SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Segment Reporting Information
Revenues	$ 141,366	$ 230,489
Cost of revenues	125,914	190,393
Gross profit	15,452	40,096
Selling, general and administrative expenses	9,637	9,489
Income (loss) from operations	5,815	30,607
Other income, net	764	1,218
Income (loss) before income taxes	6,579	31,825
Income tax expense	1,737	11,076
Net income	4,842	20,749
Amortization of purchased intangible assets	253	183
Depreciation	771	572
Property, plant and equipment additions	3,691	1,863
Current assets	465,632		$ 485,028
Current liabilities	165,313		183,211
Goodwill	34,329	34,913	34,329
Total assets	525,878	661,357	$ 542,670
Power Services
Segment Reporting Information
Revenues	122,487	210,789
Cost of revenues	108,296	173,248
Gross profit	14,191	37,541
Selling, general and administrative expenses	5,232	5,205
Income (loss) from operations	8,959	32,336
Other income, net	675	1,169
Income (loss) before income taxes	9,634	33,505
Amortization of purchased intangible assets	87	87
Depreciation	176	170
Property, plant and equipment additions	826	12
Current assets	365,569
Current liabilities	147,694
Goodwill	20,548	20,548
Total assets	393,932	506,952
Industrial Services
Segment Reporting Information
Revenues	16,449	16,571
Cost of revenues	15,649	14,741
Gross profit	800	1,830
Selling, general and administrative expenses	1,835	1,645
Income (loss) from operations	(1,035)	185
Income (loss) before income taxes	(1,035)	185
Amortization of purchased intangible assets	166	96
Depreciation	513	335
Property, plant and equipment additions	2,564	1,694
Current assets	23,598
Current liabilities	15,989
Goodwill	13,781	14,365
Total assets	53,698	49,420
Telecom Services
Segment Reporting Information
Revenues	2,430	3,129
Cost of revenues	1,969	2,404
Gross profit	461	725
Selling, general and administrative expenses	462	313
Income (loss) from operations	(1)	412
Income (loss) before income taxes	(1)	412
Depreciation	79	64
Property, plant and equipment additions	300	155
Current assets	3,380
Current liabilities	1,115
Total assets	4,862	4,700
Other
Segment Reporting Information
Selling, general and administrative expenses	2,108	2,326
Income (loss) from operations	(2,108)	(2,326)
Other income, net	89	49
Income (loss) before income taxes	(2,019)	(2,277)
Depreciation	3	3
Property, plant and equipment additions	1	2
Current assets	73,085
Current liabilities	515
Total assets	73,386	100,285
Intercompany Eliminations
Segment Reporting Information
Revenues	$ 100	$ 1,700