SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2024 USD ($)	Jul. 31, 2023 USD ($)	Jul. 31, 2024 USD ($) segment	Jul. 31, 2023 USD ($)	Jan. 31, 2024 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 227,015	$ 141,349	$ 384,697	$ 245,024
Cost of revenues	195,910	117,607	335,648	207,058
Gross profit	31,105	23,742	49,049	37,966
Selling, general and administrative expenses	12,428	10,501	23,853	21,092
Income (loss) from operations	18,677	13,241	25,196	16,874
Other income (loss), net	5,604	4,118	10,398	3,489
Income (loss) before income taxes	24,281	17,359	35,594	20,363
Income tax expense	6,083	4,592	9,514	5,487
Net income	18,198	12,767	26,080	14,876
Amortization of intangibles	98	98	195	196
Depreciation	463	488	943	1,035
Property, plant and equipment additions	2,349	386	2,671	1,031
Current assets	674,954	455,132	674,954	455,132	$ 547,179
Current liabilities	415,127	215,606	415,127	215,606	302,260
Goodwill	28,033	28,033	28,033	28,033	28,033
Total assets	726,574	505,708	726,574	505,708	$ 598,229
Intercompany Eliminations
Segment Reporting Information
Revenues	1,400		1,400
Corporate, Non-Segment [Member]
Segment Reporting Information
Selling, general and administrative expenses	2,602	2,732	5,416	5,446
Income (loss) from operations	(2,602)	(2,732)	(5,416)	(5,446)
Other income (loss), net	894	514	1,626	(2,205)
Income (loss) before income taxes	(1,708)	(2,218)	(3,790)	(7,651)
Depreciation	1	1	2	2
Current assets	138,462	86,073	138,462	86,073
Current liabilities	1,502	1,488	1,502	1,488
Total assets	141,381	89,178	141,381	89,178
Power Industry Services | Operating Segments
Segment Reporting Information
Revenues	173,760	105,345	284,026	175,521
Cost of revenues	150,233	87,094	249,225	147,429
Gross profit	23,527	18,251	34,801	28,092
Selling, general and administrative expenses	7,192	5,596	13,320	11,310
Income (loss) from operations	16,335	12,655	21,481	16,782
Other income (loss), net	4,707	3,607	8,768	5,697
Income (loss) before income taxes	21,042	16,262	30,249	22,479
Depreciation	148	128	285	256
Property, plant and equipment additions	1,947	148	2,219	537
Current assets	476,912	319,196	476,912	319,196
Current liabilities	384,477	183,405	384,477	183,405
Goodwill	18,476	18,476	18,476	18,476
Total assets	506,365	346,192	506,365	346,192
Industrial Construction Services | Operating Segments
Segment Reporting Information
Revenues	49,642	32,756	93,341	63,063
Cost of revenues	43,200	28,076	81,079	54,638
Gross profit	6,442	4,680	12,262	8,425
Selling, general and administrative expenses	1,965	1,446	3,838	2,906
Income (loss) from operations	4,477	3,234	8,424	5,519
Other income (loss), net			1
Income (loss) before income taxes	4,477	3,234	8,425	5,519
Amortization of intangibles	98	98	195	196
Depreciation	210	260	455	564
Property, plant and equipment additions	241	220	273	476
Current assets	55,175	45,590	55,175	45,590
Current liabilities	27,817	28,996	27,817	28,996
Goodwill	9,467	9,467	9,467	9,467
Total assets	71,787	63,074	71,787	63,074
Telecommunications Infrastructure Services | Operating Segments
Segment Reporting Information
Revenues	3,613	3,248	7,330	6,440
Cost of revenues	2,477	2,437	5,344	4,991
Gross profit	1,136	811	1,986	1,449
Selling, general and administrative expenses	669	727	1,279	1,430
Income (loss) from operations	467	84	707	19
Other income (loss), net	3	(3)	3	(3)
Income (loss) before income taxes	470	81	710	16
Depreciation	104	99	201	213
Property, plant and equipment additions	161	18	179	18
Current assets	4,405	4,273	4,405	4,273
Current liabilities	1,331	1,717	1,331	1,717
Goodwill	90	90	90	90
Total assets	$ 7,041	$ 7,264	$ 7,041	$ 7,264