwill	27,943				32,838				27,943	32,838	34,329	$ 34,913
Total assets	487,540				476,648				487,540	476,648	542,669
Other
Segment Reporting Information
Selling, general and administrative expenses									7,345	7,277	9,612
Income (loss) from operations									(7,345)	(7,277)	(9,612)
Other income, net									540	461	257
Income (loss) before income taxes									(6,805)	(6,816)	(9,355)
Depreciation									5	14	13
Property, plant and equipment additions									11	3	2
Current assets	76,794				66,071				76,794	66,071
Current liabilities	1,279				968				1,279	968
Total assets	84,636				67,019				84,636	67,019	60,015
Intercompany Eliminations
Segment Reporting Information
Revenues									3,300	800	2,200
Power Services
Segment Reporting Information
Revenues									135,729	367,812	814,544
Cost of revenues									152,854	297,931	675,362
Gross (loss) profit									(17,125)	69,881	139,182
Selling, general and administrative expenses									26,835	23,741	23,356
Impairment loss									2,072
Income (loss) from operations									(46,032)	46,140	115,826
Other income, net									7,535	5,120	5,391
Income (loss) before income taxes									(38,497)	51,260	121,217
Depreciation									694	749	885
Amortization of intangibles									291	350	350
Property, plant and equipment additions									5,069	3,156	1,362
Current assets	320,257				317,708				320,257	317,708
Current liabilities	135,518				66,085				135,518	66,085
Goodwill	18,476				20,548				18,476	20,548	20,548
Total assets	352,034				347,189				352,034	347,189	432,932
Industrial Services
Segment Reporting Information
Revenues									94,682	101,673	65,303
Cost of revenues									85,859	92,097	58,283
Gross (loss) profit									8,823	9,576	7,020
Selling, general and administrative expenses									7,810	7,904	7,401
Impairment loss									2,823	1,491	584
Income (loss) from operations									(1,810)	181	(965)
Other income, net										1,400
Income (loss) before income taxes									(1,810)	1,581	(965)
Depreciation									2,418	2,293	1,607
Amortization of intangibles									664	662	682
Property, plant and equipment additions									1,638	4,750	2,837
Current assets	21,766				28,878				21,766	28,878
Current liabilities	6,441				13,384				6,441	13,384
Goodwill	9,467				12,290				9,467	12,290	13,781
Total assets	46,321				57,168				46,321	57,168	44,849
Telecom Services
Segment Reporting Information
Revenues									8,586	12,668	12,968
Cost of revenues									7,104	9,687	9,845
Gross (loss) profit									1,482	2,981	3,123
Selling, general and administrative expenses									2,135	1,788	1,395
Income (loss) from operations									(653)	1,193	1,728
Income (loss) before income taxes									(653)	1,193	1,728
Depreciation									396	366	274
Amortization of intangibles									181
Property, plant and equipment additions									340	690	625
Current assets	2,938				3,691				2,938	3,691
Current liabilities	796				879				796	879
Total assets	$ 4,549				$ 5,272				$ 4,549	$ 5,272	$ 4,873