SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2019
Segment Reporting Information
Revenues	$ 58,406	$ 116,459	$ 171,009	$ 394,495
Cost of revenues	52,414	86,927	183,078	318,803
Gross profit	5,992	29,532	(12,069)	75,692
Selling, general and administrative expenses	12,135	11,147	31,761	31,162
Impairment loss			2,072
(Loss) income from operations	(6,143)	18,385	(45,902)	44,530
Other income, net	3,578	1,429	7,472	5,121
Income (loss) before income taxes	(2,565)	19,814	(38,430)	49,651
Income tax expense	(1,996)	12,560	4,936	4,509
Net (loss) income	(4,561)	32,374	(33,494)	54,160
Amortization of purchased intangible assets	272	253	864	759
Depreciation	899	898	2,610	2,465
Property, plant and equipment additions	3,265	2,001	6,308	7,366
Current assets	405,900	439,492	405,900	439,492	$ 416,348
Current liabilities	118,957	99,876	118,957	99,876	81,316
Goodwill	30,766	34,329	30,766	34,329	32,838
Total assets	472,717	500,769	472,717	500,769	$ 476,648
Power Services
Segment Reporting Information
Revenues	35,848	88,724	83,941	316,262
Cost of revenues	31,327	61,943	104,759	249,401
Gross profit	4,521	26,781	(20,818)	66,861
Selling, general and administrative expenses	7,672	7,178	18,977	18,563
Impairment loss			2,072
(Loss) income from operations	(3,151)	19,603	(41,867)	48,298
Other income, net	3,447	1,298	7,037	3,393
Income (loss) before income taxes	296	20,901	(34,830)	51,691
Amortization of purchased intangible assets	61	87	231	262
Depreciation	176	183	517	548
Property, plant and equipment additions	2,659	776	4,533	2,318
Current assets	292,618	347,883	292,618	347,883
Current liabilities	108,474	82,381	108,474	82,381
Goodwill	18,476	20,548	18,476	20,548
Total assets	324,535	376,871	324,535	376,871
Industrial Services
Segment Reporting Information
Revenues	20,143	24,091	80,442	68,577
Cost of revenues	19,159	22,203	72,958	61,889
Gross profit	984	1,888	7,484	6,688
Selling, general and administrative expenses	2,018	1,910	5,959	5,698
(Loss) income from operations	(1,034)	(22)	1,525	990
Other income, net				1,400
Income (loss) before income taxes	(1,034)	(22)	1,525	2,390
Amortization of purchased intangible assets	166	166	497	497
Depreciation	625	616	1,791	1,640
Property, plant and equipment additions	436	1,104	1,487	4,379
Current assets	28,373	30,519	28,373	30,519
Current liabilities	8,744	15,670	8,744	15,670
Goodwill	12,290	13,781	12,290	13,781
Total assets	55,814	60,933	55,814	60,933
Telecom Services
Segment Reporting Information
Revenues	2,415	3,644	6,626	9,656
Cost of revenues	1,928	2,781	5,361	7,513
Gross profit	487	863	1,265	2,143
Selling, general and administrative expenses	485	436	1,535	1,286
(Loss) income from operations	2	427	(270)	857
Income (loss) before income taxes	2	427	(270)	857
Amortization of purchased intangible assets	45		136
Depreciation	97	96	298	267
Property, plant and equipment additions	170	119	277	666
Current assets	2,861	3,964	2,861	3,964
Current liabilities	796	1,075	796	1,075
Total assets	4,370	5,623	4,370	5,623
Other
Segment Reporting Information
Selling, general and administrative expenses	1,960	1,623	5,290	5,615
(Loss) income from operations	(1,960)	(1,623)	(5,290)	(5,615)
Other income, net	131	131	435	328
Income (loss) before income taxes	(1,829)	(1,492)	(4,855)	(5,287)
Depreciation	1	3	4	10
Property, plant and equipment additions		2	11	3
Current assets	82,048	57,126	82,048	57,126
Current liabilities	943	750	943	750
Total assets	87,998	57,342	87,998	57,342
Intercompany Eliminations
Segment Reporting Information
Revenues	$ 1,100	$ 400	$ 2,500	$ 800