SEGMENT REPORTING (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Jan. 31, 2016
Segment Reporting Information
Revenues	$ 130,348	$ 85,488
Cost of revenues	102,046	64,321
Gross profit	28,302	21,167
Selling, general and administrative expenses	7,047	5,540
Income (loss) from operations	21,255	15,627
Other income, net	37	85
Income (loss) before income taxes	21,292	15,712
Income tax expense	7,172	4,861
Net income	14,120	10,851
Amortization of intangibles	321	60
Depreciation	434	119
Fixed asset additions	245	1,207
Current assets	401,134		$ 351,723
Current liabilities	218,353		187,712
Goodwill	36,813	18,476	37,405
Total assets	459,266	399,872	$ 410,902
Power Industry Services
Segment Reporting Information
Revenues	108,099	82,884
Cost of revenues	83,698	62,379
Gross profit	24,401	20,505
Selling, general and administrative expenses	3,234	3,583
Income (loss) from operations	21,167	16,922
Other income, net	14	79
Income (loss) before income taxes	21,181	17,001
Amortization of intangibles	147	60
Depreciation	132	75
Fixed asset additions	184	1,126
Current assets	287,998
Current liabilities	199,538
Goodwill	22,526	18,476
Total assets	315,768	334,355
Telecommunications Infrastructure Services
Segment Reporting Information
Revenues	1,839	2,604
Cost of revenues	1,360	1,942
Gross profit	479	662
Selling, general and administrative expenses	327	304
Income (loss) from operations	152	358
Income (loss) before income taxes	152	358
Depreciation	41	41
Fixed asset additions	39	81
Current assets	5,519
Current liabilities	803
Total assets	6,037	4,424
Industrial Fabrication And Field Services
Segment Reporting Information
Revenues	20,410
Cost of revenues	16,988
Gross profit	3,422
Selling, general and administrative expenses	1,633
Income (loss) from operations	1,789
Income (loss) before income taxes	1,789
Amortization of intangibles	174
Depreciation	258
Fixed asset additions	22
Current assets	24,863
Current liabilities	16,045
Goodwill	14,287
Total assets	48,433
Other
Segment Reporting Information
Selling, general and administrative expenses	1,853	1,653
Income (loss) from operations	(1,853)	(1,653)
Other income, net	23	6
Income (loss) before income taxes	(1,830)	(1,647)
Depreciation	3	3
Current assets	82,754
Current liabilities	1,967
Total assets	$ 89,028	$ 61,093