SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024 USD ($)	Oct. 31, 2023 USD ($)	Oct. 31, 2024 USD ($) segment	Oct. 31, 2023 USD ($)	Jan. 31, 2024 USD ($)
Segment Reporting Information
Operating segment | segment			1
Revenues	$ 257,008	$ 163,755	$ 641,705	$ 408,779
Cost of revenues	212,681	144,520	548,329	351,578
Gross profit	44,327	19,235	93,376	57,201
Selling, general and administrative expenses	13,995	11,375	37,848	32,467
Income (loss) from operations	30,332	7,860	55,528	24,734
Other income (loss), net	6,646	3,733	17,044	7,222
Income (loss) before income taxes	36,978	11,593	72,572	31,956
Income tax expense	8,968	6,129	18,482	11,616
Net income	28,010	5,464	54,090	20,340
Amortization of intangibles	98	98	293	294
Depreciation	433	489	1,376	1,524
Property, plant and equipment additions	2,547	1,112	5,218	2,143
Current assets	717,141	514,071	717,141	514,071	$ 547,179
Current liabilities	436,164	273,894	436,164	273,894	302,260
Goodwill	28,033	28,033	28,033	28,033	28,033
Total assets	768,864	563,652	768,864	563,652	$ 598,229
Intercompany Eliminations
Segment Reporting Information
Revenues	3,500		4,800
Corporate, Non-Segment [Member]
Segment Reporting Information
Selling, general and administrative expenses	2,976	2,751	8,392	8,197
Income (loss) from operations	(2,976)	(2,751)	(8,392)	(8,197)
Other income (loss), net	1,028	342	2,654	(1,863)
Income (loss) before income taxes	(1,948)	(2,409)	(5,738)	(10,060)
Depreciation		1	2	3
Property, plant and equipment additions	2	1	2	1
Current assets	120,053	71,038	120,053	71,038
Current liabilities	1,635	1,592	1,635	1,592
Total assets	122,191	73,555	122,191	73,555
Power Industry Services | Operating Segments
Segment Reporting Information
Revenues	212,096	121,300	496,122	296,821
Cost of revenues	173,283	107,781	422,508	255,210
Gross profit	38,813	13,519	73,614	41,611
Selling, general and administrative expenses	8,466	6,390	21,786	17,700
Income (loss) from operations	30,347	7,129	51,828	23,911
Other income (loss), net	5,618	3,391	14,386	9,088
Income (loss) before income taxes	35,965	10,520	66,214	32,999
Depreciation	158	137	443	393
Property, plant and equipment additions	2,304	583	4,523	1,120
Current assets	542,558	399,489	542,558	399,489
Current liabilities	411,735	244,662	411,735	244,662
Goodwill	18,476	18,476	18,476	18,476
Total assets	572,828	426,466	572,828	426,466
Industrial Construction Services | Operating Segments
Segment Reporting Information
Revenues	41,337	38,434	134,678	101,497
Cost of revenues	36,757	33,899	117,836	88,537
Gross profit	4,580	4,535	16,842	12,960
Selling, general and administrative expenses	1,848	1,626	5,686	4,532
Income (loss) from operations	2,732	2,909	11,156	8,428
Other income (loss), net	1		2
Income (loss) before income taxes	2,733	2,909	11,158	8,428
Amortization of intangibles	98	98	293	294
Depreciation	166	249	621	813
Property, plant and equipment additions	236	497	509	973
Current assets	50,294	39,843	50,294	39,843
Current liabilities	20,663	25,839	20,663	25,839
Goodwill	9,467	9,467	9,467	9,467
Total assets	67,172	57,112	67,172	57,112
Telecommunications Infrastructure Services | Operating Segments
Segment Reporting Information
Revenues	3,575	4,021	10,905	10,461
Cost of revenues	2,641	2,840	7,985	7,831
Gross profit	934	1,181	2,920	2,630
Selling, general and administrative expenses	705	608	1,984	2,038
Income (loss) from operations	229	573	936	592
Other income (loss), net	(1)		2	(3)
Income (loss) before income taxes	228	573	938	589
Depreciation	109	102	310	315
Property, plant and equipment additions	5	31	184	49
Current assets	4,236	3,701	4,236	3,701
Current liabilities	2,131	1,801	2,131	1,801
Goodwill	90	90	90	90
Total assets	$ 6,673	$ 6,519	$ 6,673	$ 6,519