SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Jan. 31, 2017
Segment Reporting Information
Revenues	$ 230,489	$ 130,348
Cost of revenues	190,393	102,046
GROSS PROFIT	40,096	28,302
Selling, general and administrative expenses	9,489	7,047
INCOME FROM OPERATIONS	30,607	21,255
Other income, net	1,218	37
INCOME BEFORE INCOME TAXES	31,825	21,292
Income tax expense	11,076	7,172
NET INCOME	20,749	14,120
Amortization of intangibles	183	321
Depreciation	572	434
Property, plant and equipment additions	1,863	245
Current assets	643,671	400,116	$ 587,949
Current liabilities	384,679	218,346	350,724
Goodwill	34,913	36,813	34,913
Total assets	709,926	467,979	$ 652,972
Power Services
Segment Reporting Information
Revenues	210,789	108,099
Cost of revenues	173,248	83,698
GROSS PROFIT	37,541	24,401
Selling, general and administrative expenses	5,205	3,234
INCOME FROM OPERATIONS	32,336	21,167
Other income, net	1,169	14
INCOME BEFORE INCOME TAXES	33,505	21,181
Amortization of intangibles	87	147
Depreciation	170	132
Property, plant and equipment additions	12	184
Current assets	522,871	287,474
Current liabilities	372,849	199,538
Goodwill	20,548	22,526
Total assets	552,134	318,248
Industrial Services
Segment Reporting Information
Revenues	16,571	20,410
Cost of revenues	14,741	16,988
GROSS PROFIT	1,830	3,422
Selling, general and administrative expenses	1,645	1,633
INCOME FROM OPERATIONS	185	1,789
INCOME BEFORE INCOME TAXES	185	1,789
Amortization of intangibles	96	174
Depreciation	335	258
Property, plant and equipment additions	1,694	22
Current assets	18,306	23,346
Current liabilities	9,865	16,045
Goodwill	14,365	14,287
Total assets	52,358	57,613
Telecom Services
Segment Reporting Information
Revenues	3,129	1,839
Cost of revenues	2,404	1,360
GROSS PROFIT	725	479
Selling, general and administrative expenses	313	327
INCOME FROM OPERATIONS	412	152
INCOME BEFORE INCOME TAXES	412	152
Depreciation	64	41
Property, plant and equipment additions	155	39
Current assets	4,032	5,502
Current liabilities	1,728	803
Total assets	5,149	6,073
Other
Segment Reporting Information
Selling, general and administrative expenses	2,326	1,853
INCOME FROM OPERATIONS	(2,326)	(1,853)
Other income, net	49	23
INCOME BEFORE INCOME TAXES	(2,277)	(1,830)
Depreciation	3	3
Property, plant and equipment additions	2
Current assets	98,462	83,794
Current liabilities	237	1,960
Total assets	100,285	$ 86,045
Intercompany Eliminations
Segment Reporting Information
Revenues	$ 1,700